From owner-freebsd-fs@FreeBSD.ORG  Wed Nov  3 13:15:25 2010
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Date: Wed, 03 Nov 2010 13:15:23 +0000
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From: Pete French <petefrench@ticketswitch.com>
Cc: freebsd-fs@freebsd.org
Subject: Re: Converting a non-HAST ZFS pool to a HAST pool
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> Okay, so converting a non-HAST ZFS setup to a HAST setup using the
> same drives won't work.

See my post on the same subject - this is not true depending on
how you have your non-hast setup configured. I migrated from
gmirror to hast quite happily with no downtime.

> Any reason that it wouldn't work when replacing the drives with larger ones?

That will work fine - effectyively it's what I did as the drives were
larger under hast than under gmirror.

-pete.