[linux-lvm] thin discards
zkabelac at redhat.com
Sun Jul 21 19:40:38 UTC 2013
Dne 21.7.2013 13:01, Raymond Jennings napsal(a):
> Do snapshots behave the same way as thin volumes wrt discards?
> On Sun, Jul 21, 2013 at 3:47 AM, Zdenek Kabelac <zkabelac at redhat.com
> <mailto:zkabelac at redhat.com>> wrote:
> Dne 21.7.2013 09:10, Raymond Jennings napsal(a):
> So can thin volumes support discards independently of the device
> underneath them?
> I expected fstrim to free space in the thin pool.
> Yes - you are expecting it correctly.
> Ignore is mostly usable in case you do not want to free already
> provisioned space - which might be in certain cases better for performance.
> But you need to use recent enough kernels and lvm2 tools - since discards
> support required kernel updates.
> Kernel: 3.10.1-gento
> LVM2: 2.02.97
> Are these versions recent enough?
Nope - 2.02.98 has fixes for discards - it's been just introduced in 2.02.97
and had some problems - possible those you can observe.
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