Understanding the S.M.A.R.T. values from a Synology 1812+ device

Solution 1:

the raw data column usually represents the number of events happened. E.g., number of read errors in the first row. However, your numbers are so high, that I assume you have a Seagate drive, which always reports abnormal high raw error values (also when hard drive is OK).

What else you can see - Status column. It is OK for all parameters, which means exactly the same - your drive is generally OK.

As written at http://www.linuxjournal.com/node/6983/print, the VALUE column presents a current "normalized value", which should be always greater than threshold.

So your SMART data shows that all drives are OK. However, if you get a lot of read errors (not just one found in the logs for last year:), it seems that your drive are going to die soon. It's somehow "normal" to have several (up to 1-2 thousand, see How many SMART sector reallocations indicate problems?) bad sectors on the drive which will be replaced with other and therefore corrected. But if you have too many of such messages or they come very often, you should replace your drive.

You can probably make SMART tests or some other tests (both depends on your NAS)... E.g., if you have smartctl and can login into NAS via ssh, you could try:

# smartctl -t short /dev/<device>

This command will run a short test for selected drive. After it will be finished, you could veiw results with

# smartctl -H /dev/<device>
# smartctl -l selftest /dev/<device>