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Date:      Thu, 7 May 2020 13:32:10 +0100
From:      Steve O'Hara-Smith <>
Subject:   iscsi block sizes
Message-ID:  <>

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	I've been playing with mirroring my ZFS boot drives onto zvols on
my NAS served up over iscsi. So far it seems to be working pretty well
although reboots and NAS outages do require manual recovery.

	One problem I'm seeing that's probably not really a problem is that
no matter what I put as blocksize in the target definition in ctl.conf ZFS
is seeing an 8K blocksize and moaning about it not matching the 4K
blocksize of the SSD partition. It's totally harmless and even the
performance warning is probably bogus but it would be nice to shut it up if
anyone knows how.

	I still have to work out the details of replacing a boot drive (ZFS
boot off iscsi is not going to be happening - although that would be very
cool). I think it goes boot off USB, attach iscsi target, import pool,
attach new SSD, resilver, install bootblocks, reboot and pray. A script is
probably in order when I'm sure about it.

Steve O'Hara-Smith <>

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