Re: thin discards

[Raymond Jennings <shentino@gmail.com>]

So can thin volumes support discards independently of the device underneath them?

I expected fstrim to free space in the thin pool.

On Tue, Jul 16, 2013 at 4:33 AM, Raymond Jennings <shentino@gmail.com> wrote:

Gentoo

sys-kernel/gentoo-sources-3.10.1

sys-fs/lvm2-2.02.97-r1

I don't know if the pool device is capable of trim support.  I do know that the underlying device, a seagate hard drive, does not support discard.  However one would think that thin volumes have their own discard handling to deallocate internally, possibly passing a discard down to the underlying block device as needed.

On Tue, Jul 16, 2013 at 3:16 AM, Zdenek Kabelac <zkabelac@redhat.com> wrote:

Dne 15.7.2013 17:32, Raymond Jennings napsal(a):

I tried to run an fstrim on a mounted thin volume, but got FITRIM:  operation
not supported.

Did I screw up or something?

Is the pool device capable of TRIM support ?

Which version of lvm2 and kernel is in use ?


Zdenek

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