[DRBD-user] lvm2, striping, and drbd

Lars Ellenberg lars.ellenberg at linbit.com
Mon Aug 27 07:37:42 CEST 2007

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

On Sun, Aug 26, 2007 at 06:00:16PM -0700, kbyrd-drbd wrote:
> I haven't used drbd yet, I'm getting ready to test and deploy it.
> I've searched the archives I've seen various posts about md and
> lvm2 and I know some of this has been covered. But, I'm confused
> about the current state of things with 0.8
> I'd like something that feels like clustered RAID1+0 (that's
> striping on top of drbd). My ideal plan: lvm2 striping on top of
> four drbd pairs active/active pairs. I'd run GFS on top of this.
> Do I need cLVM instead of LVM2 for this. Does LVM striping even
> work with drbd?


DRBD does not (yet) support consistency bundling of several drbd.
so whenever you have a connection loss, your four devices will 
disconnect in a slightly different order.
consistency of your stripe set cannot be guaranteed.

I also think you'd get better performance out of drbd on top of raid.

: Lars Ellenberg                            Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH      Fax +43-1-8178292-82 :
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