Today the disks for my new ZFS NAS arrived, rejoice! 😍
Now I ask myself: If some day one of the drives fails, how am I supposed know which of the physical ones it is? My preliminary plan is to plug them into to disk container one by one, writing down the newly appearing blkids and labeling the corresponding drive. This is somewhat time consuming, so you folks have a better idea?
Cheers!
A rather more sophisticated way to identify a disk, if it’s in an enclosure that has ID LEDs, is to use sg_ses.
The rough process for that is:
lsscsi -g
to get the generic SCSI device (/dev/sgN
) for the enclosure.lsscsi -t
to get the SAS address for a disk. (Not sure whether this will work if it’s a SATA enclosure; all of mine are SAS.)sg_ses -p aes /dev/sgN | less
, where/dev/sgN
is the enclosure’s generic SCSI device. Look through the output to find the SAS address and, from that, get the index number of the disk.sg_ses --set ident --index I /dev/sgN
, whereI
is the disk index number and/dev/sgN
is the enclosure’s device. This will turn on the ID LED for the disk.sg_ses --clear ident --index I /dev/sgN
to turn the LED off.You can also use
fault
instead ofident
to turn on the “drive fault” LED, in case the enclosure has those but not ID LEDs.