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catmando | hey all | 11:32 |
---|---|---|
catmando | i have a question regarding large numbers of volumes attached to an ibmi lpar created and controlled through powervc | 11:33 |
catmando | i know that there's a limit on 64 LUNs per adapter, but is there any plan to add the ability to create new adapters and then attach LUNs through them to go beyond 64? | 11:34 |
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efried | catmando: Gerald is your man for this question, I think. | 13:18 |
efried | edmondsw: do you know anything about this? | 13:19 |
efried | "6:33:34 AM - catmando: i have a question regarding large numbers of volumes attached to an ibmi lpar created and controlled through powervc | 13:19 |
efried | 6:34:29 AM - catmando: i know that there's a limit on 64 LUNs per adapter, but is there any plan to add the ability to create new adapters and then attach LUNs through them to go beyond 64?" | 13:19 |
catmando | I can think of a few ways to work around it in our codebase, mostly involving going directly to the HMC and then adapting some other zoning code we use to map further volumes | 13:20 |
catmando | i did think about diving into the powervc core to see if there's anything i can do to extend in there, but i won't have the time at the moment | 13:21 |
edmondsw | catmando there is a recent mailing list post about increasing that 64 limit | 13:21 |
edmondsw | I believe PowerVC worked around that limit, but I assume you're not using PowerVC here, correct? | 13:22 |
catmando | edmondsw: i am, via tjhe api | 13:22 |
edmondsw | catmando I thought the 64 limit was per hypervisor, though, rather than per adapter | 13:22 |
catmando | it has not, certainly not in 1.4 | 13:22 |
catmando | i hit the limit in both the GUI and the API | 13:23 |
edmondsw | hmmm... I'll try to rope in Gerald and he'll know what's going on | 13:23 |
catmando | edmondsw: it's per adapter (and really this only applies to our IBM i LPARs) | 13:23 |
edmondsw | it applies to everything, but IBM i is where folks try to attach 1000 volumes so they're the ones who hit it | 13:24 |
catmando | edmondsw: sorry that's what i meant | 13:24 |
catmando | our engineers love requesting 272 80Gb LUNs | 13:24 |
edmondsw | gotta love IBM i... | 13:25 |
catmando | it's strange: https://www.ibm.com/support/knowledgecenter/en/SSXK2N_1.3.1/com.ibm.powervc.standard.help.doc/powervc_import_volume_images_hmc.html | 13:25 |
catmando | does not exist in the 1.4 docs | 13:25 |
catmando | ```For NPIV connections, at most 64 volumes can be attached.``` | 13:26 |
catmando | at any rate, i shall await any hints | 13:27 |
catmando | thank you | 13:27 |
catmando | as usual, this is my favourite IRC channel | 13:27 |
efried | The limit in nova was 26. Not sure how you're getting around that via pvc. | 13:29 |
efried | And the nova limit was per instance. | 13:30 |
efried | wait, catmando, are you hitting 64 on a single instance, or on one adapter but with the volumes spread across multiple instances? | 13:31 |
catmando | 64 / instance | 13:31 |
catmando | the 26 limit was solved a couple of years ago iirc | 13:31 |
catmando | since pvc will create a virtual fiber card / lpar | 13:32 |
efried | okay, that must be pvc overrides then. | 13:34 |
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openstackgerrit | Eric Berglund proposed openstack/nova-powervm master: WIP: Snapshot In-tree Backports https://review.openstack.org/576630 | 13:44 |
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efried | catmando: Here's gman-tx - care to repeat your query? | 13:46 |
catmando | gman-tx: powervc has a limit of 64 volumes / lpar | 13:52 |
catmando | we often have hundreds of volumes attached to (ibmi) lpars | 13:53 |
catmando | we can obviously do the first 64 in powervc | 13:53 |
catmando | and then create further virtual fiber adapters and zone manually | 13:53 |
catmando | is there any plan for dealing with this in powervc? | 13:54 |
catmando | the simplistic view is that all that would be required is to create another (potentially set) of virtual fiber cards and attach the volumes through those for every set of 64# | 13:54 |
catmando | i hope that makes sense | 13:56 |
gman-tx | hey Catmando, the newer versions support 127 volumes per FC pair. We are already discussing a number of mechanism to use to get an unlimited number of FC pairs. Once we decide on an initial mechanism the plan is to start working on it. | 14:02 |
