RE: RBD trim / unmap support?

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hw/ide/qdev.c:        error_report("discard_granularity must be 512 for ide");

> -----Original Message-----
> From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Stefan Priebe - Profihost AG
> Sent: Freitag, 02. November 2012 09:20
> To: Josh Durgin
> Cc: ceph-devel@xxxxxxxxxxxxxxx
> Subject: Re: RBD trim / unmap support?
> 
> Am 02.11.2012 00:36, schrieb Josh Durgin:
> > On 11/01/2012 04:33 PM, Stefan Priebe wrote:
> >> Hello list,
> >>
> >> does rbd support trim / unmap? Or is it planned to support it?
> >>
> >> Greets,
> >> Stefan
> >
> > librbd (and thus qemu) support it. The rbd kernel module does not yet.
> > See http://ceph.com/docs/master/rbd/qemu-rbd/#enabling-discard-trim
> 
> Thanks! Is there any recommanded value for discard_granularity? With
> fstrim and iscsi i use 128kb.
> 
> Stefan
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