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lsscsito list things. It looks likelsblkhas a-aoption which shows empty drives. Depending on how it is failing, maybe that would show some other drives? Once you identify the failing drive, you can usehdparm -i /dev/sdato get it to print out the serial, etc., which hopefully corresponds to stuff printed on a physical label on the drive.cat /var/log/syslog | grep kernel | grep '/dev/sd\|/dev/zd'to filter for any error messages being reported by disks. You say you are being told you have failing disks; by who or what? If it is unable to tell you which disk and why, it isn't exactly a reliable source.