Multipath iSCSI

[Péter Szabó]

Dear *,

I have started to build a HA system. It runs a postgresql cluster with
two nodes (master and hot stand-by, FreeBSD 9.0, postgresl 9.1). The
storage for the database is provided by 2 separate systems (FreeBSD
9.0, iSCSI target, over ZFS). For the maximum redundancy I would like
to use multipathing on the DB nodes. For me the best would be if the 2
DB nodes and the 2 storage nodes are all FreeBSD.

Now I have 4 installed FreeBSD 9.0, iSCSI targets are in place, and
the database nodes uses the exported targets as a storage. What is
left is the multipath part.

I have search a lot in this topic, but now I am really confused. I
found some mails from this mailing list, the problem was the same, and
there was no solution, but the mails are quite old (FreeBSD 7.3). I
checked gmultipath, but it seems it is not the solution.

Does FreeBSD support iSCSI multipath currently, or should I change the
OS under the database nodes from FreeBSD to some linux distribution. I
found a lot of working configuration for linux and iSCSI multipathing.


Cheers,

Matyee