catmando | gman-tx: newer version? | 14:02 |
catmando | as in beyond 1.4? | 14:02 |
gman-tx | ibmi version | 14:02 |
catmando | ah, but i'm referring to powervc :) | 14:03 |
catmando | powervc won't let me create or attach more than 64 volumes per instance | 14:04 |
catmando | we mostly run ibmi 7.3 | 14:04 |
gman-tx | hmm | 14:05 |
gman-tx | the ibmi guys may have added a restriction I'm not aware of ... will have to look ... I | 14:05 |
edmondsw | isn't IBM i normally vSCSI instead of NPIV, and the 64 limit is an NPIV thing? | 14:06 |
gman-tx | both vscsi and npiv | 14:06 |
catmando | vsci is documented at 32 volumes | 14:06 |
gman-tx | where? | 14:07 |
openstackgerrit | Eric Berglund proposed openstack/nova-powervm master: Snapshot In-tree Backports https://review.openstack.org/576630 | 14:08 |
esberglu | efried: edmondsw: ^ is ready for review | 14:08 |
efried | ack | 14:09 |
esberglu | Everything from snapshot is either there, already covered under a TODO, or added to the TODOs | 14:09 |
edmondsw | esberglu tx | 14:10 |
catmando | gman-tx: https://www.ibm.com/support/knowledgecenter/en/SSXK2N_1.3.1/com.ibm.powervc.standard.help.doc/powervc_import_volume_images_hmc.html | 14:16 |
catmando | gman-tx: unfortunately that page seems to have disappeared in later versions of the documentation | 14:19 |
gman-tx | hmm | 14:22 |
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catmando | gman-tx: i know | 14:35 |
openstackgerrit | Eric Berglund proposed openstack/nova-powervm master: Snapshot In-tree Backports https://review.openstack.org/576630 | 14:51 |
openstackgerrit | Eric Berglund proposed openstack/nova-powervm master: Snapshot In-tree Backports https://review.openstack.org/576630 | 14:55 |
catmando | gman-tx: any ideas? | 15:07 |
gman-tx | catmando: I know those numbers are no longer valid and they depend on the level of os400. | 15:16 |
catmando | gman-tx: interesting...that would suggest that i'd have to modify the internals of powervc to work around that | 15:17 |
catmando | for now, anyway | 15:17 |
catmando | where could i open this as a bug/request? | 15:17 |
gman-tx | powervc doesn't have those restrictions ... we would gladly let you add 500 volumes to the VM ... you just wouldn't be able to use them | 15:18 |
catmando | gman-tx: it does, since it literally won't allow you to add more than 64 on any npiv connection | 15:21 |
catmando | and that's my point: if you needed more than 64, or 128 (depending on the version) powervc would simply create another virtual fiber card and use that | 15:22 |
gman-tx | is this from the UI? | 15:23 |
catmando | and the api | 15:23 |
catmando | https://pasteboard.co/HqMFEEB.png | 15:24 |
catmando | that's 1.4 | 15:24 |
gman-tx | that the create multiple ui | 15:26 |
gman-tx | we limit create to 64 at a time | 15:26 |
catmando | ah | 15:26 |
catmando | so if i make individual calls...interesting | 15:27 |
catmando | i can do that. it's a bit inefficient, but i can do that. | 15:27 |
catmando | still, once i have created over 128, i'd still have to rezone some through a new virtual card | 15:27 |
gman-tx | we looked at larger numbers ... but some storage providers already took over an hour to 64 | 15:28 |
gman-tx | right that the future stuff we are looking at | 15:28 |
catmando | gman-tx: i am spoiled with my A9R | 15:28 |
gman-tx | sweet | 15:28 |
catmando | sorry you were saying | 15:29 |
gman-tx | we are looking at providing the deployer control over what pairs of FCs will be used to attach a volume and this will allow ibmi to attach whatever number the OS can support on an FC pair | 15:32 |
catmando | that sounds awesome | 15:33 |
gman-tx | it does doesn't it | 15:33 |
catmando | i wish you success and a speedy release | 15:33 |
catmando | :D | 15:33 |
gman-tx | :-) | 15:33 |
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efried | esberglu or edmondsw, would you mind submitting a quick patch to fix up https://review.openstack.org/#/c/576630/6/nova_powervm/virt/powervm/disk/driver.py@151 ? | 20:32 |
efried | ...and then the other of you reviewing it :) | 20:32 |
edmondsw | efried sure | 20:39 |
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edmondsw | esberglu please fix your OOT commit accordingly | 20:54 |
esberglu | will do | 20:55 |
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