I banged my head for a couple minutes. Resizing the ZFS is easy peasy right?

root@oi-storage:~# zfs get -Hp volsize pool0/kvm/kvmdomain
 pool0/kvm/kvmdomain       volsize 42949672960     local

Well of course that isn’t big enough…

root@oi-storage:~# zfs set volsize=42956488704 pool0/kvm/kvmdomain

No problemo, now just rescan on the Linux side right?

[root@linux-hv ~]# iscsiadm -m node --targetname iqn.2010-09.org.openindiana:02:6640d696-90b3-6709-804e-da40a0ffffff -R
[root@linux-hv ~]# dmesg
  ...
[1329034.807613] sd 4:0:0:0: [sdc] 83886080 512-byte logical blocks: (42.9 GB/40.0 GiB)
  ...

Hmm… that didn’t do it (512 * 83886080 = 42949672960). I banged around a little bit and found what I was missing:

root@oi-storage:~# sbdadm modify-lu -s 42956488704 600144f0340b80c719ff570bb7460001

Then the Linux rescan yielded more useful results:

[root@linux-hv ~]# dmesg
  ...
[1340836.125483] sdc: detected capacity change from 42949672960 to 42956488704