drbd-user March 2010 archive
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drbd-user: Re: [DRBD-user] Multiple drbd devices

Re: [DRBD-user] Multiple drbd devices

From: Mark Watts <m.watts_at_nospam>
Date: Thu Mar 11 2010 - 11:15:10 GMT
To: Guy <wyldfury@gmail.com>

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.

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

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