[DRBD-user] DRBD below or on top of LVM

[H.D.]

Hello Graham,

thank you for your detailed answer.

> Is it solely for scheduled backups?

I'm currently evaluating what is possible. In an ideal world I'd like to 
have a full HA setup with two nodes perfectly managed by heartbeat and 
the passive node being responsible for backup and archiving :)

> If you use LVM at the bottom of the stack (...) you're going to have 
128MB of metadata on the end that doesn't interest you.

Can't I put DRBD's meta data on another partition and only snapshot the 
actual data?

If I understand you correctly, as long as there is a file system on top 
and the stack looks like:

LVM2 -> DRBD -> XFS

I should be able to do a snapshot, mount it rw and the filesystem will 
ignore the 128MB at the end? I understand that to restore I can't bypass 
DRBD. If I need to restore I have to move a lot of data anyway -- or I 
missed an option in LVM that allows me to "reapply" a snapshot back to 
the partition it was taken from.

Thanks for your time.


-- 
Regards,
H.D.