Re: SSD based sw RAID: is ERC/TLER really important?

On 24/07/21 22:45, Phil Turmel wrote:

I don't have data on SSD behavior without ERC.  If their retry cycle is
exhausted within the kernel default 30 seconds, the timeout mismatch
issue will *not* apply.

I've also seen stuff that implies (with spinning rust) that the retry
cycle can hang - a read times out, then the next attempt to read the
same data works fine.

It's *possible* the same applies to SSDs, in which case shortening the
timeout could be worthwhile.

And as Phil says, the critical fact is that the drive MUST come back
from la-la-land BEFORE the kernel times out.

Cheers,
Wol