Date: Mon, 18 Oct 2010 12:03:20 +0100 From: Pete French <petefrench@ticketswitch.com> To: fjwcash@gmail.com, pjd@FreeBSD.org Cc: freebsd-fs@freebsd.org Subject: Re: Converting a non-HAST ZFS pool to a HAST pool Message-ID: <E1P7nUu-000Fy0-LZ@dilbert.ticketswitch.com> In-Reply-To: <20101016222833.GA6765@garage.freebsd.pl>
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> HAST metadata takes much more space than glabel metadata. The latter > takes only one sector, while the former depends on provider size, but we > have to keep entire extent bitmap there, so definitely more than one > sector. I am attempting to do the same thing - convert a ZFS pool over to using hast. I have a current setup using gmirror, ggated and a pair of labeled drives. Luckily it seems that the meta data used by gmirror+glabel is biiger than that used by hast - so I should be able to do this without recreating the pool. I only mention it here because I know that the gmirror+ggate is a fairly common setup. If you start with labeled drives then you will be able to migrate to hast without any downtime. -pete.
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