On Tue, Jul 27, 2010 at 12:47:31PM -0700, Garrett D'Amore wrote: > I'm really confused here. Why run in an emulation mode at all? It > seems like we can align and use 4K blocks directly, then we should > *always* do so - at least for those devices which have a 4K physical > block size. The "emulated" block size might be helpful for legacy OS, > but we can do better, can't we? > > Is there a reason that this we would ever, under normal circumstances, > want to use RMW on these devices? Is there a reason that this should > even be exposed as a tunable to customers?
Probably when accessing UFS, FAT, and other such filesystems. But I don't get why this needs to be a tunable either, at least for ZFS, since we could ensure that ZFS always does 4KB aligned writes, and then who cares if UFS, FAT, and friends run slow on flash. Nico -- _______________________________________________ opensolaris-arc mailing list opensolaris-arc@opensolaris.org
