[linux-lvm] Does LVM RAID1 have TRIM support?

[Jarkko Oranen]

On Thu, 2014-09-11 at 18:31 -0500, Brassow Jonathan wrote:

> dm-raid.c does not have that - dm-raid1.c does.  dm-raid1.c is a mirroring implementation specific to device-mapper.  It is used by LVM for pvmove functionality (and is otherwise being slowly phased out).  dm-raid.c is the device-mapper wrapper around the MD RAID personalities.  It does not have discard support.
> 
> I will ask Neil what the current state of discard support is in MD.  I see that "support" was added in Oct of 2012 (starting at commit 2ff8cc2), but I remember them having problems with discards + any resync operations.  If Neil says it is ok, I will turn it on.
> 

In the code that I'm looking at dm-raid.c definitely sets
num_discard_bios to 1 on something... As does dm-raid1.c. However,
Thanks for looking into it!


>  brassow
> 
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