On Fri, Aug 27, 2010 at 05:51:38AM -0700, David Magda wrote: > On Fri, August 27, 2010 08:46, Eff Norwood wrote: > > Saso is correct - ESX/i always uses F_SYNC for all writes and that is for > > sure your performance killer. Do a snoop | grep sync and you'll see the > > sync write calls from VMWare. We use DDRdrives in our production VMWare > > storage and they are excellent for solving this problem. Our cluster > > supports 50,000 users and we've had no issues at all. Do not use an SSD > > for the ZIL - as soon as it fills up you will be very unhappy. > > What do you mean by "fills up"? There is very a very limited amount of > data that is written to a slog device: between 5-30s second's worth. > Furthermore a log device will at maximum be <= 50% the size of physical > memory.
I would second this. Excellent results here with "small" 32GB Intel X-25E's. Even 32GB is overkill for ZIL .... Ray _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
