Hi Wayne, I see you're using a 3.6 kernel. Could I trouble you to try with 3.14 please? Mike Snitzer wrote a very nice patch recently that implements a separate deferred list for each thin device, and then sorts individual bios using a btree. https://github.com/jthornber/linux-2.6/commit/67324ea18812bc952ef96892fbd5817b9050413f - Joe On Mon, May 12, 2014 at 05:03:39PM +0800, Wayne Chou wrote: > Hello, > > I am using 4 drives to construct a RAID5 and build a thin > volume on it. To get better performance, I use '-Zn' option > in 'lvcreate' to make the thin pool assume all blocks are > already zeroed. The chunk size in RAID5 and thin-pool are > both 512KB and the stripe_cache_size=4096 on RAID5. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
