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. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
