Health-Check External Disk

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  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`.
  1. Get S.M.A.R.T. error log: # smartctl /dev/sdi -l error.

  2. Start a short self test: # smartctl /dev/sdi -t short.

  3. Start a long self test: # smartctl /dev/sdi -t long.

  4. Run bad blocks scan: badblocks -n /dev/sdi. Tip: use tmux (opkg install tmux) to keep process alive after exiting the terminal.