SCSI devices and device reordering 2006-01-11 - By Rafael Ferreira
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Also, if you're using the device as "raw", you can look into using
"devlabel" - just google for it.
- raf
-- --Original Message-- --
From: taroon-list-bounces@(protected)
[mailto:taroon-list-bounces@(protected)] On Behalf Of Greg Hosler
Sent: Wednesday, January 11, 2006 4:17 AM
To: Discussion of Red Hat Enterprise Linux 3 (Taroon)
Subject: RE: SCSI devices and device reordering
use device labels.
put a device label on each partition you are using, and then refer to
the
partition by label in /etc/fstab (LABEL=yourpartitionname)
e2label /dev/sda5 yourpartitionname
After that, you really won't care which scsi device your drives come up
as...
best rgds,
-Greg
On 11-Jan-2006 (See http://Jan-2006.ora-code.com) Guy Waugh wrote:
> Hi folks,
>
> I'm having a problem with SCSI devices and their ordering (I think). I
> have a Dell 6650 with a QLogic HBA attached to a HP EVA3000 SAN. The
box
> runs RHEL3U6. The box has an inbuilt SCSI controller (using the
> 'megaraid' driver) and internal disks, and before a short while ago,
all
> the local (megaraid) partitions were on the device /dev/sda.
>
> I presented 2 SAN disks to the box and rebooted, and suddenly the
local
> disk has become /dev/sdc. I unpresented one of the two SAN disks,
> rebooted the box again, and the local disk has become /dev/sdb.
>
> I have a few other Dell boxes with QLogic HBAs (1850s and 2650s), and
> this doesn't happen on them - when I present a SAN disk and reboot,
the
> local disk always stays as /dev/sda.
>
> I'm thinking it is probably because of the fact that, on the 6650, the
> megaraid SCSI controller has a Host value of 2 (from
> /proc/scsi/megaraid), where the QLogic HBA has a Host value of 1 (from
> /proc/scsi/qla2300) (excuse me if I've got the 'Host value'
terminology
> wrong). On the other boxes, the megaraid SCSI controller has a Host
> value of 1, and the QLogic HBA has a Host value of 2.
>
> I suspect that this is quite a common problem, but I can't locate any
> info on what to do about it (probably not using the right search
terms).
> Can I do anything about it?
>
> Can anyone suggest what I might do to keep the local disk as /dev/sda,
> or point me at relevant info?
>
> Thanks,
> Guy.
>
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| Greg Hosler greg@(protected) |
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