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| openstackgerrit | Avishay Traeger proposed openstack/cinder: List manageable volumes and snapshots https://review.openstack.org/285296 | 06:56 |
|---|---|---|
| openstackgerrit | Avishay Traeger proposed openstack/cinder: Map volume/snapshot manage extensions to v3 https://review.openstack.org/307324 | 06:56 |
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| openstackgerrit | Davanum Srinivas (dims) proposed openstack/cinder: [WIP] Testing latest u-c https://review.openstack.org/303766 | 08:10 |
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| openstackgerrit | chandan kumar proposed openstack/cinder: Also package tempest_tests https://review.openstack.org/311715 | 10:23 |
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| openstackgerrit | chandan kumar proposed openstack/cinder: Also package tempest_tests https://review.openstack.org/311715 | 10:39 |
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| openstackgerrit | Tom Barron proposed openstack/cinder: Tests: Fail if oslo.versionedobjects issues Invalid UUID warnings https://review.openstack.org/300189 | 10:57 |
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| openstackgerrit | Merged openstack/cinder: Tests: Fail if oslo.versionedobjects issues Invalid UUID warnings https://review.openstack.org/300189 | 13:38 |
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| anteaya | hello cinder channel | 14:51 |
| anteaya | I know the group has selected a time for your next mid-cycle | 14:52 |
| anteaya | could some kind person add that info to https://wiki.openstack.org/wiki/Sprints | 14:52 |
| anteaya | for the benefit of folks such as myself? | 14:52 |
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| smcginnis | anteaya: Will do, thanks for the reminder. | 14:53 |
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| anteaya | smcginnis: thank you | 14:53 |
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| hemna__ | morning | 15:04 |
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| scottda | hemna morning | 15:06 |
| scottda | smcginnis: I've discovered a problem with getting hotel rooms in Fort Collins the week of the mid-cycle...it seems there's some huge state-wide softball tournament and all rooms are pretty booked. | 15:07 |
| scottda | Not just one hotel, but probably all. We'd likely have to either move the date or move the location. Sorry about that. | 15:08 |
| hemna | whoa | 15:08 |
| anteaya | scottda: whoa | 15:09 |
| anteaya | so what was the backup location, rochester or dublin? | 15:09 |
| scottda | I think it was raleigh? | 15:09 |
| smcginnis | scottda: Ruh roh. | 15:09 |
| smcginnis | anteaya: Second choice was Dublin, followed by Raleigh. | 15:10 |
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| anteaya | can we check for hotel availablity in dublin before switching? | 15:10 |
| smcginnis | I'll see if I can export the survey results and publish them. | 15:10 |
| smcginnis | Simon also pointed out Red Hat summit was that week, so we could also consider moving it to a different time if that's better. | 15:11 |
| Swanson | Added failover_host failback to the Dell SC driver while all's y'all were out gallivanting around Texas. If anyone wants to take a look ... https://review.openstack.org/#/c/310064/ | 15:11 |
| scottda | I'm told a different week would be fine, just this week has 100's of softball teams coming for this thing. | 15:11 |
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| scottda | smcginnis: What was 2nd choice week? | 15:12 |
| smcginnis | scottda: Just in Fort Collins, or will it be that whole area? | 15:12 |
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| scottda | smcginnis: It will be the whole area. State-wide, apparently | 15:12 |
| smcginnis | scottda: I think R-10 was the next week, right after Nova's/ | 15:12 |
| anteaya | ew | 15:12 |
| diablo_rojo | Jul 25-29 | 15:12 |
| anteaya | that wouldn't work for me | 15:12 |
| anteaya | but in any case, let me know what you decide | 15:13 |
| anteaya | scottda: thanks for checking the hotels | 15:13 |
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| smcginnis | scottda: Yeah, thanks for checking so quick. If we would have found out later it would have been painful rescheduling flights. | 15:14 |
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| scottda | Jul25-29 would work for the hotel (12 rooms is what I asked for) | 15:15 |
| smcginnis | I've sent out a notice to the mailing list to hopefully stop anyone before they book. | 15:15 |
| smcginnis | Sorry if anyone has already jumped on that. | 15:15 |
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| smcginnis | scottda: OK, great to know. | 15:15 |
