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Forum Discussion
SATA SSD's - Are Disk Scrub and Disk Test necessary?
RN528X, freshly repopulated with 8 Crucial 4TB MX500 SATA SSD's. With guidance from StephenB , I set up the NAS to perform each of the 4 Maintenance tasks once per quarter (Scrub, Disk Test, Def...
jimk1963 wrote:
Question: with SATA SSD's, is it advisable or not advisable to run all 4 of these maintenance tasks on this schedule? I've read that Disk Test and Disk Scrub in particular can shorten an SSD's life, but seems anecdotal.
SSDs all have a limited number of writes cycles ("endurance").
The Disk Test only does reads (running the smartctl long test), so that will not shorten the SSD life.
The Disk Scrub is a combination of a mdadm scrub and a btrfs scrub. The man page for btrfs scrub suggests that it only writes to repair errors. That is not something I've tried to confirm. As far as the mdadm scrub goes, I think that is verifying the parity blocks (and only rewriting ones that are wrong). But it is possible that it is actually recomputing and rewriting all the partity blocks.
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