Change NAS to all flash a good idea?

So far, untested.

To refresh cells requires not just a read/patrol operation (as done in scrubs) but also a write operation (only done during a scrub if data does not match metadata and is available elsewhere in the array)

Ideally the data is read from disk into memory, then written back, then read again with checksumming at each step to maintain integrity.

You’ll add 1 full disk write every cycle, but would keep the data fresh and with modern SSD write endurance: should not be a problem unless ran daily.

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