Hi all,

I have a raid1 array in a customer server which is degraded every time the system is booted. I use raid1 on others servers, with the same distribution (Fedora 8), and this problem doesn´t happens in other installations.

Both partitions in the raid1 array are marked as type 'fd - Linux raid autodetect'

I have smartd monitoring both hd´s, and there are no problems reported, so i´m pretty sure they are ok.

Do someone have a clue about what could be happening or where should i look?

Regards,

Fabiano

[root@server1-sp /]# fdisk -l

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xd678d678

Device Boot Start End Blocks Id System
/dev/sda1 * 1 18947 152191746 fd Linux raid autodetect
/dev/sda2 18948 19457 4096575 82 Linux swap / Solaris

Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0001e277

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 18947 152191746 fd Linux raid autodetect
/dev/sdb2 18948 19457 4096575 82 Linux swap / Solaris

Disk /dev/md0: 155.8 GB, 155844280320 bytes
2 heads, 4 sectors/track, 38047920 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn't contain a valid partition table

check dmesg / /var/log/messages for details of what happened when the array was attempted to be started.

md: md0 stopped.
md: bind<sda1>
md: bind<sdb1>
md: kicking non-fresh sda1 from array!
md: unbind<sda1>
md: export_rdev(sda1)
raid1: raid set md0 active with 1 out of 2 mirrors

mdadm /dev/md0 -a /dev/sda1
and then check this by;
mdadm -D /dev/md0

I have this messages from 'dmesg':

ata3.00: error: { UNC }
ata3.00: configured for UDMA/133
sd 2:0:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sd 2:0:0:0: [sda] Sense Key : Medium Error [current] [descriptor]
Descriptor sense data with sense descriptors (in hex):
72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00
11 dd 14 0f
sd 2:0:0:0: [sda] Add. Sense: Unrecovered read error - auto reallocate failed
end_request: I/O error, dev sda, sector 304383551
printk: 4 messages suppressed.
Buffer I/O error on device sda1, logical block 76095872
ata3: EH complete
sd 2:0:0:0: [sda] 312581808 512-byte hardware sectors (160042 MB)
sd 2:0:0:0: [sda] Write Protect is off
sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 2:0:0:0: [sda] 312581808 512-byte hardware sectors (160042 MB)
sd 2:0:0:0: [sda] Write Protect is off
sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0



And i have this message from 'smartctl':

Error 71 occurred at disk power-on lifetime: 0 hours (0 days + 0 hours)
When the command that caused the error occurred, the device was in an unknown state.

After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
00 00 00 00 00 00 00

Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
00 00 00 00 00 fd 00 00 00:00:00.000 NOP [Abort queued commands]
00 00 7f ff 00 00 00 00 00:00:00.000 NOP [Abort queued commands]
00 00 00 00 00 00 00 00 00:00:20.736 NOP [Abort queued commands]



Do someone know what is it saying?