On 10.05.2014 19:06, Keith Keller wrote:
On 2014-05-10, CS_DBA cs_dba@consistentstate.com wrote:
If we loose a drive in a raid 10 array (mdadm software raid) what are the steps needed to correctly do the following:
- identify which physical drive it is
This is controller dependent. Some support blinking the drive light to identify it, others do not. If yours does not you need to jury-rig something (e.g., either physically label the drive slot/drive, or send some dummy data to the drive to get it to blink).
This can also be inverted especially if you cannot send data to the drive anymore because it dies completely: Create lots of disk i/o with a command like "grep -nri test /usr" and all drives except the broken one should show activity.
Another way is to write down the serial numbers of the disks, the slots you put the disks in and then use hdparm -I /dev/sdX to find which device shows which serial number. That way once sdX dies you can check the list to find which slot the disk for the failed device was put in.
Regards, Dennis