[Linux-cluster] (newbie) mirrored data / cluster ?
gordan at bobich.net
gordan at bobich.net
Tue Apr 1 09:50:10 UTC 2008
On Tue, 1 Apr 2008, Daniel Maher wrote:
>> The non-SAN option would be to use DRBD (http://www.drbd.org) and put
>> NFS, Samba, etc on top of the DRBD partition.
>
> On this topic, consider this paper by Lars Ellenberg :
> http://www.drbd.org/fileadmin/drbd/publications/drbd8.linux-conf.eu.2007.pdf
>
> Where he notes the following :
> "The most inconvenient limitations is currently that DRBD supports only
> two nodes natively."
I'm not 100% sure, but I think this limit is increased in latest 8.0 and
8.2 releases.
> While this is not a problem in my theoretical two-server setup, should
> we wish to add a third server in the future (which i find highly
> likely), then DRBD will no longer be an appropriate solution.
I'd double check that this is still a limitation. Ask on the DRBD list.
> Furthermore, that same paper seems to suggest that DRBD is best used in
> a primary / secondary relationship, whereas i'm suggesting an
> "all-primary" sort of setup.
That is the way it has been used traditionally with DRBD <= 7.x, but for a
while now primary/primary operation has been fully supported (obviously,
you need to use a FS that is aware of such things, such as GFS(2) or
OCFS(2)).
Gordan
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