[DRBD-user] Dual primary and LVM

Gionatan Danti g.danti at assyoma.it
Thu Jul 27 09:38:34 CEST 2017

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

Il 27-07-2017 03:59 Digimer ha scritto:
> To clarify; The clustered locking in clvmd doesn't do anything to
> restrict access to the storage, it's job is only to inform other nodes
> that something changing on the underlying shared storage when it makes 
> a
> change.

Hi Digimer,
yes, I am full aware of that.

> To make sure a VM runs on only one node at a time, then you must use
> pacemaker to handle that (and stonith to prevent split-brains, but I am
> sure you know that already).
> If you use clvmd on top on DRBD, make your life simple and don't use it
> below DRBD at the same time. It's technically possible but it is
> needless complexity. You seem to already be planning this, but just to
> make it clear.
> Also note; If you don't use clvmd, then you will probably need to do a
> pv/vg/lvscan to pick up changes. This is quite risky though and
> certainly not recommended if you run DRBD in dual-primary.

Thanks for your input. I also read your excellent suggestions on link 
Igor posted.

Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti at assyoma.it - info at assyoma.it
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