"head units" crash or do weird things, but disks persist. There are a couple of HA head-unit solutions out there but most of them have their own separate storage and they effectively just send transaction groups to each other.
The other way is to connect 2 nodes to an external SAS/FC chassis. create desired ZPools. Assign some subset of pools to node A, the rest to node B. When failure occurs the other node imports the other's pools and exports as NFS/iSCSI/whatever. You'll have to have a clustering/quorum and resource migration subsystem obviously. Or if you want simple act/passive, a means to make sure both heads don't try to import the same pools. _______________________________________________ zfs-discuss mailing list firstname.lastname@example.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss