Wednesday, 2019-03-06

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ondrejmeHow could I remove block storage backend from cinder and also from database in Kolla?07:36
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whoami-rajatondrejme: you can remove the entry of backend from cinder.conf and restart the cinder services (also delete the associated volume type). For kolla database you can directly go to database (mysql) and remove the entry but that's not recommended. you can ask for the same in kolla channel.07:41
openstackgerritAbhishek Kekane proposed openstack/cinder-specs master: Support multiple backend of Glance
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ondrejmewhoami-rajat: so the only thing needed is to delete volumes, volume type and restart cinder services?07:49
ondrejmewhoami-rajat: no need to work with database?07:49
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avishayHi all, in our tests (running Ocata) we are seeing CleanableInUse errors sporadically in create_volume and create_snapshot08:13
avishayI saw a few bugs such as this one:
openstackLaunchpad bug 1712272 in Cinder "cinder get worker failed " [Undecided,Invalid] - Assigned to wlfightup (wlfightup)08:13
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avishay@geguileo wrote there that it is caused by an old version of pymysql, but we are running 0.7.9 and I verified that it contains the referenced fix08:14
avishay(Running one instance of cinder-volume)08:15
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openstackgerritSilvan Kaiser proposed openstack/cinder master: Always run chmod privileged in remotefs drivers
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whoami-rajatondrejme:  no, the important part is to delete the entry in cinder.conf08:54
whoami-rajatsomething like this08:54
whoami-rajatondrejme: deleting volumes and volume types related to that backend will automatically wipe out entries in database.08:54
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openstackgerritRajat Dhasmana proposed openstack/python-cinderclient master: Correct the 'get resource' behavior for non-admin user
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raghavendrat I have replied to reviewers comments. Not sure if I was able to convince with my explanation. Waiting for response from core reviewers so that we can logically conclude. If any core reviewer is available, appreciate if you can look and respond.13:12
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openstackgerritsahid proposed openstack/os-brick master: multipathd: fix support for find_multipaths set to yes
openstackgerritsahid proposed openstack/os-brick master: multipath: add debug messages of connection threads
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whoami-rajatraghavendrat: Hey, I think eharney and hemna  had queries regarding your patch. It would be better if you ask them.13:43
openstackgerritMerged openstack/cinder stable/queens: Fix multiattach set to false after retype
raghavendratThanks Rajat. I am waiting for eharney and hemna.13:48
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whoami-rajatraghavendrat: you can discuss it here too :)13:56
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openstackgerritjacky06 proposed openstack/python-cinderclient master: Update hacking version
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openstackgerritEric Harney proposed openstack/cinder master: Revert "Use native python truncate for privsep"
openstackgerritEric Harney proposed openstack/cinder master: Revert "Remove truncate from rootwrap filters"
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openstackgerritMatthew Booth proposed openstack/cinder master: DNM: Getting extra logs for a volume type delete race
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hemnaso whoami-rajat fwiw, we have a customer that's running into problems with the 3PAR driver related to standing up a lot of VMs (100) and creating volumes from snaps17:02
hemnabecause by default the 3PAR driver creates clones for every volume from snap operation17:02
hemnawhich is why I hated that idea from the beginning17:03
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hemnait's crazy fast to create a vol from snap in 3PAR17:03
hemnabut cloning is very slow17:03
hemnathe problem with vols from snaps is that you can't delete the snap, while those volumes exist (dependency)17:03
hemnabut I never understood why that was a problem from cinder's perspective17:04
whoami-rajathemna:  ok.17:05
hemnaand the main usecase is to create a lot of new vms at once17:05
hemnawhich means vols from snaps17:05
hemnaand doing a convert to base on every vol from snap is....s l o w17:05
hemnathen you run into ssh connection issues17:06
hemnaand lots of stuff stops working17:06
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hemnaso, that's why I think the default in that new patch should be set to False.17:06
hemnameaning don't convert to base by default.17:06
hemnaand if you REALLY want to have a base volume, then you can create a new vol type and set that new attribute in there.17:07
hemnaour customer wants to create 100 140G volumes from snaps17:08
hemnathat's a lot of bits to copy (for convert_to_base_volume)17:08
hemnait looks like eharney disagrees though17:09
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openstackgerritWalter A. Boring IV (hemna) proposed openstack/cinder master: Add get_driver_options method
whoami-rajathemna: so if we create a volume type with convert_to_base as False and use it instead to create volumes. what problems do we face in this case?17:13
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angela-ssmcginnis, jungleboyj: Hi Sean, Jay, could you take a look at this cherry pick for Pike? Thanks!
