[linux-lvm] Trim support on stripped volumes ?

Franck Routier (personnel) alci at mecadu.org
Tue May 24 09:51:06 UTC 2011

I found this commit
that suggests it could work, but I'm not sure at all...


Le mardi 24 mai 2011 à 11:20 +0200, Franck Routier (personnel) a écrit :
> Hi,
> I have set-up of server with 4 SSDs (OCZ Vertex 2) stripped using LVM.
> Logical volume has been created using the -i 4 option (iostat confirms
> that the 4 disks work in parallel when I write a file).
> Ext4 fs is used on the volume, mounted with -discard option.
> I am using kernel 2.6.38.
> My question is : is there a chance that TRIM command makes its way to
> the disks through LVM ? I've read contradictory informations on the web
> and I'm sure this is the best place to ask.
> My second question is : how would I make _sure_ it works ?
> I've found a way to do it with hdparm --fibmap and hdparm --read-sector
> here http://askubuntu.com/questions/18903/how-to-enable-trim
> But I don't think this can work with LVM. Would there be a similar way
> to make sure it is working while using LVM ?
> Thanks a lot,
> Franck
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