| diablo_rojo | So we are still doing Ft. Collins, but for R10? | 15:15 |
| smcginnis | diablo_rojo: TBD | 15:16 |
| smcginnis | R10 or different location. | 15:16 |
| scottda | smcginnis: They said that deal would not disappear today, but we should act as fast as possible. | 15:16 |
| smcginnis | scottda: Pressure sales! :) | 15:16 |
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| anteaya | scottda: you can book and then cancel | 15:16 |
| anteaya | who is the dublin contact? | 15:16 |
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| scottda | anteaya: DuncanT is, but he's not really local anymore. | 15:17 |
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| scottda | anteaya: My team is in Galway, and the Dublin location was going to be HPE, so I could help with that.... | 15:17 |
| diablo_rojo | anteaya: And he's on vacation in Austin still | 15:17 |
| anteaya | yes that is true | 15:17 |
| anteaya | diablo_rojo: ah | 15:17 |
| diablo_rojo | shooting more guns today I think lol | 15:18 |
| anteaya | scottda: could you take a quick peek at hotels in dublin for the last week of june? | 15:18 |
| anteaya | scottda: just to see if they also are have a softball tournament the same week | 15:18 |
| scottda | anteaya: I'll query some Irish locals as to holidays... | 15:18 |
| anteaya | diablo_rojo: apparently that is what you do in the states | 15:18 |
| anteaya | scottda: thank you | 15:18 |
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| diablo_rojo | anteaya: I guess so; Thursday wasn't enough for him. | 15:19 |
| anteaya | diablo_rojo: I'm interested in Duncan's dancing, not so much his other hobbies | 15:19 |
| scottda | It's a bank holiday in Ireland today, so might take >24 hours for details | 15:20 |
| anteaya | scottda: understood | 15:21 |
| anteaya | scottda: thank you | 15:21 |
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| ildikov | scottda: jgriffith hemna mriedem1: hi | 15:29 |
| scottda | ildikov: HI | 15:29 |
| ildikov | I hope everyone had a safe trip back home :) | 15:29 |
| scottda | And you as well. | 15:29 |
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| ildikov | I wanted to ask when we could schedule the Google Hangout we planned | 15:30 |
| ildikov | scottda: yeap, it was quite smooth, thanks, I'm only ruined by the jet lag :) | 15:30 |
| hemna | hey | 15:30 |
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| ildikov | so I thought I might try with Wednesday our regular meeting day, but with a slightly earlier slot | 15:31 |
| mriedem1 | thursday? | 15:31 |
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| scottda | ildikov: I've a conflict Wed UTC 15:00 -> and most days I conflict at UTC 13:00 , other than that pretty flexible | 15:31 |
| ildikov | mriedem: Thursday works for me as well | 15:32 |
| smcginnis | I'm fairly flexible this week. | 15:32 |
| scottda | Thursday works for me | 15:33 |
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| ildikov | ok, Thursday is fine for me as well this week from 1600UTC or from 1700UTC in general | 15:34 |
| ildikov | hemna: jgriffith: ? | 15:34 |
| scottda | hemna: Those time's ildikov is proposing are Thurs 0900 -> PDT (since you are UTC -7:00) | 15:35 |
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| hemna | this thursday at 9am? | 15:36 |
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| ildikov | if we want this as a series than more 10am PDT, but this week I can make it at 9amPDT, I have other meetings before | 15:37 |
| hemna | I'm fine with 9am | 15:37 |
| ildikov | hemna: cool | 15:37 |
| hemna | I'm just updating my resume and stuffs like that at this point anyway | 15:37 |
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| anteaya | hemna: go you \o/ | 15:38 |
| ildikov | hemna: I understand, although I hope you're available at least for answering questions as well | 15:38 |
| hemna | absolutely | 15:38 |
| ildikov | hemna: I will not force you to take action points, or at least not yet :) | 15:39 |
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| ildikov | mriedem: it seems that who's around currently is available at 1600UTC, does it look ok for you as well? | 15:41 |
| ildikov | mriedem: on Thursday | 15:41 |
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| scottda | hemna: Is your solution for When-to-call-Brick-volume_detach that uses existing Nova info written down anywhere? | 15:44 |
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| scottda | hemna: I'm not sure why we haven't considered this as an alternative, but it seems to amount of changes and risk. | 15:44 |
| jgriffith | hemna: smcginnis I'm open I think | 15:45 |
| scottda | "seems to amount" -> "seems to be the solution with the least amount" | 15:45 |
