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Date: Thu, 26 Nov 2009 13:36:07 -0500
From: Gary Corcoran <gcorcoran@rcn.com>
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Subject: Upgrading OS and ZFS
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I have a server consisting of a mirrored pair of UFS disks containing the OS,
which is 7.0-CURRENT-200705, and a raidz zpool, with ZFS version 6.  I want
to upgrade the OS to 8.0-RELEASE, and upgrade the zpool.  Since I don't have
any important data on the OS disks, I plan to just do a fresh install of 8.0
on the UFS disk(s).  My concern is how to do the upgrades without losing any
zfs data.

I believe I just need to do the following steps.  Please advise if this
will safely do the zpool upgrade, or whether a different sequence of actions
is required to ensure I don't lose any ZFS data.

1. zpool export poolname
2. install FreeBSD 8.0
3. zpool import poolname
4. zpool upgrade poolname

Is it really that easy?

Thanks,
Gary