TOPIC:

Okay, why would the iscsi target fail to start? What can I do to start it?

It's hard to tell without more info. Perhaps the target backing disk (DRBD resource) is being held by something else.

What info would be helpful? Let me know and I'll post it all here.

I don't know much about iSCSI targets, DRBD etc; I just installed your software using the automatic installer on a fresh installation of XenServer 7.0.

PS. Can I safely remove the slave from the pool and still get the iSCSI back online on the master to retrieve my data?

you should consider having someone take a look at your system before making any drastic changes. Your data should exist on both hosts.

The iSCSI target is back online now. I've been looking back through the commands I executed, and I think it might have been "service iscsi-ha restart". I'm not sure, because I checked XenCenter and it had automatically repaired itself.

I was under the impression that ha-lizard would be able to start everything up by itself when the host was turned back on after a power failure, but that does not seem to have been the case. Why would this be?