health-check external disk

Hard disk health is measured using S.M.A.R.T. (if available) and bad blocks scan.
  1. Hard disk and docking station need to support S.M.A.R.T.
  2. For S.M.A.R.T., smartmontools is needed.
  3. On (QNAP) NAS, install Entware.
  4. ssh on NAS.
  5. Install smartmontools: opkg install smartmontools.
  6. Connected the external device.
  7. run dmesg to see dev address of the external device.
    Output will look something like this:
    [..]
    sd 13:0:0:0: [sdi] Spinning up disk...
    [798870.006728] sd 13:0:0:0: Attached scsi generic sg8 type 0
    [798871.003044] ............ready
    [798882.053671] sd 13:0:0:0: [sdi] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
    [798882.058613] sd 13:0:0:0: [sdi] Write Protect is off
    [..]

    Here, the device address is /dev/sdi.
  8. Get S.M.A.R.T. error log: # smartctl /dev/sdi -l error
  9. Start a short self test: # smartctl /dev/sdi -t short
  10. Start a long self test: # smartctl /dev/sdi -t long
  11. Run bad blocks scan: badblocks -n /dev/sdi
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