[PVE-User] Discard transmission between VM / LVM / mdadm layers ?

Frédéric MASSOT frederic at juliana-multimedia.com
Sun Dec 15 12:51:01 CET 2019


Le 13/12/2019 à 13:15, Alexandre DERUMIER a écrit :
> When a VM sends a discard/trim command, is it sent to the SSD, LVM does
> not block the command?
> 
> Hi, yes it's working with lvm (lvm thin only)

Hi,

I opened a bug report to the debian-installer package to see if it could 
add lvm-thin support.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=946682

Ben Hutchings answered this about the non transmission of discard by 
LVM: "This seems to be incorrect. LVM normally uses dm-table, which 
supports discard if the underlying device(s) do".

I do not know what to think. Mdadm, the lower layer, supports discard.


Regards.
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