Wednesday, 2018-06-20

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catmandohey all11:32
catmandoi have a question regarding large numbers of volumes attached to an ibmi lpar created and controlled through powervc11:33
catmandoi 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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efriedcatmando: Gerald is your man for this question, I think.13:18
efriededmondsw: 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 powervc13:19
efried6:34:29 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
catmandoI 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 volumes13:20
catmandoi 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 moment13:21
edmondswcatmando there is a recent mailing list post about increasing that 64 limit13:21
edmondswI believe PowerVC worked around that limit, but I assume you're not using PowerVC here, correct?13:22
catmandoedmondsw: i am, via tjhe api13:22
edmondswcatmando I thought the 64 limit was per hypervisor, though, rather than per adapter13:22
catmandoit has not, certainly not in 1.413:22
catmandoi hit the limit in both the GUI and the API13:23
edmondswhmmm... I'll try to rope in Gerald and he'll know what's going on13:23
catmandoedmondsw: it's per adapter (and really this only applies to our IBM i LPARs)13:23
edmondswit applies to everything, but IBM i is where folks try to attach 1000 volumes so they're the ones who hit it13:24
catmandoedmondsw: sorry that's what i meant13:24
catmandoour engineers love requesting 272 80Gb LUNs13:24
edmondswgotta love IBM i...13:25
catmandoit's strange: https://www.ibm.com/support/knowledgecenter/en/SSXK2N_1.3.1/com.ibm.powervc.standard.help.doc/powervc_import_volume_images_hmc.html13:25
catmandodoes not exist in the 1.4 docs13:25
catmando```For NPIV connections, at most 64 volumes can be attached.```13:26
catmandoat any rate, i shall await any hints13:27
catmandothank you13:27
catmandoas usual, this is my favourite IRC channel13:27
efriedThe limit in nova was 26.  Not sure how you're getting around that via pvc.13:29
efriedAnd the nova limit was per instance.13:30
efriedwait, catmando, are you hitting 64 on a single instance, or on one adapter but with the volumes spread across multiple instances?13:31
catmando64 / instance13:31
catmandothe 26  limit was solved a couple of years ago iirc13:31
catmandosince pvc will create a virtual fiber card /  lpar13:32
efriedokay, that must be pvc overrides then.13:34
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openstackgerritEric Berglund proposed openstack/nova-powervm master: WIP: Snapshot In-tree Backports  https://review.openstack.org/57663013:44
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efriedcatmando: Here's gman-tx - care to repeat your query?13:46
catmandogman-tx: powervc has a limit of 64 volumes / lpar13:52
catmandowe often have hundreds of volumes attached to (ibmi) lpars13:53
catmandowe can obviously do the first 64 in powervc13:53
catmandoand then create further virtual fiber adapters and zone manually13:53
catmandois there any plan for dealing with this in powervc?13:54
catmandothe 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
catmandoi hope that makes sense13:56
gman-txhey 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
catmandogman-tx: newer version?14:02
catmandoas in beyond 1.4?14:02
gman-txibmi version14:02
catmandoah, but i'm referring to powervc :)14:03
catmandopowervc won't let me create or attach more than 64 volumes per instance14:04
catmandowe mostly run ibmi 7.314:04
gman-txhmm14:05
gman-txthe ibmi guys may have added a restriction I'm not aware of ... will have to look ... I14:05
edmondswisn't IBM i normally vSCSI instead of NPIV, and the 64 limit is an NPIV thing?14:06
gman-txboth vscsi and npiv14:06
catmandovsci is documented at 32 volumes14:06
gman-txwhere?14:07
openstackgerritEric Berglund proposed openstack/nova-powervm master: Snapshot In-tree Backports  https://review.openstack.org/57663014:08
esbergluefried: edmondsw: ^ is ready for review14:08
efriedack14:09
esbergluEverything from snapshot is either there, already covered under a TODO, or added to the TODOs14:09
edmondswesberglu tx14:10
catmandogman-tx: https://www.ibm.com/support/knowledgecenter/en/SSXK2N_1.3.1/com.ibm.powervc.standard.help.doc/powervc_import_volume_images_hmc.html14:16
catmandogman-tx: unfortunately that page seems to have disappeared in later versions of the documentation14:19
gman-txhmm14:22
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catmandogman-tx: i know14:35
openstackgerritEric Berglund proposed openstack/nova-powervm master: Snapshot In-tree Backports  https://review.openstack.org/57663014:51
openstackgerritEric Berglund proposed openstack/nova-powervm master: Snapshot In-tree Backports  https://review.openstack.org/57663014:55
catmandogman-tx: any ideas?15:07
gman-txcatmando: I know those numbers are no longer valid and they depend on the level of os400.15:16
catmandogman-tx: interesting...that would suggest that i'd have to modify the internals of powervc to work around that15:17
catmandofor now, anyway15:17
catmandowhere could i open this as a bug/request?15:17
gman-txpowervc doesn't have those restrictions ... we would gladly let you add 500 volumes to the VM ...  you just wouldn't be able to use them15:18
catmandogman-tx: it does, since it literally won't allow you to add more than 64 on any npiv connection15:21
catmandoand 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 that15:22
gman-txis this from the UI?15:23
catmandoand the api15:23
catmandohttps://pasteboard.co/HqMFEEB.png15:24
catmandothat's 1.415:24
gman-txthat the create multiple ui15:26
gman-txwe limit create to 64 at a time15:26
catmandoah15:26
catmandoso if i make individual calls...interesting15:27
catmandoi can do that. it's a bit inefficient, but i can do that.15:27
catmandostill, once i have created over 128, i'd still have to rezone some through a new virtual card15:27
gman-txwe looked at larger numbers ... but some storage providers already took over an hour to 6415:28
gman-txright that the future stuff we are looking at15:28
catmandogman-tx: i am spoiled with my A9R15:28
gman-txsweet15:28
catmandosorry you were saying15:29
gman-txwe 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 pair15:32
catmandothat sounds awesome15:33
gman-txit does doesn't it15:33
catmandoi wish you success and a speedy release15:33
catmando:D15:33
gman-tx:-)15:33
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efriedesberglu 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
edmondswefried sure20:39
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edmondswesberglu please fix your OOT commit accordingly20:54
esbergluwill do20:55
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