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Iotop tool reports that md2_raid1 takes HDD IO up to 99 %. The server's HDD becomes busy and it's impossible to do any operation on it.

Here is the output of cat /proc/mdstat:

Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md2 : active raid1 sda3[0] sdb3[1]
      1462766336 blocks [2/2] [UU]

md1 : active raid1 sda2[0] sdb2[1]
      264960 blocks [2/2] [UU]

md0 : active raid1 sda1[0] sdb1[1]
      2102464 blocks [2/2] [UU]

unused devices: <none>
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What does "mdadm --detail /dev/md2" show you? – gac May 28 '12 at 14:39
Please take a look the output on – pithagora May 29 '12 at 5:31

Looks like one of your HDDs is failing. check SMART values, test it with low-level utilities, e.g. MHDD or Victoria, or replace with new one and see if it helps.

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Decided to move to an other server with other disks and hardware raid controller. – pithagora May 29 '12 at 14:31

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