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Re: [linux-lvm] thin discards

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 redhat com
<mailto:zkabelac 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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