On Tue, 23 Sep 2014 19:07:35 -0400 "Martin K. Petersen" <martin.petersen@xxxxxxxxxx> wrote: > >>>>> "Heinz" == heinzm <heinzm@xxxxxxxxxx> writes: > > Heinz> In case of RAID levels 4,5 and 6 we have to check for the > Heinz> capability to zero data on discards to avoid stripe data > Heinz> corruption. > > I'm quite concerned about relying on discard_zeroes_data since it's a > hint and not a hard guarantee. > If it is a "hint", then why isn't it "discard_sometimes_zeroes_data"? md/raid5 already depends on this. If a read from a discarded region doesn't reliably return zeros, then raid5 cannot support discard. Should I turn of discard support in raid5? Also, could you help my understand when such a hint-but-no-guarantee would be useful? Thanks, NeilBrown
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