quoted

We have a linux RAID 5 md setup with 10 disks controlled using a 3ware
9650se card. Here is /proc/mdstat:

quoted

Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdb1[0] sdk1[9] sdj1[8] sdi1[7] sdh1[6] sdg1[5] sdf1[4]
sde1[3] sdd1[2] sdc1[1]

    >> 8788959360 blocks level 5, 32k chunk, algorithm 2 [10/10] [UUUUUUUUUU]
Above the Raid Configuration. (Cut and Paste and other info)

3w-9xxx: scsi4: ERROR: (0x03:0x0202): Drive ECC error:port=8.
sd 4:0:8:0: [sdj] Unhandled sense code
sd 4:0:8:0: [sdj] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sd 4:0:8:0: [sdj] Sense Key : Medium Error [current]
sd 4:0:8:0: [sdj] Add. Sense: Unrecovered read error

3ware 9650se card/check whether the drive on sdj is plugged in properly.
since the error is  sd 4:0:8:0: [sdj] Unhandled sense code. Probably an jumper.
But why does the error come up as read error. Is the read error given priority/
precedence over write error in the hardware?

end_request: I/O error, dev sdj, sector 1953102848
3w-9xxx: scsi4: ERROR: (0x03:0x0202): Drive ECC error:port=8.
sd 4:0:8:0: [sdj] Unhandled sense code
sd 4:0:8:0: [sdj] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sd 4:0:8:0: [sdj] Sense Key : Medium Error [current]
sd 4:0:8:0: [sdj] Add. Sense: Unrecovered read error

3ware 9650se card. Same here.

end_request: I/O error, dev sdj, sector 1953102856
Buffer I/O error on device sdj, logical block 244137857
Buffer I/O error on device sdj, logical block 244137858
Buffer I/O error on device sdj, logical block 244137859
Buffer I/O error on device sdj, logical block 244137860
Buffer I/O error on device sdj, logical block 244137861
Buffer I/O error on device sdj, logical block 244137862
Buffer I/O error on device sdj, logical block 244137863
Buffer I/O error on device sdj, logical block 244137864
Buffer I/O error on device sdj, logical block 244137865
Buffer I/O error on device sdj, logical block 244137866

This is an read error as the disk is being added to the raid.
Here the sector and logical block is being looked for.

3w-9xxx: scsi4: ERROR: (0x03:0x0202): Drive ECC error:port=8.
sd 4:0:8:0: [sdj] Unhandled sense code
sd 4:0:8:0: [sdj] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sd 4:0:8:0: [sdj] Sense Key : Medium Error [current]
sd 4:0:8:0: [sdj] Add. Sense: Unrecovered read error
end_request: I/O error, dev sdj, sector 1953103080
3w-9xxx: scsi4: ERROR: (0x03:0x0202): Drive ECC error:port=8.
sd 4:0:8:0: [sdj] Unhandled sense code
sd 4:0:8:0: [sdj] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sd 4:0:8:0: [sdj] Sense Key : Medium Error [current]
sd 4:0:8:0: [sdj] Add. Sense: Unrecovered read error
end_request: I/O error, dev sdj, sector 1953103080
3w-9xxx: scsi4: ERROR: (0x03:0x0202): Drive ECC error:port=8.
sd 4:0:8:0: [sdj] Unhandled sense code
sd 4:0:8:0: [sdj] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sd 4:0:8:0: [sdj] Sense Key : Medium Error [current]
sd 4:0:8:0: [sdj] Add. Sense: Unrecovered read error

3ware 9650se card. Same Here.

end_request: I/O error, dev sdj, sector 1953103080
__ratelimit: 24 callbacks suppressed
Buffer I/O error on device sdj, logical block 244137885

Sector and block info.

3w-9xxx: scsi4: ERROR: (0x03:0x0202): Drive ECC error:port=8.
sd 4:0:8:0: [sdj] Unhandled sense code
sd 4:0:8:0: [sdj] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sd 4:0:8:0: [sdj] Sense Key : Medium Error [current]
sd 4:0:8:0: [sdj] Add. Sense: Unrecovered read error

Same here.

end_request: I/O error, dev sdj, sector 1953103080
Buffer I/O error on device sdj, logical block 244137885
md: requested-resync of RAID array md0
md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
md: using maximum available idle IO bandwidth (but not more than 200000
KB/sec) for requested-resync.
md: using 128k window, over a total of 976551040 blocks.
md: md0: requested-resync done.

is it printing out information regarding minimum/optimal speed/IO bandwidth
due to the an failed/partially failed device.

--
Jeremy Sanders [off-list ref]   http://www-xray.ast.cam.ac.uk/~jss/



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-- 
-- Sujit K M