MD Warnings on RAID5 linux 2.4.22

MD Warnings on RAID5 linux 2.4.22

[Don Jessup]

  I have raid 5 array that I'm --assembling on a computer but when I
 assemble it and start and stop the array.  I get the following warnings.



Apr  5 15:19:57 DM200_791498 kernel: md14: WARNING: [dev e7:a4] appears to be
on the same physical disk as [dev
e7:a0]. True
Apr  5 15:19:57 DM200_791498 kernel:      protection against single-disk
failure might be compromised.
Apr  5 15:19:57 DM200_791498 kernel: md: bind<[dev e7:a4],5>
Apr  5 15:19:58 DM200_791498 kernel:  [events: 0000007f]
Apr  5 15:19:58 DM200_791498 kernel: md14: WARNING: [dev e7:90] appears to be
on the same physical disk as [dev
e7:a4]. True
Apr  5 15:19:58 DM200_791498 kernel:      protection against single-disk
failure might be compromised.
Apr  5 15:19:58 DM200_791498 kernel: md: bind<[dev e7:90],6>




   I was wondering how to make these warnings stop?  There does not 
  seem to be a problem with single disk failure.

   The command I'm using to assemble the RAID looks like the following:
      mdadm --assemble /dev/md14
--uuid=c9cc5194:50e0de0d:af3b7236:a60790c9
--update=super-minor /dev/mapd145:1 /dev/mapd149:1 /dev/mapd153:1
/dev/mapd157:1 /dev/mapd161:1 /dev/mapd165:1


=====
Don Jessup
Asaca/Shibasoku Corp. of America
400 Corporate Circle, Unit G
Golden, CO  80401
303-278-1111 X232
donj@asaca.com
http://www.asaca.com

RE: MD Warnings on RAID5 linux 2.4.22

[Guy]

Are they on the same disk?
I guess you added the "True".
If 1 disk fails your RAID array will see 2 failures.
You will lose data if this happens!

This trick is to only use each disk once for any one array.

-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Don Jessup
Sent: Friday, March 26, 2004 6:25 PM
To: linux-raid@vger.kernel.org
Subject: MD Warnings on RAID5 linux 2.4.22



  I have raid 5 array that I'm --assembling on a computer but when I
 assemble it and start and stop the array.  I get the following warnings.



Apr  5 15:19:57 DM200_791498 kernel: md14: WARNING: [dev e7:a4] appears to
be
on the same physical disk as [dev
e7:a0]. True
Apr  5 15:19:57 DM200_791498 kernel:      protection against single-disk
failure might be compromised.
Apr  5 15:19:57 DM200_791498 kernel: md: bind<[dev e7:a4],5>
Apr  5 15:19:58 DM200_791498 kernel:  [events: 0000007f]
Apr  5 15:19:58 DM200_791498 kernel: md14: WARNING: [dev e7:90] appears to
be
on the same physical disk as [dev
e7:a4]. True
Apr  5 15:19:58 DM200_791498 kernel:      protection against single-disk
failure might be compromised.
Apr  5 15:19:58 DM200_791498 kernel: md: bind<[dev e7:90],6>




   I was wondering how to make these warnings stop?  There does not 
  seem to be a problem with single disk failure.

   The command I'm using to assemble the RAID looks like the following:
      mdadm --assemble /dev/md14
--uuid=c9cc5194:50e0de0d:af3b7236:a60790c9
--update=super-minor /dev/mapd145:1 /dev/mapd149:1 /dev/mapd153:1
/dev/mapd157:1 /dev/mapd161:1 /dev/mapd165:1


=====
Don Jessup
Asaca/Shibasoku Corp. of America
400 Corporate Circle, Unit G
Golden, CO  80401
303-278-1111 X232
donj@asaca.com
http://www.asaca.com
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Re: MD Warnings on RAID5 linux 2.4.22

[Luca Berra]

On Fri, Mar 26, 2004 at 03:24:38PM -0800, Don Jessup wrote:
>Apr  5 15:19:57 DM200_791498 kernel: md14: WARNING: [dev e7:a4] appears to be
>on the same physical disk as [dev
>e7:a0]. True
....
>   The command I'm using to assemble the RAID looks like the following:
>      mdadm --assemble /dev/md14
>--uuid=c9cc5194:50e0de0d:af3b7236:a60790c9
>--update=super-minor /dev/mapd145:1 /dev/mapd149:1 /dev/mapd153:1
>/dev/mapd157:1 /dev/mapd161:1 /dev/mapd165:1
>
>

It seems that the kernel does not have any knowledge that device type 7e
should be handled differently.
the disk driver should define a correct minor_shift which will allow md
to know if two devices are on the same physical disk or not.

fix your disk device driver. or at least tell us which kind of hw it is.

L.


-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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