I have a Server with 2 HDDs in soft RAID 1, the OS is Debian Wheezy. After some database testing, the file system has gone to read-only mode, after which I have rebooted the machine. The server is not starting again, so I have booted a rescue system to look after the HDDs.
Now the problems start:
fdisk -l is giving no output, and
fdisk /dev/sda says
Unable to read /dev/sda, while
smartctl -a gives me a
SMART overall-health self-assessment test result: PASSED. All the problems occur with /dev/sdb as well.
mdadm isn't helpful as well:
mdadm: no recogniseable superblock on /dev/sda mdadm: /dev/sda has no superblock - assembly aborted
ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 ata5.00: irq_stat 0x40000001 ata5.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in res 61/04:08:00:00:00/00:00:00:00:00/e0 Emask 0x1 (device error) ata5.00: SB600 AHCI: limiting to 255 sectors per cmd ata5.00: SB600 AHCI: limiting to 255 sectors per cmd ata5.00: configured for UDMA/133 ata5: EH complete
testdisk is listing the drives with the correct size, but when I am trying to test the disk, every block is return a read error:
... file_pread(4,2,buffer,34(0/0/35)) read err: Input/output error file_pread(4,8,buffer,32(0/0/33)) read err: Input/output error file_pread(4,8,buffer,40(0/0/41)) read err: Input/output error file_pread(4,3,buffer,48(0/0/49)) read err: Input/output error ...
I am a bit puzzled, because I doubt that both disks have died at the same time and I suspect, that the SATA-controller may have some problems. How can I test this? And what else can I check?