[DRBD-user] Full LVM Snapshots

Roland Kammerer roland.kammerer at linbit.com
Wed Jun 10 09:59:48 CEST 2015

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.



----- Original Message -----
From: "Christoph Mitasch" <cmitasch at thomas-krenn.com>
To: "drbd-user at lists.linbit.com" <drbd-user at lists.linbit.com>
Sent: Tuesday, June 9, 2015 1:17:42 PM
Subject: [DRBD-user] Full LVM Snapshots

Hello,

according to the DRBD Users Guide, a full snapshot can cause the origin to fail.
"A full snapshot causes both the snapshot itself and its origin volume to fail."
https://drbd.linbit.com/users-guide/s-lvm-snapshots.html    

Our experience is, that the origin can be used without interruption.

Any experiences in which situations the origin can get into trouble when a snapshot gets full?


Hi Christoph,

this is more hearsay than anything else, I hope somebody who knows LVM in more detail jumps in...

This is what a "trusted source" ;-) told me:
Thick LVM: In previous times the whole pool blocked. Probably the reason for this warning in the user guide. This should be solved for thick LVM.
Thin LVM: Can still block in recent RHEL 6.x versions.

Regards, rck



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