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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