On Thu, 2019-01-10 at 12:52 +0100, Zdenek Kabelac wrote: > Dne 10. 01. 19 v 12:40 Martin Wilck napsal(a): > > > > So far my understanding was that even without zeroing, an LVM > thin > > volume could be considered as a drive with "discard zeroes data" > > property. If there's a flaw in the argument below, please point it > > out > > to me. > > > > As said - if you discard 'less then aligned' chunk - nothing happens, > so it cannot be takes as like it would be always zeroing... Yuck, that's the Catch-22 then. Sorry for having missed that on the first pass. Wouldn't it be wise to fail discard (or only zeroout?) requests which aren't chunk-aligned, rather than just doing nothing? I for one would find it very attractive if dm-thin had a mode supporting fast zeroout. Martin -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