| hemna | written down? I may have mentioned the idea in the ML a while back | 15:46 |
| hemna | at this point though, from our discussion on Friday with the Nova team, they just seem over the whole idea of Multi-attach all together. | 15:46 |
| hemna | the virtual volume idea seems like a nightmare for users, IMHO | 15:47 |
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| hemna | and horizon for that matter. | 15:47 |
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| smcginnis | hemna: +1 | 15:48 |
| hemna | would it make sense | 15:48 |
| scottda | hemna: Yeah, none of that stuff is needed, nor do I think it has anything to do with multi-attach. | 15:48 |
| smcginnis | I can't come up with a visualization for that that wouldn't confuse the hell out of end users. | 15:48 |
| hemna | to add a new API into os-brick that handles the detach issue? | 15:48 |
| smcginnis | Much less command line semantics. | 15:48 |
| scottda | hemna: But your simple algorithm solves all problems, as far as I can see. | 15:48 |
| ildikov | jgriffith: do you mean that you're available for the proposed slot this Thursday? | 15:48 |
| scottda | hemna: It was to use Nova's info on whether a volume had multiple attaches to the same host or not, and use that to determine when to call os-brick to disconnect. | 15:49 |
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| ildikov | hemna: scottda: didn't we say that we can count the number of attachments on the same host and if we have a single target call disconnect_volume only for the last attachment on the host? | 15:49 |
| hemna | if each attachment entry had the host as well as the instance_uuid, I think we can determine the detach | 15:49 |
| jgriffith | ildikov: correct | 15:49 |
| hemna | w/o any nova info | 15:50 |
| ildikov | jgriffith: cool, tnx, I will send out a Hangout link with the proposed time to the ML then | 15:50 |
| scottda | hemna: Or, it could be determined by Nova now, without any changes other than a method to figure out whether there are >1 or =1 attachments to the Nova host for this volume, at least if I understood your proposal for this. | 15:51 |
| hemna | sure | 15:51 |
| ildikov | scottda: theoretically Nova should be able to figure out when to call disconnect | 15:51 |
| scottda | hemna: So, from a pragmatist standpoint, I'd think we'd be better off coding up that algorithm and seeing what people think. It means no changes to the API, no need to check microversion, no waiting for anything to merge in Cinder, just ~20 lines of code in Nova. | 15:52 |
| ildikov | scottda: except that we still need to know that the driver shares the connection or exports new target each and every time | 15:52 |
| hemna | the only reason I suggested a new os-brick API, is to eliminate the need for nova changes, other than calling the new API | 15:52 |
| hemna | as they seem very resisitant to change | 15:52 |
| scottda | But Nova would need to change to call this new Cinder API, and add support for checking Cinder microversions. | 15:53 |
| hemna | os-brick API | 15:53 |
| hemna | not Cinder | 15:53 |
| hemna | have cinder save the host in the attachment entry | 15:53 |
| ildikov | hemna: what would be needed in brick to make it possible? | 15:54 |
| hemna | then have nova pass the volume attachments at os.brick.connector.disconnect_volume() time. | 15:54 |
| scottda | ildikov: I thought hemna 's solution would allow Nova to calculate whether there driver exported a new target each time with existing info... | 15:54 |
| hemna | nova wouldn't have to do anything then, I thinks | 15:54 |
| hemna | I can try and code it up and put a WIP up | 15:54 |
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| hemna | it might make more sense than my feeble attempt at explaining it. | 15:54 |
| ildikov | scottda: if that means calling initialize_connection at detach time I don't like that | 15:55 |
| scottda | hemna: That'd be great. Or even some pseudo-code to help us discuss. | 15:55 |
| hemna | I think we should code up a POC for the removal of initialize_connection at detach time as well | 15:55 |
| ildikov | hemna: scottda: yeap that might help as I think I have another proposal in mind than what you're discussing at the moment | 15:55 |
| hemna | I think that's a bug IMHO | 15:55 |
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| ildikov | hemna: for live migration you mean? | 15:56 |
| hemna | ildikov, yes | 15:56 |
| ildikov | hemna: cool, I agree that's better to fix that in Nova | 15:56 |
| scottda | But live migration problem is separate from multi-attach. I think it's best to keep them separate . | 15:56 |
| hemna | yah | 15:56 |
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| hemna | well it is separate, but it causes issues with multi-attach solutions as well | 15:57 |
