zfs rename does not rename snapshot read only devices udev

[byteharmony]

My test machine had rc11 (didn't get a chance to test with rc12 yet). System had a 6xx snapshots. Rename a volume did rename the snapshots in zfs, but the snapshot devices did not get renamed.

BK

[behlendorf]

This was fixed in rc12

[byteharmony]

Sorry i didn't test rc12 before posting.

Thanks,
BK

[behlendorf]

See commit 0e20a31 , I'm closing this issue since this was addressed in what will be rc13 (this was not fixed in rc12 which is what I stated above). @byteharmony if you find you still have issues with master we can reopen it and get them resolved.

[byteharmony]

AWESOME!

I was wondering if you have any ideas on 2 other fronts.

1.   I noticed I no longer have to use write through or write back disks in KVM, I can use no cache. So your team implemented something to make that work (since rc8, that was the last time I tested that). The using no cache appears to be significantly faster and reduced the load levels on the systems running zfs zvol based kvm guests.
   

2.   On the snapshot topic, is there anyone aware of the work redhat is doing to integrate KVM with windows VSS based snapshots. It would be the best thing ever if we could get our ZOL system snapshots to be a part of that. Even if redhat doesn’t officially support it. My experience with the redhat team as I started using commercially supported software from them (after using CentOS for a long time) has been very positive.
   

Thanks again.
BK

[behlendorf]

1.   I noticed I no longer have to use write through or write back disks in KVM, I can use no cache. So your team implemented something to make that work (since rc8, that was the last time I tested that). The using no cache appears to be significantly faster and reduced the load levels on the systems running zfs zvol based kvm guests.
   

We didn't fix this explicitly, but I expect the various memory management improvements since rc8 helped with this. Several other deadlocks were resolved which might of been the root cause, it's hard to say for sure without a stack trace from rc8.

1.   On the snapshot topic, is there anyone aware of the work redhat is doing to integrate KVM with windows VSS based snapshots. It would be the best thing ever if we could get our ZOL system snapshots to be a part of that. Even if redhat doesn’t officially support it. My experience with the redhat team as I started using commercially supported software from them (after using CentOS for a long time) has been very positive.
   

Sorry, I'm not familiar with it.

[byteharmony]

https://events.linuxfoundation.org/slides/2011/linuxcon-japan/lcj2011_sorensen.pdf

Here is a doc on the VSS snapshot / KVM info.

No need to figure out how / why it's fixed, if it breaks I'll let you know :)

Thanks!
BK

[behlendorf]

@byteharmony I've opened #1129 to track the KVM feature. It looks very doable and very neat.