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Using TRIM in dom0 for a file-based backend would not make real use of the effectiveness of TRIM in handling space cleanup in SSD disks, so I don't think I would have bothered with it, except if you're into creating and removing virtual disks. Note, however, that TRIM slows down your delete commands a little.

Etzion

On 18 October 2014 01:09, John Sherwood <jrs@xxxxxx> wrote:

Preventing SSDs from wearing out usually comes down to wear levelling, which is (typically) handled by the drive's own controller. In that case, it shouldn't matter how you grant storage to your domU. If you want to use TRIM (which I don't think Ubuntu bothers with by default), using a file backed domU would mean you should enable TRIM on the dom0, and if you pass through the device entirely, then using TRIM on the domU should work.

On Fri, Oct 17, 2014 at 2:38 PM, H C <hbc1024@xxxxxxxxx> wrote:
Hi,

Are there any considerations about setting up domUs on an SSD?Â I've
never used an SSD but have been reading about TRIM - and I'mÂ not
exactly sure if/how i need to configure the dom0 OS, Xen or domU to
prevent the SSD from wearing out.Â When I google Xen and SSD I see
that many cloud providers offer this but not much info on what I need
to do to set this up.Â Any thoughts or links i should read would be
appreciated.Â (I have not decided between file backed or lvm domUs if
that makes a difference but I think my preference is for file backed
as that seems to be easier [for me]. )

Thanks

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Re: [Xen-users] DomUs on SSD