raid 5 problems

 cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : inactive sda1[5](S) sde1[2](S) sdd1[1](S) sdc1[0](S) sdf1[3](S)
      9767562680 blocks super 1.2

unused devices: <none>


sudo mdadm --examine --scan -vv /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 907c9fd0:d917c142:cffce290:78f4ee7e
           Name : localhost.localdomain:1
  Creation Time : Mon Apr 18 12:11:05 2011
     Raid Level : raid5
   Raid Devices : 5

 Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
     Array Size : 15628097536 (7452.06 GiB 8001.59 GB)
  Used Dev Size : 3907024384 (1863.01 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 1666a7ee:f8f2fca0:bf176106:c762d3ed

    Update Time : Thu Dec  6 09:12:24 2012
       Checksum : d1f17d82 - correct
         Events : 180671

         Layout : left-symmetric
     Chunk Size : 256K

   Device Role : Active device 4
   Array State : AAAAA ('A' == active, '.' == missing)


sudo mdadm --examine --scan -vv /dev/sdc1
/dev/sdc1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 907c9fd0:d917c142:cffce290:78f4ee7e
           Name : localhost.localdomain:1
  Creation Time : Mon Apr 18 12:11:05 2011
     Raid Level : raid5
   Raid Devices : 5

 Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
     Array Size : 15628097536 (7452.06 GiB 8001.59 GB)
  Used Dev Size : 3907024384 (1863.01 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : active
    Device UUID : d4183189:9bd063c2:2c40e26c:742eab7e

    Update Time : Thu Dec  6 09:14:09 2012
       Checksum : 85350264 - correct
         Events : 180673

         Layout : left-symmetric
     Chunk Size : 256K

   Device Role : Active device 0
   Array State : AAAA. ('A' == active, '.' == missing)

sudo mdadm --examine --scan -vv /dev/sdd1
/dev/sdd1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 907c9fd0:d917c142:cffce290:78f4ee7e
           Name : localhost.localdomain:1
  Creation Time : Mon Apr 18 12:11:05 2011
     Raid Level : raid5
   Raid Devices : 5

 Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
     Array Size : 15628097536 (7452.06 GiB 8001.59 GB)
  Used Dev Size : 3907024384 (1863.01 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : active
    Device UUID : 722c772a:652da08f:4550c0f6:1c2782d6

    Update Time : Thu Dec  6 09:14:09 2012
       Checksum : d56c7b8e - correct
         Events : 180673

         Layout : left-symmetric
     Chunk Size : 256K

   Device Role : Active device 1
   Array State : AAAA. ('A' == active, '.' == missing)

sudo mdadm --examine --scan -vv /dev/sde1
/dev/sde1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 907c9fd0:d917c142:cffce290:78f4ee7e
           Name : localhost.localdomain:1
  Creation Time : Mon Apr 18 12:11:05 2011
     Raid Level : raid5
   Raid Devices : 5

 Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
     Array Size : 15628097536 (7452.06 GiB 8001.59 GB)
  Used Dev Size : 3907024384 (1863.01 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : active
    Device UUID : afb7447b:d3574097:4ddc8f63:264ecb73

    Update Time : Thu Dec  6 09:14:09 2012
       Checksum : 37f2e44c - correct
         Events : 180673

         Layout : left-symmetric
     Chunk Size : 256K

   Device Role : Active device 2
   Array State : AAAA. ('A' == active, '.' == missing)

sudo mdadm --examine --scan -vv /dev/sdf1
/dev/sdf1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 907c9fd0:d917c142:cffce290:78f4ee7e
           Name : localhost.localdomain:1
  Creation Time : Mon Apr 18 12:11:05 2011
     Raid Level : raid5
   Raid Devices : 5

 Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
     Array Size : 15628097536 (7452.06 GiB 8001.59 GB)
  Used Dev Size : 3907024384 (1863.01 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : active
    Device UUID : 78b36758:cda2dd66:8efa1437:b4025211

    Update Time : Thu Dec  6 09:14:09 2012
       Checksum : 55befdde - correct
         Events : 180673

         Layout : left-symmetric
     Chunk Size : 256K

   Device Role : Active device 3
   Array State : AAAA. ('A' == active, '.' == missing)