All disks in the array suddenly non-fresh??

Hi,

I'm very new to raid so my question is probably very basic.

This machine I have, is set up with three partitions on
three different disks (/dev/hda3, /dev/hde1, /dev/hdg1)
forming a raid-5 array, /dev/md0.
At some point, the machine became unresponsive, and on a reboot,
I get the following:

....
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
....
md: Autodetecting RAID arrays.
md: autorun ...
md: considering hdg1 ...
md: adding hdg1 ...
md: adding hde1 ...
md: adding hda3 ...
md: created md0
md: bind
md: bind
md: bind
md: running:
md: kicking non-fresh hdg1 from array!
md: unbind
md: export_rdev(hdg1)
md: kicking non-fresh hde1 from array!
md: unbind
md: export_rdev(hde1)
md: personality 4 is not loaded!
md :do_md_run() returned -22
md: md0 stopped.
md: unbind
md: export_rdev(hda3)
md: ... autorun DONE.

I am using classic (non-mdadm) raid tools. Of course everything
like /proc/mdstat, shows I have no md0, nor can I start md0.
What would be the next logical thing to investigate, to get out
of this situation?

Boris

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Re: All disks in the array suddenly non-fresh??

Hi Boris,

This kind of problem is a result of unclean shutdown. There are 2
problems here...

On Thu, 2005-10-13 at 21:07 -0400, Boris Shingarov wrote:
> Hi,
>
> I'm very new to raid so my question is probably very basic.
>
> This machine I have, is set up with three partitions on
> three different disks (/dev/hda3, /dev/hde1, /dev/hdg1)
> forming a raid-5 array, /dev/md0.
> At some point, the machine became unresponsive, and on a reboot,
> I get the following:
>
> ...
> md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
> ...
> md: Autodetecting RAID arrays.
> md: autorun ...
> md: considering hdg1 ...
> md: adding hdg1 ...
> md: adding hde1 ...
> md: adding hda3 ...
> md: created md0
> md: bind
> md: bind
> md: bind
> md: running:
> md: kicking non-fresh hdg1 from array!
> md: unbind
> md: export_rdev(hdg1)
> md: kicking non-fresh hde1 from array!
> md: unbind
> md: export_rdev(hde1)

(1) MD superblock on hdg1 and hde1 are out-of-date.

> md: personality 4 is not loaded!
> md :do_md_run() returned -22

(2) raid5 module is not loaded. Make sure that raid5 module is loaded.

I recommend that you install and use mdadm to fix this problem.

* Examine md superblock:
mdadm --examine /dev/hda3
to record Layout, Chunk Size, disks order (disk0, disk1, disk2)
* Recreate the raid5 array with 1 "missing" disk:
mdadm -C /dev/md0 -l 5 -c [ChunkSize] -p [Layout] -n 3 [disk0] [disk1]
missing
* mount (readonly) /dev/md0
* verify the filesystem
* if everything looks good:
mdadm --add /dev/md0 [disk2]
* umount and mount /dev/md0

If you cannot boot to a console to do the above, you can boot from
Ubuntu or gentoo livecd.

--
Regards,
Mike T.


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