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Re: [linux-lvm] thin discards



As a pure matter of opinion, I enjoy "fat provisioning" on my filesystems, since I run a desktop and in theory it really cuts down on physical fragmentation.

Snapshots are something I use whenever I need to make a fundamental reconfiguration to the system as a whole that can't be done live, such as resizing or reconfiguring the root filesystem.

This would preclude the unquestionable usage of thin volumes.



On Mon, Jul 22, 2013 at 3:16 AM, Zdenek Kabelac <zkabelac redhat com> wrote:
Dne 22.7.2013 12:12, Raymond Jennings napsal(a):

I tried to run a fstrim on a mounted snapshot (regular snapshot, not thin
snapshot) and got zip.


I've been talking about  thin snapshots.

Of course - for old non-thin snapshot - TRIM is not supported.
(And it doesn't look like anything simple to implement)

Zdenek




On Mon, Jul 22, 2013 at 2:47 AM, Zdenek Kabelac <zkabelac redhat com
<mailto:zkabelac redhat com>> wrote:

    Dne 21.7.2013 21:40, Zdenek Kabelac napsal(a):

        Dne 21.7.2013 13:01, Raymond Jennings napsal(a):

            Do snapshots behave the same way as thin volumes wrt discards?


    Yes, snapshots are just like any other thin volumes.

    Just a side note - until I think 3.9 kernel there used to be
    bug, which had wrong ref-counting of shared blocks.

    Zdenek





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