I have an HP DL380p Gen8 running Ubuntu 14.04 and apparently it's been having some trouble with its RAID10 filesystem for almost a month, despite everything seeming to be okay otherwise. I'm seeing a lot of these messages in dmesg
/syslog
/etc. though the hex values in the Read lines do vary a bit.
Nov 18 08:09:25 server03 kernel: sd 2:0:0:1: [sdb]
Nov 18 08:09:25 server03 kernel: Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Nov 18 08:09:25 server03 kernel: sd 2:0:0:1: [sdb]
Nov 18 08:09:25 server03 kernel: Sense Key : Medium Error [current]
Nov 18 08:09:25 server03 kernel: sd 2:0:0:1: [sdb]
Nov 18 08:09:25 server03 kernel: Add. Sense: Unrecovered read error
Nov 18 08:09:25 server03 kernel: sd 2:0:0:1: [sdb] CDB:
Nov 18 08:09:25 server03 kernel: Read(16): 88 00 00 00 00 03 f8 48 f5 38 00 00 00 80 00 00
The iLO and hpssacli both report all disks are fine and the filesystem is not read-only. The /dev/sdb device is a RAID10 using the server's RAID controller, consisting of 20 x 900 GB disks.
This is a production server and while I've rebooted it once to try to clear this up, I'm reluctant to try an fsck without trying to determine what these messages mean when there are no other apparent issues.
So, any thoughts on what might be wrong here?