I recently wrote an article for the UK magazine PC Pro about iSCSI.
I used IET but I set up two servers using DRBD to implement
replication and heartbeat to implement failover. You can see the
article here:
http://www.pcpro.co.uk/realworld/82284/san-on-the-cheap.html
When I started writing the article, I just wanted to see if this
would work (and it did) as I thought it might be interesting. I had
considered the idea of using mirroring in the initiator. However, I
discovered while writing the article that the Microsoft iSCSI
initiator does not support dynamic disks and therefore mirroring
might fail on Windows. (My column is about open source so I did not
really investigate this as far as I could but this was mentioned in
the MS release notes).
As a (fairly unscientific) test, we set a Windows machine copying to
an iSCSI volume in this scenario and implemented various forms of
soft failover (stopping the heartbeat) and hard failover (we pulled
the power). In all the cases, we tried DRBD worked and we lost no
data. We did have both machines in the iSCSI target connected
together by a crossover gigabit ethernet cable and the machines were
not heavily loaded but it did work.
Regards,
Simon.
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