On 04/11/19 20:01, Nigel Croxon wrote: > The MD driver for level-456 should prevent re-reading read errors. > > For redundant raid it makes no sense to retry the operation: > When one of the disks in the array hits a read error, that will > cause a stall for the reading process: > - either the read succeeds (e.g. after 4 seconds the HDD error > strategy could read the sector) > - or it fails after HDD imposed timeout (w/TLER, e.g. after 7 > seconds (might be even longer) Okay, I'm being completely naive here, but what is going on? Are you saying that if we hit a read error, we just carry on, ignore it, and calculate the missing block from parity? If so, what happens if we hit two errors on a raid-5, or 3 on a raid-6, or whatever ... :-) Cheers, Wol