| scottda | All we need for multi-attach is to know when Nova must call os-brick to detach the volume from the physical host, IIUC | 15:57 |
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| hemna | jgriffith's POC patch would have worked if we eliminate the initialize_connection call at detach time | 15:57 |
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| ildikov | scottda: cleaning up live migration helps the multi-attach case as well, otherwise you're right it is a separate issue | 15:58 |
| scottda | hemna: One day a few weeks back, you discussed an algorithm here in IRC that would allow Nova to loop through info (from BDM? or DB call to something like get_volume_by_host?) that could make the determination soley on this existing info, I think... | 15:58 |
| hemna | scottda, yah that would work | 15:59 |
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| hemna | I'm just thinking of other ways | 15:59 |
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| scottda | So that seems like a simple solution that might have a chance of getting in. Other solutions start to grow in complexity, and I think that means they are much less likely to get merged. | 15:59 |
| hemna | the one thing about the virtual volume thing that was nice, is that nova didn't care and wouldn't need to care about single or multi-attach | 16:00 |
| hemna | it just worked | 16:00 |
| scottda | There are many ways of fixing this. But that is part of the problem :) | 16:00 |
| hemna | maybe there is another way to do that behind the scenes/fake it. | 16:00 |
| scottda | hemna: Yeah, maybe. Using some new column in Cinder DB for 2nd and subsequent attaches that map to the original volume, or something like that. | 16:01 |
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| ildikov | I understood the virtual volume thing like we ask the user to create the attachment_id first and then pass it at attach/detach time | 16:02 |
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| scottda | That virtual volume thing is such a departure from the existing user-facing workflow that it's pretty much never going to happen. | 16:03 |
| scottda | If we did something that was invisible to the user, it might be viable. | 16:03 |
| hemna | scottda, yah | 16:03 |
| hemna | that's what I'm trying to come up with | 16:03 |
| ildikov | scottda: yeah, the more I think about it the less realistic it looks like | 16:03 |
| hemna | maybe reserve returns a new volume id | 16:04 |
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| hemna | and that volume id is a hidden virtual volume | 16:04 |
| ildikov | scottda: +1 for invisible solution | 16:04 |
| hemna | then nova just uses that volume id for everything else | 16:04 |
| hemna | feels hackish | 16:04 |
| hemna | and I'm sure other places in nova will have to change to accommodate it | 16:05 |
| hemna | how to change nova without changing nova....... | 16:05 |
| smcginnis | Hah | 16:05 |
| smcginnis | Full survey results: https://docs.google.com/document/d/1DT2Gj64efBDIvgG2j1W3jBw3u5Zs2btsWvQQOhn-j1g/edit?usp=sharing | 16:06 |
| smcginnis | No easy way to export info from SurveyMonkey without "Premium". | 16:06 |
| scottda | hemna: I'm vague on details, but it seems we should be able to do something with Cinder DB to track 2nd+ attachments of the same volume, and then use that to deal with detach scenarios on the Cinder side. Maybe requires a new multiattached table, or something... | 16:07 |
| hemna | scottda, well, we already track N attachments per volume. | 16:07 |
| hemna | we have a volume_attachment table | 16:08 |
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| hemna | that has an entry for every time a volume is attached to an instance_uuid and/or host | 16:08 |
| hemna | and what state it's in | 16:08 |
| scottda | So, we effectively have a source for reference counting. | 16:08 |
| hemna | standard normalized table | 16:08 |
| hemna | yes | 16:08 |
| hemna | that's why if the host was populated in there, we would know when to detach | 16:08 |
| openstackgerrit | Kendall Nelson proposed openstack/cinder-specs: Dynamic Reconfiguration https://review.openstack.org/286234 | 16:09 |
| hemna | Nova's main objection to multi-attach is the idea that nova has to manage volume state | 16:09 |
| hemna | due to knowing when it can do an attach for a volume or not, and what states are allowed | 16:09 |
| hemna | in-use -> attaching -> in-use | 16:09 |
| hemna | in-use -> detaching -> in-use | 16:10 |
| hemna | in-use -> detaching -> available | 16:10 |
| scottda | Nova will always need to know about multi-attach to put the no_cache flag in the xml. This is for any clustered file system to do proper flushing. | 16:10 |
