How to Monitor NAS Disk Health

Disks give warnings before many failures. Here is what to watch on a NAS, what the values suggest and how to turn them into alerts.

Check the basics first

• Disk status in each bay
• S.M.A.R.T. overall health result
• Reallocated, pending and uncorrectable sector counts
• Disk temperature
• Power-on hours

What the values suggest

Value	Typical meaning
Reallocated sectors rising	Surface wear; plan to replace
Pending sectors	Unstable sectors; replace soon
High temperature	Cooling or airflow issue
Disk offline	Array may be degraded

How often to check

Manually checking each NAS daily is not realistic. Automated polling every few minutes with alerts on change is better. Run a S.M.A.R.T. extended test periodically if your NAS supports scheduling.

Limits of S.M.A.R.T.

S.M.A.R.T. catches many gradual failures but not all. Some drives fail suddenly. Keep RAID and tested backups.

Automate it

A tool such as NexoraNAS disk health monitoring reads values from your devices through SNMP or an API and sends alerts.

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