[5574] in linux-scsi channel archive
Re: Swapping on raid
daemon@ATHENA.MIT.EDU (Louis Mandelstam)
Wed Jan 13 03:31:03 1999
Date: Wed, 13 Jan 1999 10:29:23 +0200 (SAST)
From: Louis Mandelstam <louism@man8.com>
To: Russell Brown <russell@lls.lls.com>
cc: linux-raid@vger.rutgers.edu, linux-scsi@vger.rutgers.edu
In-Reply-To: <m100LOh-001pU3C@lls.lls.com>
On Wed, 13 Jan 1999, Russell Brown wrote:
> >Reasons TO USE RAID for swap - if the darn swap partition goes bad,
> >the kernel chokes. With a raid swap partition, a bad disk will not
> >bring down the system. Guess how I found out!!!
>
> Except that the lower level SCSI drivers* seem to croak when a disk goes
> bad and lockup the system anyway :-(
>
> * - aic7xxx in my case.
It seems some Linux SCSI drivers handle this, and some don't.
I've a Proliant 6500R using the SCSI hot-swap tray and onboard NCR53C875,
and hot-removing/adding seems to work just nicely.
I didn't have opportunity to test by actually pulling drives out of the
SCSI tray yet however, but echoing to appropriate command to
/proc/scsi/.. had the desired effect of shutting down a disk, causing md
to rebuild onto a hot spare. Removing the shut down drive at this point
works fine, and I can re-add it later, spin it up using echo ... >
/proc/scsi/... and make it part of the RAID again.
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