* Problems with SCSI devices renaming...
@ 2004-10-19 14:47 Martin Clauss
2004-10-19 15:02 ` Luca Berra
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Martin Clauss @ 2004-10-19 14:47 UTC (permalink / raw)
To: linux-raid
Hi all,
i got a problem with my raid. Current setup:
raiddev /dev/md/0
raid-level 5
nr-raid-disks 10
nr-spare-disks 0
persistent-superblock 1
parity-algorithm left-symmetric
device /dev/scsi/host2/bus0/target0/lun0/part1
raid-disk 0
device /dev/scsi/host2/bus0/target1/lun0/part1
raid-disk 1
device /dev/scsi/host2/bus0/target2/lun0/part1
raid-disk 2
device /dev/scsi/host2/bus0/target3/lun0/part1
raid-disk 3
device /dev/scsi/host2/bus0/target4/lun0/part1
raid-disk 4
device /dev/scsi/host2/bus0/target8/lun0/part1
raid-disk 5
device /dev/scsi/host2/bus0/target9/lun0/part1
raid-disk 6
device /dev/scsi/host2/bus0/target10/lun0/part1
raid-disk 7
device /dev/scsi/host2/bus0/target11/lun0/part1
raid-disk 8
device /dev/scsi/host2/bus0/target12/lun0/part1
raid-disk 9
This works very fine so far. But when I attach an additional device to this
DEC Storage Device, I get an additional target on this SCSI bus. Now this
doesn't matter for the devfs names, but the superblock of the RAID saves
major/minor numbers that are wrong now. So the raid won't start anymore....
Shouldn't autodetect handle exactly this problem? (Yes, partition type is
linux raid autodetect for all raid disks...)
I guess, this should be a quite common problem, so I hope to find some
answers here.
Greetz,
Martin Clauss
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Problems with SCSI devices renaming...
2004-10-19 14:47 Problems with SCSI devices renaming Martin Clauss
@ 2004-10-19 15:02 ` Luca Berra
2004-10-19 17:35 ` Martin Clauss
2004-10-19 15:08 ` Matt Domsch
2004-10-19 15:15 ` Guy
2 siblings, 1 reply; 6+ messages in thread
From: Luca Berra @ 2004-10-19 15:02 UTC (permalink / raw)
To: linux-raid
On Tue, Oct 19, 2004 at 04:47:40PM +0200, Martin Clauss wrote:
>Hi all,
>
>i got a problem with my raid. Current setup:
>
>This works very fine so far. But when I attach an additional device to this
>DEC Storage Device, I get an additional target on this SCSI bus. Now this
>doesn't matter for the devfs names, but the superblock of the RAID saves
>major/minor numbers that are wrong now. So the raid won't start anymore....
>Shouldn't autodetect handle exactly this problem? (Yes, partition type is
>linux raid autodetect for all raid disks...)
>
>I guess, this should be a quite common problem, so I hope to find some
>answers here.
>
forget autodetect,
forget raidtools,
switch to mdadm.
--
Luca Berra -- bluca@comedia.it
Communication Media & Services S.r.l.
/"\
\ / ASCII RIBBON CAMPAIGN
X AGAINST HTML MAIL
/ \
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Problems with SCSI devices renaming...
2004-10-19 14:47 Problems with SCSI devices renaming Martin Clauss
2004-10-19 15:02 ` Luca Berra
@ 2004-10-19 15:08 ` Matt Domsch
2004-10-19 15:15 ` Guy
2 siblings, 0 replies; 6+ messages in thread
From: Matt Domsch @ 2004-10-19 15:08 UTC (permalink / raw)
To: Martin Clauss; +Cc: linux-raid
On Tue, Oct 19, 2004 at 04:47:40PM +0200, Martin Clauss wrote:
> device /dev/scsi/host2/bus0/target11/lun0/part1
> device /dev/scsi/host2/bus0/target12/lun0/part1
>
> This works very fine so far. But when I attach an additional device to this
> DEC Storage Device, I get an additional target on this SCSI bus. Now this
> doesn't matter for the devfs names, but the superblock of the RAID saves
> major/minor numbers that are wrong now. So the raid won't start anymore....
> Shouldn't autodetect handle exactly this problem? (Yes, partition type is
> linux raid autodetect for all raid disks...)
>
> I guess, this should be a quite common problem, so I hope to find some
> answers here.
You want something like udev (2.6 kernels) or devlabel (2.4 kernels,
http://linux.dell.com/projects.shtml), and to use those names rather
than devfs names.
Thanks,
Matt
--
Matt Domsch
Sr. Software Engineer, Lead Engineer
Dell Linux Solutions linux.dell.com & www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: Problems with SCSI devices renaming...
