Kebabber,

You can't expose zfs filesystems over iSCSI.

You only can expose ZFS volumes (raw volumes) over iscsi.

PS: 2 weeks ago I did a few tests, using filebench.

I saw little to no improvement using a 32GB Intel X25E SSD.

Maybe this is because filebench is flushing the cache in between tests.

I also compared iscsi boot time (using gpxe as boot loader) ,

We are using raidz storagepool (4disks). here again, adding the X25E as cache 
device did not speedup the boot proccess. So I did not see real improvement. 

PS: We have 2 master volumes (xp and vista) which we clone to provision 
additional guests. 

I'm now waiting for new SSD disks (STEC Zeus 18GB en STEC Mach 100GB.), since 
those are used in SUN 7000 product. I hope they perform better.

Kristof
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