Friday, 2015-03-20

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openstackgerritMerged openstack/python-manilaclient: Print share export locations more pretty  https://review.openstack.org/16592303:34
openstackgerritMerged openstack/python-manilaclient: Make public shares visible for all tenants  https://review.openstack.org/14886903:52
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openstackgerritMerged openstack/manila: Imported Translations from Transifex  https://review.openstack.org/16530604:10
openstackgerritMerged openstack/manila: Enable bashate during pep8 run  https://review.openstack.org/14691504:16
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deepakcsvponomaryov, ping06:42
deepakcsvponomaryov, in latest devstack , i see sched error when manila configured with glusterfs_native driver (No valid host was found).06:43
deepakcsvponomaryov, I never saw this before (atleast 2 months back) :)06:43
deepakcsvponomaryov, so wonderign if anythign changed in the filter_sched (default) that may cause this to happen >06:43
deepakcsvponomaryov, I looked at the stats reported by glsuter_native driver, they are similar like how generic reports (as far as fields and values are concerned)06:44
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vponomaryovdeepakcs: answer is simple09:25
vponomaryovdeepakcs: share_type is used now always09:25
vponomaryovdeepakcs: and default share type has required key "driver_handles_share_servers" set to "True"09:26
vponomaryovdeepakcs: that is opposite to gluster drivers09:26
vponomaryovdeepakcs: either use your own share type, or set it via localrc for default one09:27
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vponomaryovcsaba: hello, please, inform deepakcs about answer for his question if possible ^09:44
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csabavponomaryov: thx, I'll talk with deepakcs10:49
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openstackgerritJulia Varlamova proposed openstack/manila: Automatic cleanup of share_servers  https://review.openstack.org/16618211:51
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vponomaryovbswartz, xyang_: Hello, please, look at this client change - https://review.openstack.org/158704 It is the last one left, after this one up we can make tag of manilaclient13:54
vponomaryovtag will be useful when we will set our manilaclient as dependency13:54
vponomaryovand this tag will be minimal version13:54
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xyang_vponomaryov: hi, sure14:06
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mkoderervponomaryov: bswartz: just a quick comment to bug https://bugs.launchpad.net/manila/+bug/143403914:12
openstackLaunchpad bug 1434039 in Manila "Generic driver snapshot produces corrupt filesystems" [Undecided,New]14:12
mkodererIMHO I would disable the snapshot functionality in the generic drivers as long this is not fixed14:12
mkodererdata loss is the worst case for customers :)14:12
bswartzmkoderer: I think the problem will depend on which cinder backend you use behind manila generic driver14:13
bswartznot all cinder drivers have the same snapshot semantics14:13
mkodererbswartz: are there backend supporting live snapshots?14:13
bswartznetapp backends do14:13
mkodererbswartz: this needs to get documented14:14
bswartzalthough I haven't personally tested manila generic on top of netapp cinder14:14
bswartzmkoderer: is it possible to detect this bug with an automated scenario test?14:14
mkodererbswartz: who will ever do that.. using generic with netapp ;)14:14
bswartzmkoderer: I know -- that's why it's not tested14:14
mkodererbswartz: it's maybe more a stress test than a scenario test14:15
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bswartzif we have a test that takes a snapshot and clones it and tries to mount it then we can check all driers for this bad behavior14:15
bswartzdrivers*14:15
mkodererbswartz: since we have to create a certain load to reporduce it14:15
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bswartzoh so it's not 100% of the time?14:15
mkodererbswartz: no I don't have any numbers14:16
bswartzcould we make it less likely by doing sync operations on the service VM at the time of the snapshot?14:16
bswartzbut my question is, are there times when it actually works okay?14:16
mkodererbswartz: I think the issue can be solved in the gerneric driver with "sync" or "unmount"14:17
bswartzvponomaryov: can we ssh to the service VM and "sudo sync"?14:17
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mkodererbut this will lead to a (short) downtime for NFS clients14:17
bswartzsync will not cause downtime14:18
bswartzumount will14:18
mkodererbswartz: you would need to sync+freeze if you would like to do it in the clean way14:19
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vponomaryov bswartz, mkoderer: how are you gonna make sure some user does not write data there?14:22
vponomaryovmkoderer, bswartz: while syncing?14:22
mkoderervponomaryov: that's why "freeze" the vm is necessary14:24
mkoderer= downtime14:24
vponomaryovmkoderer: then what did bswartz mean by "sync will not cause downtime" ?14:25
vponomaryovbswartz?14:25
vponomaryovbswartz: "vponomaryov: can we ssh to the service VM and "sudo sync"?" we can ssh, yes.14:26
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mkodererbswartz: to be honest I have doubts that the cinder netapp driver support live snapshots14:40
vponomaryovmkoderer: backend itself does it14:40
mkoderervponomaryov: manila backend?14:40
bswartzsorry I stepped away from my desk for a few minutes14:40
vponomaryovmkoderer: netapp storage14:41
bswartzmkoderer: why do you have doubts about the cinder driver?14:41
bswartza VM freeze would allow us to pause I/O long enough to get a clean snapshot14:41
bswartzdoes nova provide that?14:41
mkodererbswartz: because it's a block device.. how do you know anyting about the underling FS14:41
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bswartzmkoderer: a netapp snapshot of a block device is guaranteed to be "crash consistent"14:42
