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I've been working on a project at work that has kept me pretty busy this week, it involves shared storage and computing clusters which has me pretty geeked out. I must say that I've learned A LOT about Solaris clustering, iSCSI, and disk replication, throw ZFS with Xen on top of that and things get pretty complicated.
Here's a diagram of the current system I have built.
With this setup the file server has ZFS pools that replicate each disk over to the secondary, the concept is the same as a local disk mirror. I've tested out a few different fail over situations which have worked so far, the one wrench in the works is that Linux doesn't like having iSCSI targets moved around while the device is open. This means that the xen server must shut down all running domains, take the volume offline, and then restart everything. Naturally this is not desirable in production, I will be testing out a Solaris server running xVM to see how that handles moving iSCSI targets later this week.