[Pacemaker] Pacemaker and Software Mirroring Support

[Lars Marowsky-Bree]

On 2010-04-08T08:30:27, Andrew Beekhof <andrew at beekhof.net> wrote:

> Pacemaker is storage agnostic.
> It really doesn't care how you keep the data in sync, you can use
> carrier pidgins if you like :-)

Carrier pidgeons aren't transaction safe, they fail the ACID test ;-)

> Some people use SANs, others prefer drbd (software mirroring), rsync
> batch jobs, and even nothing in some cases (ie. when they're serving
> up a static site).

Further alternatives are also csync2 (rsync on steroids), md raid
fail-over (if concurrent access to each RAID isn't needed); and, of
course, for mirroring at the SAN/FC/iSCSI level, the "cmirrord"
extensions to cLVM2 (software too).

SLE HA 11 SP1 will support cmirrord for cluster-concurrent RAID1, but it
should also be available if you build from scratch.

So basically, the Open Source stack has everything in place you need to
replace the likes of Veritas et al ;-)


Regards,
    Lars

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