On Wed, May 20, 2020 at 3:02 PM Johannes Hirte <johannes.hirte@xxxxxxxxxxxxx> wrote: > > On 2020 Mai 19, Zygo Blaxell wrote: > > > > Corollary: Never use space_cache=v1 with raid5 or raid6 data. > > space_cache=v1 puts some metadata (free space cache) in data block > > groups, so it violates the "never use raid5 or raid6 for metadata" rule. > > space_cache=v2 eliminates this problem by storing the free space tree > > in metadata block groups. > > > > This should not be a real problem, as the space-cache can be discarded > and rebuild anytime. Or do I miss something? The bitmap locations for the free space cache are referred to in the extent tree. It's not as trivial update or drop the v1 space cache as it is the v2 which is in its own btree. -- Chris Murphy
