Date: Tue, 27 Jun 2006 18:03:12 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, freebsd-arch@freebsd.org Subject: Re: Accessing disks via their serial numbers. Message-ID: <20060627080312.GB714@turion.vk2pj.dyndns.org> In-Reply-To: <56651.1151347579@critter.freebsd.dk> References: <20060626171035.GE12511@garage.freebsd.pl> <56651.1151347579@critter.freebsd.dk>
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--WYTEVAkct0FjGQmd Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, 2006-Jun-26 18:46:19 +0000, Poul-Henning Kamp wrote: >>> 4. It prevents cold-state swapout of disk drives. >> >>Why? > >Because /etc/fstab contains the serial number of the disk you just >junked and the new one has a different serial number. I've used a couple of OSs that derived their logical disk name (ie /dev/disk/dsk5) from the WWID by keeping a magic database to map the WWID to the name. None of them have good solutions to telling the OS that WWID-x has died and I want WWID-y to now map to the same logical device as WWID-x used to. Actually having the WWID (or similar) as the logical name would make handling a disk swap really nasty. Stating that the sysadmin knows about the change doesn't address the issue: The sysadmin changed the device because the old one failed. There may or may not have been advance notice of the replacement. --=20 Peter Jeremy --WYTEVAkct0FjGQmd Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEoOY+/opHv/APuIcRAtEEAJ4un7nyX2TVR9pB99uZMZHXmhvDUgCfShjI CyYrnJ3bYld4/OARNbeH8VA= =MfX6 -----END PGP SIGNATURE----- --WYTEVAkct0FjGQmd--
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