Re: Accessing disks via their serial numbers.
- From: Peter Jeremy <peterjeremy@xxxxxxxxxxxxxxxx>
- Date: Tue, 27 Jun 2006 18:03:12 +1000
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.
--
Peter Jeremy
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