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bswartzthat means that any writes to the device will appear to have been in-order14:42
bswartzjust like if you pulled the plug on your fileserver14:42
mkodererbswartz: but what about client fs caches?14:43
bswartzyou can get a more consistent snapshot by quiecsing the client and flushing caches14:43
bswartzyou're correct that if the client cached writes and you take a snapshot, the writes will no be reflected14:44
bswartzhowever what is reflected will still be consistent14:44
bswartzit will just be a few seconds old14:44
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bswartzI still think it's important to point out the difference between downtime caused by an unmount of the filesystem vs a pause in I/O caused by a VM freeze14:46
bswartzin one case the manila client will see I/O errors, and in the other case, he will just see silence for a few seconds14:46
bswartzsilence is a lot better than errors, because nearly every filesystem client can deal with network hiccups by issuing retries and having timesouts, etc14:47
mkodererbswartz: yep I agree14:48
mkodererbswartz: better having some reconnections ongoing than data loss14:48
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bswartzso we don't really want to freeze the whole VM, just the frontend network14:48
bswartzmkoderer: I have targeted the bug to liberty because my gut feeling is that this would be an expensive/complex fix14:54
bswartzif someone can show a low risk/simple fix for this then we can consider pulling it into kilo14:54
bswartzI don't think we would block the release for this though because it's not a new problem and fixing it requires adding new functionality14:55
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openstackgerritMerged openstack/python-manilaclient: Implement private share_types  https://review.openstack.org/15870415:24
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vponomaryovbswartz: who is able to do tagging of manilaclient?16:20
bswartzvponomaryov: http://git.openstack.org/cgit/openstack/python-manilaclient/tag/?id=1.0.316:43
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vponomaryovbswartz: thanks =)16:45
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Maike__Is that new functionality that a share_service_network is created during the stack.sh?18:55
openstackgerritValeriy Ponomaryov proposed openstack/manila: Add share state verification for API 'unmanage'  https://review.openstack.org/16634819:03
openstackgerritValeriy Ponomaryov proposed openstack/manila: Add share state verification for API 'unmanage'  https://review.openstack.org/16634819:14
vponomaryovMaike__: devstack is able to create one Nova instance per each generic driver enabled to not handle share servers19:19
vponomaryovMaike__: generic driver uses Cinder as backend, and Cinder volume can be handled only by means of Nova API and Cinder API. So, Nova VM is requried in any case for Generic driver.19:20
vponomaryovMaike__: by default it is not installed19:21
Maike__vponomaryov: ok. I will check my configuration! At the moment there is no valid host found and no action in cinder logs during the manila create19:22
vponomaryovMaike__: 99% that scheduler filtered hosts with inappropriate driver mode19:23
vponomaryovlook at "manila type-list"19:23
vponomaryovone of share types was used19:24
vponomaryovif you did not provide it explicitly - default one will be used19:24
Maike__for me there is just the default one19:24
vponomaryovand looks like you do not have hosts with driver mode that share type requires19:24
vponomaryovjust change "driver_handles_share_servers" to vice versa19:25
vponomaryovfor this the only share type19:25
Maike__I've set driver_handles_share_servers = True19:26
vponomaryovMaike__: but do you have such backend configured?19:27
vponomaryovMaike__: look at /etc/manila/manila.conf19:27
vponomaryovMaike__: ther eshould be same opt for each driver19:27
Maike__vponomaryov: yes, it's configured in /etc/manila/manila.conf! anywhere else?19:29
vponomaryovMaike__: show me your manila.conf, "manila extra-specs-list" and "share creation" command19:30
Maike__vponomaryov: http://paste.openstack.org/show/194021/19:34
vponomaryovMaike__: ah =)19:34
vponomaryovMaike__: key : 1 -> this is the reason19:35
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vponomaryovMaike__: just remove it19:35
Maike__vponomaryov: I can fix this with type-key unset key ?19:35
vponomaryovMaike__: right19:35
vponomaryovMaike__: scheduler looks for this key on hosts, does not found it and returns to you "No hosts found"19:36
vponomaryovMaike__: it is expected as far, this is random key19:36
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Maike__vponomaryov: oh, ok. and in which case can I use this ?19:37
vponomaryovMaike__: what this?19:37
Maike__sorry.. this key=119:37
vponomaryovMaike__: I guess you set it playing with devstack's feature "MANILA_CONFIGOPT"19:38
vponomaryovMaike__: if not manually19:38
vponomaryovsorry, this one - "MANILA_DEFAULT_SHARE_TYPE_EXTRA_SPECS"19:38
Maike__I think I set it accidentally manually ;)19:38
Maike__yes19:38
Maike__!!19:38
openstackMaike__: Error: "!" is not a valid command.19:38
vponomaryovMaike__:  manila type-key default unset key19:39
Maike__vponomaryov: now it works19:39
Maike__vponomaryov: thanks!! I played around with MANILA_DEFAULT_SHARE_TYPE_EXTRA_SPECS because of an error during stack.sh19:40
vponomaryovMaike__: sorry, I need to go already19:40
vponomaryovbye19:40
Maike__vponomaryov: bye19:41
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Maike__vponomaryov: but it doesn't work.. same error message19:41
vponomaryovtry set "driver_handles_share_servers" to "True" instead of "1"19:42
vponomaryovfor share-type19:43
vponomaryovMaike__: "manila type-key default set driver_handles_share_servers=True"19:43
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Maike__vponomaryov: doesn't work :(19:45
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