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hemnathe problem with not creating a base volume, is one of dependency17:17
hemnayou can't delete the snapshot17:18
hemnauntil all of the volumes from that snap have either been deleted or made into a base volume.17:18
hemnaIMHO I think that's a better tradeoff17:18
hemnaas then you can get the 3PAR to act more cloud like.17:18
hemnasuch as being able to create 100 volumes very quickly17:19
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hemnathis is how I originally wrote the driver, because I knew of the 3PAR limitations for creating cloned volumes.17:20
hemnabut this patch changed all that, in an attempt to make rally happy during delete.17:21
whoami-rajathemna:  ohh17:22
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whoami-rajathemna: i thought the initial functionality while implementing the driver was to convert to base volume17:23
hemnabut that patch causes all sorts of problems with rally if you try and create 100 volumes of any size17:23
whoami-rajatso i remember raghavendrat  argued to keep support of the current functionality that wasn't intended at all.17:24
hemnaoriginally the 3PAR driver didn't clone the volume during create from snap.17:24
hemnabecause of all the stuff I mentioned above17:25
hemnait creates a rw snapshot17:25
hemnawhich is basically just a metadata change on the parent snap17:25
hemnacrazy fast17:25
hemnaand it would only convert to a base volume if the new volume was larger than the original snap17:25
whoami-rajathemna: makes sense. now i understand your concerns regarding the patch.17:27
hemnaunforunately I have a lot of history with the 3PAR :P17:27
whoami-rajathemna: probably the author is just trying to keep the current (but not intended) functionality.17:28
hemnaI think so17:28
whoami-rajathemna: yes, a lot17:29
whoami-rajathemna:  so, the fast solution coming into my mind is17:29
whoami-rajathemna: since the patch is just adding a new extra spec, and your concern is a little bit different from the point of patch, we merge this and then change the default to false in the next PS.17:30
hemnaPS ?17:30
whoami-rajathemna: or add a comment about all the things you explained currently for the usecase and set the option to false as default with that comment.17:31
whoami-rajathemna: oh sorry, followup.17:31
hemnawe have a customer that can make use of that patch today :P17:31
hemnaI just wanted the default to be changed, such that large volume creations work out of the box17:31
hemnaas they used to.17:32
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whoami-rajathemna: yes, but the change that shouldn't have merged and this patch brought up the same Case again. Most probably we can summarize the benefit for setting the convert_to_base to false as default in a comment, and add the following to current patch. does that seem like the right approach?17:35
hemnaeither way there should be some documentation associated with this patch to explain this17:36
hemnaand the cost benefits of both True and False for customers.17:37
hemnaI have to go get some lunch..bbiab17:37
whoami-rajathemna: is this worth discussing why the cloning is slower compared to other drivers?17:37
whoami-rajathemna: ok see ya! Thanks for your insights.17:37
hemnawell, that's a 3PAR specific comparison vs. other backends17:38
hemna3par just is very slow in cloning17:38
whoami-rajathemna: ok, better not to dig more into that.17:40
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whoami-rajathemna: I'm really not sure why rally jobs were failing, it is initially deleting the volumes then snapshot[1] so the dependency shouldn't cause problem, do we need any wait_for_resource_delete func to make these operations synchronous, not sure. the bug doesn't seem like a bug now, sometime it may or may not fail IMO.18:20
whoami-rajatAlso i found your review regarding the patch[2], looking at the rally job makes me think we can revert this change.18:20
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whoami-rajathemna: and if we are going forward with reverting this change, we can easily set the value default=False for convert_to_base.18:27
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openstackgerritMerged openstack/cinder master: Update minimal acceptable glanceclient
openstackgerritMerged openstack/cinder master: Update required version of taskflow
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openstackgerritMerged openstack/cinder stable/pike: Fix for auth version change in Brcd HTTP
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hemnadid we get a bug filed about the filter issue?20:51
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smcginnisNot that I've seen.20:57
smcginnisThere may be an existing one for a very specific side effect of all of that, but not the actual real issue.20:57
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angela-ssmcginnis, jungleboyj, hemna: thanks guys, Pike is done.  Now how about Ocata, man is this tedious. Thank you!21:36
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