[DRBD-user] DRBD Dual Primary + GFS2 for redundant KVM hosts

Gionatan Danti g.danti at assyoma.it
Fri Aug 25 22:08:19 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 25-08-2017 22:01 Digimer ha scritto:
> On 2017-08-25 03:37 PM, Gionatan Danti wrote:
> The overhead of clustered locking is likely such that your VM
> performance would not be good, I think.

Mmm... I need to do some more testing with fio, it seems ;)

> With raw clustered LVs backing the servers, you don't need cluster
> locking on a per-IO basis, only on LV create/change/delete. Because LVM
> is sitting on top of DRBD (in dual-primary), live-migration is no
> trouble at all and performance is good, too.


> GFS2, being a cluster FS, will work fine if a node is lost, provided it
> is fenced succesfully. It's wouldn't be much of a cluster-FS otherwise. 
> :)

So no problem with quorum? A loss of a system in a two-node cluster 
seems to wreack havok on other cluster filesystems (Gluster, for 


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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