Linux raid autodetect partition disappears after RAID degrade

Hi guys.

My RAID array just kicked out one of the drives again at heavy activity
running:
# ddrescue -n -f /dev/fridge/storage storage.img ddrescue.log
where the /dev/fridge/storage LV Size is 4.88 TiB

What's strange is the device is there:
brw-rw---- 1 root disk 8, 144 Oct 2 11:48 /dev/sdj

But the /dev/sdj1 which should hold Linux raid autodetect partition just
disappeared...

# fdisk -l /dev/sdj

Disk /dev/sdj: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sdj1 63 3907029167 1953514552+ fd Linux raid
autodetect


Is this a normal behavior? I don't understand either why the heck is the
RAID degrading all the time ?
I replaced all the cables with SATA3 cables, the BIOS is updated, both
the motherboard and the drives are SATA3 and brand new.

I could not find anything about the RAID being degraded or the device
having problems in dmesg, /var/log/messages, /var/log/syslog or
/var/log/kern.log


I'm on Debian Wheezy
# uname -a
Linux odin 3.0.0-1-amd64 #1 SMP Sat Aug 27 16:21:11 UTC 2011 x86_64
GNU/Linux


--

Marcin M. Jessa
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Re: Linux raid autodetect partition disappears after RAID degrade

On 10/02/2011 12:05 PM, Marcin M. Jessa wrote:
>
> Hi guys.
>
> My RAID array just kicked out one of the drives again at heavy activity
> running:
> # ddrescue -n -f /dev/fridge/storage storage.img ddrescue.log
> where the /dev/fridge/storage LV Size is 4.88 TiB
>
> What's strange is the device is there:
> brw-rw---- 1 root disk 8, 144 Oct 2 11:48 /dev/sdj
>
> But the /dev/sdj1 which should hold Linux raid autodetect partition
> just disappeared...
>
> # fdisk -l /dev/sdj
>
> Disk /dev/sdj: 2000.4 GB, 2000398934016 bytes
> 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x00000000
>
> Device Boot Start End Blocks Id System
> /dev/sdj1 63 3907029167 1953514552+ fd Linux raid
> autodetect
>
>
> Is this a normal behavior? I don't understand either why the heck is
> the RAID degrading all the time ?
> I replaced all the cables with SATA3 cables, the BIOS is updated, both
> the motherboard and the drives are SATA3 and brand new.
>
> I could not find anything about the RAID being degraded or the device
> having problems in dmesg, /var/log/messages, /var/log/syslog or
> /var/log/kern.log
>
>
> I'm on Debian Wheezy
> # uname -a
> Linux odin 3.0.0-1-amd64 #1 SMP Sat Aug 27 16:21:11 UTC 2011 x86_64
> GNU/Linux
>

OK, this is strange, /dev/sdj shows a different End and Blocks value
then all the other drives in the array.
Any idea why this would be happening and what to do? Is that /dev/sdj
HD somehow unsafe and degraded?

# fdisk -l /dev/sdj

Disk /dev/sdj: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sdj1 63 3907029167 1953514552+ fd Linux raid
autodetect

# fdisk -l /dev/sdk

Disk /dev/sdk: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sdk1 63 3907024064 1953512001 fd Linux raid
autodetect

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