[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


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."

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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