[DRBD-user] Multiple drbd devices

Mark Watts m.watts at eris.qinetiq.com
Thu Mar 11 12:15:10 CET 2010

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

On Thu, 2010-03-11 at 10:07 +0000, Guy wrote:
> Hi,
> I'm going to be installing some new storage servers fairly soon using
> DRBD. I currently have 2 servers with this sort of config:
> r0 Primary/Secondary
> r1 Secondary/Primary
> I'm considering changing to something like this:
> r0 Primary/Secondary
> r1 Primary/Secondary
> r2 Primary/Secondary
> r3 Secondary/Primary
> r4 Secondary/Primary
> r5 Secondary/Primary
> on top of a 4x2TB RAID 10.
> This is in the interests of splitting users (mailboxes) into smaller
> partitions. Should a full sync ever be necessary then there's only be
> 130G to sync rather than 950GB like I have now.
> Are there any gotchas or good reasons that having multiple partitions
> like that are a bad idea? The original configuration I had has worked
> fine for ages apart from the servers not coping well with a full
> resync while still being under load.
> Thanks
> Guy

It'll work, but I think you're optimistic in your resync numbers.
If one node dies, requiring a full resync of a resource, chances are
it'll need a full resync of _all_ resources.


Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower
QinetiQ - Delivering customer-focused solutions
GPG Key: http://www.linux-corner.info/mwatts.gpg
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