2004-10-19 14:47 Problems with SCSI devices renaming Martin Clauss
2004-10-19 15:02 ` Luca Berra
2004-10-19 15:08 ` Matt Domsch
@ 2004-10-19 15:15 ` Guy
2 siblings, 0 replies; 6+ messages in thread
From: Guy @ 2004-10-19 15:15 UTC (permalink / raw)
To: 'Martin Clauss', linux-raid
If you are using raidstart to start your array, then yes common problem.
Raidstart is part of raidtools, which is obsolete.
Try mdadm. You may need to install this. It was easy for me on redhat 9.
Your device names are very odd to me! What happened to /dev/sda1 and such?
The problem you are having is very similar to the problem you would have if
a disk were to fail such that it could not be seen by the system. This is
what happened to me first. I have also added disks since then with problems
like yours. But in my case the device names changed. So I am confused by
this also. For example I had 3 devices sda, sdb and sdc. If sdb were to
fail or be removed, on reboot sdc would change names to sdb. Raidstart
can't handle this, at least not for me! If my major minor/number changed, I
did not notice.
Guy
-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Martin Clauss
Sent: Tuesday, October 19, 2004 10:48 AM
To: linux-raid@vger.kernel.org
Subject: Problems with SCSI devices renaming...
Hi all,
i got a problem with my raid. Current setup:
raiddev /dev/md/0
raid-level 5
nr-raid-disks 10
nr-spare-disks 0
persistent-superblock 1
parity-algorithm left-symmetric
device /dev/scsi/host2/bus0/target0/lun0/part1
raid-disk 0
device /dev/scsi/host2/bus0/target1/lun0/part1
raid-disk 1
device /dev/scsi/host2/bus0/target2/lun0/part1
raid-disk 2
device /dev/scsi/host2/bus0/target3/lun0/part1
raid-disk 3
device /dev/scsi/host2/bus0/target4/lun0/part1
raid-disk 4
device /dev/scsi/host2/bus0/target8/lun0/part1
raid-disk 5
device /dev/scsi/host2/bus0/target9/lun0/part1
raid-disk 6
device /dev/scsi/host2/bus0/target10/lun0/part1
raid-disk 7
device /dev/scsi/host2/bus0/target11/lun0/part1
raid-disk 8
device /dev/scsi/host2/bus0/target12/lun0/part1
raid-disk 9
This works very fine so far. But when I attach an additional device to this
DEC Storage Device, I get an additional target on this SCSI bus. Now this
doesn't matter for the devfs names, but the superblock of the RAID saves
major/minor numbers that are wrong now. So the raid won't start anymore....
Shouldn't autodetect handle exactly this problem? (Yes, partition type is
linux raid autodetect for all raid disks...)
I guess, this should be a quite common problem, so I hope to find some
answers here.
Greetz,
Martin Clauss
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^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: Problems with SCSI devices renaming...
2004-10-19 15:02 ` Luca Berra
@ 2004-10-19 17:35 ` Martin Clauss
2004-10-19 19:38 ` Anu Matthew
0 siblings, 1 reply; 6+ messages in thread
From: Martin Clauss @ 2004-10-19 17:35 UTC (permalink / raw)
To: Luca Berra, linux-raid
> forget autodetect,
> forget raidtools,
> switch to mdadm.
Yep, seems a bit smarter, and I discovered that there were multiple superblocks
on some of the disks (from former usage i guess), which confused mdrun....
Now I hope that it can handle changed device names, I'll try tomorrow...
Thanks,
Martin
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Problems with SCSI devices renaming...
2004-10-19 17:35 ` Martin Clauss
@ 2004-10-19 19:38 ` Anu Matthew
0 siblings, 0 replies; 6+ messages in thread
From: Anu Matthew @ 2004-10-19 19:38 UTC (permalink / raw)
To: linux-raid
mdadm - with multipath devices: I remember it bringing up the md device
after the names changed, but had to manually add the alternate path.
And, thereafter it behaved well, and have not added any more luns yet.
Not sure if it is so in v1.7.0.
You may want to check out devlabel as Matt said..
Martin Clauss wrote:
>>forget autodetect,
>>forget raidtools,
>>switch to mdadm.
>>
>>
>Yep, seems a bit smarter, and I discovered that there were multiple superblocks
>on some of the disks (from former usage i guess), which confused mdrun....
>Now I hope that it can handle changed device names, I'll try tomorrow...
>
>Thanks,
>Martin
>
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2004-10-19 19:38 UTC | newest]
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2004-10-19 14:47 Problems with SCSI devices renaming Martin Clauss
2004-10-19 15:02 ` Luca Berra
2004-10-19 17:35 ` Martin Clauss
2004-10-19 19:38 ` Anu Matthew
2004-10-19 15:08 ` Matt Domsch
2004-10-19 15:15 ` Guy
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