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Reinhard Haller 07-23-2008 09:50 AM

raid not booting
 
Hi,

this morning my ubuntu box wasn't accessible (no local access, no ssh,
no http -- ping worked), so I resetted the server.

The box didn't boot with the following messages:

There appears to be one or more degraded RAID devices ...

md0: incative sdc2[2](S) sdb2[1](S) sdc3[3](S)

The suggested start with the degraded raid (mdadm -R /dev/md0) gives the
following messages:

mdadm: CREATE user root not found
mdadm: CREATE group disk not found
raid5: not enough operational devices for md0 (2/3 failed)

I tested all drives with the Samsung HD-Utility: they are all 3 fully
operational, the partitions are all present!

Operating system: ubuntu 8.04 kernel: 2.6.24-18-server

Any suggestions how to get it working again?

Thanks
Reinhard


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David Vincent 07-23-2008 02:33 PM

raid not booting
 
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Reinhard Haller wrote:
> Hi,
>
> this morning my ubuntu box wasn't accessible (no local access, no ssh,
> no http -- ping worked), so I resetted the server.
>
> The box didn't boot with the following messages:
>
> There appears to be one or more degraded RAID devices ...
>
> md0: incative sdc2[2](S) sdb2[1](S) sdc3[3](S)
>
> The suggested start with the degraded raid (mdadm -R /dev/md0) gives the
> following messages:
>
> mdadm: CREATE user root not found
> mdadm: CREATE group disk not found
> raid5: not enough operational devices for md0 (2/3 failed)
>
> I tested all drives with the Samsung HD-Utility: they are all 3 fully
> operational, the partitions are all present!
>
> Operating system: ubuntu 8.04 kernel: 2.6.24-18-server
>
> Any suggestions how to get it working again?

***WARNING THIS MAY DESTROY YOUR DATA***

if you are sure your drives/partitions are ok you might try this:

mdadm --create /dev/md0 --raid-devices=3 --level=5 /dev/sda2 /dev/sdb1
/dev/sdc1

...but substitute your own /dev/sd* devices in place of mine.

- -d
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wKAmcBGpQB/G04jeZgFnb5A=
=coWw
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Rashkae 07-23-2008 03:07 PM

raid not booting
 
Reinhard Haller wrote:
> Hi,
>
> this morning my ubuntu box wasn't accessible (no local access, no ssh,
> no http -- ping worked), so I resetted the server.
>
> The box didn't boot with the following messages:
>
> There appears to be one or more degraded RAID devices ...
>
> md0: incative sdc2[2](S) sdb2[1](S) sdc3[3](S)
>
> The suggested start with the degraded raid (mdadm -R /dev/md0) gives the
> following messages:
>
> mdadm: CREATE user root not found
> mdadm: CREATE group disk not found
> raid5: not enough operational devices for md0 (2/3 failed)
>
> I tested all drives with the Samsung HD-Utility: they are all 3 fully
> operational, the partitions are all present!
>
> Operating system: ubuntu 8.04 kernel: 2.6.24-18-server
>
> Any suggestions how to get it working again?
>
> Thanks
> Reinhard
>
>


Suggestions only, not tested in this kind of scenario, and may cause
permanent data loss.

Since all partitions are present and accounted for, you try to just
force the array to assemble

mdadm -A -f /dev/md0

On a side (snide?) note, please tell me that is a typo in your message
and you didn't really create a Raid 5 array with 2 partitions on the
same drive! (sdc)

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Reinhard Haller 07-24-2008 07:58 AM

raid not booting
 
Rashkae schrieb:

Reinhard Haller wrote:


Hi,

this morning my ubuntu box wasn't accessible (no local access, no ssh,
no http -- ping worked), so I resetted the server.

The box didn't boot with the following messages:

There appears to be one or more degraded RAID devices ...

md0: incative sdc2[2](S) sdb2[1](S) sdc3[3](S)

The suggested start with the degraded raid (mdadm -R /dev/md0) gives the
following messages:

mdadm: CREATE user root not found
mdadm: CREATE group disk not found
raid5: not enough operational devices for md0 (2/3 failed)

I tested all drives with the Samsung HD-Utility: they are all 3 fully
operational, the partitions are all present!

Operating system: ubuntu 8.04 kernel: 2.6.24-18-server

Any suggestions how to get it working again?

Thanks
Reinhard






Suggestions only, not tested in this kind of scenario, and may cause
permanent data loss.

Since all partitions are present and accounted for, you try to just
force the array to assemble

mdadm -A -f /dev/md0


Assembling ends in a bunch of error messages:



ata4.00: cmd 25/00:00:88:03:97/00: 03:00:00:00/e0 tag 0 dma 393216 in

ata4.00: status { DRDY }

ata4.00: revalidation failed (errno=-5)

ata4.00: revalidation failed (errno=-5)

ata4.00: revalidation failed (errno=-5)

sd 3:0:0:0: [sdb] Asking for cache data failed

sd 3:0:0:0: [sdb] Assuming drive cache write through

raind5: Disk failure on sdb2, disabling device



The same is repeated for ata3 and the next drive is disabled --> end
of start





On a side (snide?) note, please tell me that is a typo in your message
and you didn't really create a Raid 5 array with 2 partitions on the
same drive! (sdc)



yeah it is. 3 disks, 2 with swap and raid, 1 with boot, swap and raid
partitions.





Reconstructing the array with a recovery installation resulted in a
bunch of error messages. Testing the drives with

the DOS based HD-Utility gave no errors (even the complete surface
scan). Is there a way to copy the disk data

offline and assemle it?





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