Robert Milkowski writes: > Hello Roch, > > Friday, May 12, 2006, 2:28:59 PM, you wrote: > > RBPE> Hi Robert, > > RBPE> Could you try 35 concurrent dd each issuing 128K I/O ? > RBPE> That would be closer to how ZFS would behave. > > You mean to UFS? > > ok, I did try and I get about 8-9MB/s with about 1100 IO/s (w/s). > > But what does it proof?
It does not prove my point at least. Actually I also tried it and it does not generate the I/O pattern that ZFS uses; I did not analyze this but UFS gets in the way. I don't have a raw device to play with at this instant but what we (I) have to do is find the right script that will cause 35 concurrent 128K I/O to be dumped into a spindle repeateadly. They can be as random as you like. This, I guarantee you, will saturate your spindle (or get really close to it). And this is the I/O pattern that ZFS generates during a pool sync operation. -r _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
