RAID10 failed with two disks

[Piotr Legiecki <piotrlg@pum.edu.pl>]

Hi

I'v got RAID10 on 4 disks. Suddenly two of the disks failed (I doubt the 
disks actually failed, rather it is a kernel failure or maybe 
motherboard SATA controller)?

So after rebootig I cannot start the array. So my first question is: on 
RAID10 (default layout) which disks may fail and still the array survive?

mdadm --examine /dev/sda1
/dev/sda1:
           Magic : a92b4efc
         Version : 00.90.00
            UUID : fab2336d:71210520:990002ab:4fde9f0c (local to host bez)
   Creation Time : Mon Aug 22 10:40:36 2011
      Raid Level : raid10
   Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
      Array Size : 1953519872 (1863.02 GiB 2000.40 GB)
    Raid Devices : 4
   Total Devices : 4
Preferred Minor : 4

     Update Time : Mon Aug 22 10:40:36 2011
           State : clean
  Active Devices : 2
Working Devices : 2
  Failed Devices : 2
   Spare Devices : 0
        Checksum : d4ba8390 - correct
          Events : 1

          Layout : near=2, far=1
      Chunk Size : 64K

       Number   Major   Minor   RaidDevice State
this     0       8        1        0      active sync   /dev/sda1

    0     0       8        1        0      active sync   /dev/sda1
    1     1       8       17        1      active sync   /dev/sdb1
    2     2       0        0        2      faulty
    3     3       0        0        3      faulty

The last two disks (failed ones) are sde1 and sdf1.

So do I have any chances to get the array running or it is dead?

I've tried a few steps to run the array but with no luck.

Regards
P.