| hemna | sure | 16:10 |
| hemna | that's easy AFAIK | 16:10 |
| hemna | the volume object has the multi-attach flag on it | 16:11 |
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| ildikov | scottda: I have a check for that in my current code on review: https://review.openstack.org/#/c/267587/22/nova/virt/libvirt/volume/volume.py | 16:13 |
| scottda | Nova always has managed volume state, so there's nothing new with multi-attach. IF Cinder moved the state changes in os-reserve to the path of initialize_connection, we could test-and-set the state there, and just return exception or HTTP error is state was incorrect. That entire call to reserve could go away, as could most of the state management. | 16:14 |
| hemna | I'm not sure what the objection is to the state stuff really | 16:14 |
| hemna | the nova API calls check_attach() directly | 16:14 |
| hemna | which it should | 16:14 |
| ildikov | scottda: I know it's slightly arguable where the info is coming from but that's just an implementation detail by the end of the day | 16:14 |
| scottda | We could make state stuff go away, but that's changing the entire API. I started down this path with a spec... | 16:14 |
| hemna | that should do all the checking and failing if need be | 16:14 |
| ildikov | hemna: I added the changes for that in check_attach in the already existing code it's really not a big change | 16:15 |
| hemna | ildikov, yah. I think I added changes there in my first few attempts as well | 16:15 |
| ildikov | hemna: the only thing is that if you try to use it for swap volume you recognise that the Nova API is slightly inconsistent | 16:15 |
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| scottda | Yeah, everything is good for multi-attach, except for Nova knowing when to call os-brick. Other stuff is in or ready for patches to be merged. | 16:16 |
| hemna | so... | 16:17 |
| hemna | the problem with the nova side is that I think it introduces races | 16:17 |
| hemna | https://github.com/openstack/nova/blob/master/nova/volume/cinder.py#L324 | 16:17 |
| hemna | I think that code should be in Cinder IMHO | 16:18 |
| hemna | and part of reserve | 16:18 |
| scottda | Yeah, that race is already there... | 16:18 |
| hemna | scottda, I think this is one of the things we discussed with jgriffith in Ft. Collins a year ago | 16:19 |
| scottda | hemna: Yes, and I've written a couple versions of specs to fix this... | 16:19 |
| hemna | If nova could simply call reserve | 16:19 |
| hemna | done | 16:19 |
| hemna | reserve would pass/fail | 16:19 |
| ildikov | you mean skip further checks in Nova? | 16:19 |
| hemna | Cinder should be the source of truth of if an action can be take on a volume or not | 16:19 |
| hemna | a user of the cinder API shouldn't ever have to be doing this stuff IMHO | 16:20 |
| scottda | Or Nova should just call cinder.smart_attach() , which sets state to attaching or fails, and then proceeds with intitialize_connection, etc. | 16:20 |
| scottda | Out-of-date spec: https://review.openstack.org/267715 | 16:20 |
| hemna | The very first thing that reserve should do, is to put the volume in 'ing' state, then do the checks if it can do an attach. if it can't, set the volume back to the previous state, and then fail the reserve. | 16:21 |
| hemna | if it can attach, then volume is in 'attaching' and return true. | 16:21 |
| hemna | nova continues | 16:21 |
| hemna | this can be done for both single or multi | 16:21 |
| hemna | and nova simply doesn't care at all. | 16:21 |
| hemna | the check_attach and check_detach shouldn't be in Nova IMHO | 16:21 |
| hemna | re: state checking/management | 16:22 |
| hemna | that's Cinder's job really. | 16:22 |
| scottda | hemna: Agreed | 16:22 |
| hemna | that would accomplish the same thing that dan wanted | 16:22 |
| hemna | re: nova doesn't want/need to deal with cinder volume state management | 16:23 |
| ildikov | TBH honest I've never really understood the magic with the different kinds of states checking in Nova | 16:23 |
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| scottda | Worse still, Nova checks state before calling reserve , and state could change in between | 16:23 |
| ildikov | hemna: +1 | 16:23 |
| hemna | scottda, exactly, that's the race condition I was mentioning earlier | 16:23 |
| hemna | this seems like a 'bug' | 16:23 |
| scottda | hemna: Yes, and I think we(you) tried to fix as a bug... | 16:23 |
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| hemna | we can microversion this change | 16:24 |
| ildikov | hemna: scottda: do you know where this state check in Nova originates from? | 16:24 |
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| scottda | hemna: Just but the call to reserve() into a try: block, and get rid of Nova state checks altogether. | 16:24 |
