On Mon, Feb 28 at 0:30, Toby Thain wrote:
I would expect COW puts more pressure on near-full behaviour compared to write-in-place filesystems. If that's not true, somebody correct me.
Off the top of my head, I think it'd depend on the workload. Write-in-place will always be faster with large IOs than with smaller IOs, and write-in-place will always be faster than CoW with large enough IO because there's no overhead for choosing where the write goes (and with large enough IO, seek overhead ~= 0) With CoW, it probably matters more what the previous version of the LBAs you're overwriting looked like, plus how fragmented the free space is. Into a device with plenty of free space, small writes should be significantly faster than write-in-place. --eric -- Eric D. Mudama edmud...@bounceswoosh.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
