Linux raid autodetect partition disappears after RAID degrade

["Marcin M. Jessa" <lists@yazzy.org>]

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