| hemna | and if we are less than the microversion change, then nova doesn't support multi-attach and it just does what it does today. | 16:24 |
| scottda | ildikov: I think from the nova api call to volume-attach | 16:24 |
| hemna | otherwise, the state checks live in reserve | 16:24 |
| hemna | on cinder side. | 16:24 |
| ildikov | scottda: I'm happy to do that part if we can agree on this on Thursday | 16:24 |
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| scottda | ildikov: But is this part of multi-attach or part of cleaning up the nova-cinder API? | 16:25 |
| ildikov | scottda: hmm, ok, I asked to see whther there's some more reason behind than history, but I would guess no | 16:25 |
| hemna | scottda, I think this is 2 birds w/ 1 stone | 16:25 |
| hemna | we fix a race condition with nova -> Cinder | 16:25 |
| hemna | and it allows multi-attach | 16:25 |
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| hemna | w/o Nova knowing it. | 16:25 |
| ildikov | scottda: I would do it as part of a clean up especially if you have a race condition bug reported for it | 16:26 |
| hemna | and the other part | 16:26 |
| hemna | is simple | 16:26 |
| scottda | hemna: It does not solve the "when to call os-brick to detach" issue, unless I'm missing something. | 16:26 |
| hemna | nova checks the multi-attach flag on the volume object | 16:26 |
| hemna | and sets the cache off | 16:26 |
| hemna | and at detach, we can do 1 of 2 things | 16:26 |
| ildikov | scottda: and as hemna says then move forward with multi-attach just because we can, same for fixing live migration | 16:26 |
| hemna | have nova do the work of determining if it should call os-brick.disconnect_volume | 16:26 |
| hemna | or change the brick API | 16:26 |
| hemna | and nova just passes the attachments into it. | 16:27 |
| hemna | small changes really. | 16:27 |
| hemna | there, we just cured cancer. | 16:28 |
| hemna | next..... | 16:28 |
| hemna | dunno | 16:31 |
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| hemna | want me to write up a spec ? | 16:31 |
| hemna | or just hack some code? | 16:31 |
| hemna | hacking code is more fun | 16:31 |
| ildikov | hemna: hacking code for which part? | 16:32 |
| hemna | the cinder changes | 16:32 |
| hemna | changing reserve | 16:32 |
| hemna | scrum....brb. | 16:33 |
| ildikov | hemna: as we told that that's a kinda race bug, I think you can hack code, I can do the Nova side and if it turns out not to be a bug fix, but still working we can cover it with a spec | 16:34 |
| ildikov | the only thing we need to keep in mind is that we need an updated and accepted spec for multi-attach in Nova, for which I have a document uploaded, but it does not cover the current state as we're not in an agreement yet | 16:35 |
| scottda | ildikov: hemna Race bug(s): https://bugs.launchpad.net/nova/+bug/1499012 | 16:35 |
| openstack | Launchpad bug 1499012 in OpenStack Compute (nova) "Nova and Cinder get desynced on volume attachments" [Undecided,Confirmed] | 16:35 |
| ildikov | do you see any other changes on Nova side that would require a spec rather than a bug report? | 16:35 |
| scottda | https://bugs.launchpad.net/nova/+bug/1457359 | 16:35 |
| openstack | Launchpad bug 1457359 in OpenStack Compute (nova) "race condition in quick detach/attach to the same volume and vm" [Undecided,Expired] | 16:36 |
| ildikov | scottda: cool, thanks | 16:36 |
| ildikov | scottda: I guess we can link them to Cinder as well | 16:36 |
| scottda | ildikov: Note that they are not newly filed. The issue has been around, and keeps popping up.... | 16:36 |
| scottda | maybe also this: https://bugs.launchpad.net/nova/+bug/1335889 | 16:37 |
| openstack | Launchpad bug 1335889 in OpenStack Compute (nova) "Race condition in quickly attaching / deleting volumes" [High,Confirmed] - Assigned to zhaolihui (zhaolh) | 16:37 |
| ildikov | scottda: having three bug reports to the same issue looks like a good reason to finally fix it | 16:39 |
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| scottda | ildikov: I cannot guarantee they all have this same root cause, but at least 1 of them does. | 16:41 |
| ildikov | scottda: the old one describes the issue of volumes left behind in attached state after deleting VMS | 16:42 |
| ildikov | scottda: I cannot tell at this point if we change how reserve behaves it will help with having this situation way less than today | 16:43 |
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| ildikov | scottda: the middle one looks more like a Nova Cells issue, but I'm not an expert on how that works TBH | 16:53 |
| openstackgerrit | chandan kumar proposed openstack/cinder: rename tempest_tests to cinder_tempest_plugin https://review.openstack.org/311715 | 16:59 |
