Date: Thu, 20 May 2010 06:40:46 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Amaru Netapshaak <postfix_amaru@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: 7.0/i386 to 8.0/amd64 - gmirror/gstripe migration Message-ID: <4BF4CB5E.4040309@infracaninophile.co.uk> In-Reply-To: <778824.131.qm@web59508.mail.ac4.yahoo.com> References: <461532.61991.qm@web59507.mail.ac4.yahoo.com> <778824.131.qm@web59508.mail.ac4.yahoo.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 20/05/2010 24:03:17, Amaru Netapshaak wrote: > I am planning to move from 7.0-REL-i386 to 8.0-REL-amd64 > in the near future. My OS drive is a single > ata-133 80gb drive, and > my data drives are four 1.5TB SATA drives. 6TB total, configured as 2x > 3TB > 'gstripe' volumes, and I am using gmirror to mirror those > gstripe volumes. I hope that makes sense. Errr... the usual way of doing this is to create mirrored pairs of drives and then stripe the mirrors together (a.k.a RAID10 -- creating a pair of stripes and then mirroring them is RAID0+1). There's very little difference in performance characteristics between the two, but RAID10 is more failure resistant. Think about what happens if you lose one drive. In the RAID10 case one mirror pair runs in degraded mode. In the RAID0+1 case, one stripe -- half of your drives -- is out of action. > In any case, I'd like > to just unplug the drives, do my upgrade, plug the drives back in, and > startup the > array as I have in 7.0. I'm planning to just do a > fresh install of 8.0 on a new SATA 80GB drive and > make that my new OS drive. Should be fine. I've done source upgrades from 7.x to 8.0 and gmirror has "just worked." If your old 7.0 drive is still in decent working order, it might be an idea to set up the new 8.0 drive as half of a gmirror, and then reuse the 7.0 drive as the other half once you're happy that the upgrade succeeded. If the disks aren't identical, you'll need to make sure that the new 8.0 disk is not bigger than the old 7.0 drive -- look at the number of sectors on each disk for the best comparison. Cheers, Matthew - -- Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkv0y14ACgkQ8Mjk52CukIxK6wCdE9AEVBJbvT3IjT3CWpcYaam4 mk0An03OU96lPTtF7VigcT976Qr1ssdf =3yzZ -----END PGP SIGNATURE-----
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