| ildikov | scottda: anyway, it should be fine for documenting the attempt of trying to fix reserve and remove check_attach and check_detach from Nova | 16:59 |
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| ildikov | scottda: I think someone maybe Nikola was pretty much against changing check_attach during the last cycle due to plans for removal | 17:00 |
| ildikov | scottda: but let's see how it goes this time | 17:00 |
| cFouts | st0rmyPassAle | 17:01 |
| cFouts | well there goes that one | 17:02 |
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| Swanson | go with st1myPassAle | 17:09 |
| cFouts | :) | 17:09 |
| hemna | back | 17:15 |
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| jgriffith | hemna: scottda I'm sort of confused | 17:48 |
| jgriffith | hemna: scottda I can fix that anyway, just by adding that single call "safe_to_disconnect" | 17:49 |
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| jgriffith | hemna: scottda I can't figure out how to make the "virt" volume idea work without being a train wreck for the user | 17:50 |
| hemna | jgriffith, yah same here. I don't care for the virtual volume idea either. | 17:51 |
| scottda | jgriffith: I agree. The virt volume thing is a no-go. | 17:51 |
| hemna | it's a mess for users. | 17:51 |
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| hemna | I think I have a solution | 17:51 |
| hemna | just have to hack it up | 17:51 |
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| smcginnis | Awesome if we can start talking around (semi-)working code, other than abstract concepts. | 17:52 |
| jgriffith | hemna: ok, well let me know if you're doing it or not so I don't waste time on what I had going | 17:52 |
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| jgriffith | I still don't understand why this is so hard. I have a solution that works, and it's relatively small code change with no changes to existing API's but whatevs | 17:53 |
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| smcginnis | jgriffith: Was that the patch you had out there? | 17:55 |
| hemna | there are a lot of moving parts on the Nova side | 17:56 |
| hemna | I'd like to tidy all of that garbage up | 17:56 |
| smcginnis | jgriffith: Was looking for that, but the only open ones I see are for SolidFire. | 17:56 |
| jgriffith | smcginnis: a mix of that and what I proposed in the ehterpad on the flight home :) | 17:56 |
| hemna | which is why I mentioned working on removing the initialize_connection call at detach time | 17:56 |
| smcginnis | hemna: That's definitely a plus. | 17:56 |
| hemna | anyway, I have nothing to do other than looking for a job.... | 17:56 |
| hemna | so, hacking code is more fun | 17:57 |
| jgriffith | hemna: sure, but that's the problem and why I abandoned | 17:57 |
| jgriffith | hemna: I think that trying to fix it all in one mega patch is a really bad idea | 17:57 |
| hemna | it's a multi patch process IMHO | 17:57 |
| jgriffith | hemna: as opposed to planning for it and designing it in as multiple small patches | 17:57 |
| jgriffith | cool | 17:57 |
| hemna | 2 of which I think are 'bugs' | 17:57 |
| hemna | 1) removing initialize_connection at detach time in Nova | 17:58 |
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| ildikov | jgriffith: definitely +1 for the step by step approach | 17:58 |
| jgriffith | No sense in all of us running off doing our own thing, I'll just let you fix it up since you're working up code too | 17:58 |
| hemna | 2) fixing the race condition in Nova during attach (volume fetch, check_attach, reserve) | 17:58 |
| jgriffith | I was happy enough to work on it but now that there seems to be multiple side efforts I don't want to just cause confusion | 17:59 |
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| ildikov | jgriffith: it is also easier to share the work on this if we can do it in smaller patches, we just need to agree on the steps IMHO | 17:59 |
| hemna | ildikov, +1 | 17:59 |
| hemna | fwiw, even the Nova guys couldn't agree on how to 'fix' the initialize_connection issue | 18:00 |
| hemna | so, I think at this point, put up some code | 18:00 |
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| ildikov | hemna: there are a few bug reports that are more or less related to that race condition, so that should be enough to do it as a bug fix and a prep for multi-attach at the same time | 18:00 |
| hemna | sweet | 18:00 |
| ildikov | the only thing I would like to see clearly is that which change we need a Nova spec for and/or what we need to capture in the multi-attach one | 18:02 |
| ildikov | as currently I don't have an approved one for Newton, so we should figure that out before the deadline | 18:02 |
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| ildikov | I hope we can check hemna's diagrams on the Hangout this week and we can also have a cleaner picture what is that we really need to fix and after that we can go and have code up for review | 18:03 |
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| ildikov | but personally myself I could use I could use a big picture as I felt that we went down to a few rabbit holes by concentrating particular code snippets | 18:04 |
| ildikov | anyway, my 2 cents :) | 18:04 |
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| scottda | ildikov: +1 to big picture. | 18:06 |
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| nikeshm | smcginnis: hi | 18:29 |
| smcginnis | nikeshm: Hey! | 18:30 |
| nikeshm | registered some bps, if you get time, please look https://blueprints.launchpad.net/cinder/+spec/kaminario-iscsi-cinder-driver | 18:31 |
| nikeshm | https://blueprints.launchpad.net/cinder/+spec/kaminario-fc-cinder-driver | 18:31 |
| smcginnis | nikeshm: Will do, thanks. | 18:31 |
| nikeshm | smcginnis: thanks | 18:31 |
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| mtanino | smcginnis: hi, | 18:47 |
| smcginnis | mtanino: Hi | 18:47 |
| mtanino | smcginnis: May I have few min to talk about the bug/1531711 ? | 18:48 |
| mtanino | https://bugs.launchpad.net/cinder/+bug/1531711 | 18:48 |
| openstack | Launchpad bug 1531711 in Cinder "Create Volume from image bug (iscsi)" [Medium,New] | 18:48 |
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| smcginnis | mtanino: Sure, I have to review that bug report again. Sounds familiar, but don't know any details. | 18:49 |
| smcginnis | Ah, OK, the qemu-image convert stuff. | 18:49 |
| mtanino | smcginnis: About this bug, we talked a little at meetup on Friday. | 18:50 |
| smcginnis | mtanino: I forget exactly where we ended up there. | 18:51 |
| mtanino | smcginnis: The problem is that qemu-img command causes error. | 18:52 |
| smcginnis | mtanino: Wasn't it to retry without the flag? | 18:52 |
| raunak | yes, I would like to know the same. Eric had some suggestions | 18:52 |
| mtanino | smcginnis: Based on the discussion with eharney, we seems root cause of this bug is not qemu-img command. | 18:53 |
| mtanino | smcginnis: raunak Please see Eric's comment #18 on the bug. | 18:53 |
| smcginnis | mtanino: Right, something with the specific backends? | 18:53 |
| mtanino | smcginnis: I guess so. So in that case, can we get help from these driver vendors? | 18:53 |
| mtanino | smcginnis: nimble and huawei, I think | 18:54 |
| smcginnis | mtanino: Yeah, I think they should figure out why it's failing for them when it works fine for others. | 18:54 |
| cFouts | scottda: not sure if Cao is going to ask you but this could probably use a review from you: https://review.openstack.org/#/c/309878/4 | 18:54 |
| mtanino | smcginnis: Should I ask them directly or any good idea? | 18:55 |
| mtanino | or at weekly meeting? | 18:55 |
| raunak | ok. Need to figure out the race with device setup but we think it may be something to do with sector size. | 18:55 |
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| mtanino | raunak: sector size? | 18:55 |
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| raunak | from the block level driver. The default sector size on the block device | 18:56 |
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| mtanino | raunak: If the sector size causes problem, it always fail on their CI environment, I think. | 18:56 |
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| jgriffith | ildikov: yes, you're definitely right | 19:17 |
| ildikov | jgriffith: :) | 19:19 |
| ildikov | jgriffith: hopefully the Hangout call will help to sort this out | 19:19 |
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| openstackgerrit | Colleen Murphy proposed openstack/cinder: Mark the v1 API as deprecated https://review.openstack.org/309652 | 20:28 |
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| hemna | https://review.openstack.org/#/c/275943/ | 21:13 |
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| hemna | could use some love | 21:13 |
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| openstackgerrit | Nate Potter proposed openstack/python-cinderclient: Implement cinder backend-usage command https://review.openstack.org/301445 | 22:31 |
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| openstackgerrit | Nate Potter proposed openstack/cinder: Implement backend usage reporting https://review.openstack.org/301444 | 23:28 |
| openstackgerrit | Nate Potter proposed openstack/python-cinderclient: Implement cinder backend-usage command https://review.openstack.org/301445 | 23:28 |
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