On Mar 2, 2010, at 12:36 PM, Edward Ned Harvey wrote: > I have a system with a bunch of disks, and I’d like to know how much faster > it would be if I had an SSD for the ZIL; however, I don’t have the SSD and I > don’t want to buy one right now. The reasons are complicated, but it’s not a > cost barrier. Naturally I can’t do the benchmark right now... > > But if I could create a RAM device, and use that for ZIL, of course it would > be irresponsible, but I have no data on the system yet, and this is all just > to establish the upper bound of what performance could be if I had the SSD. > After doing the benchmark, I would reformat the machine anyway. > > Can I create a ram device and use it for the ZIL?
Yes, see ramdiskadm(1m) > Can I somehow disable the ZIL in an irresponsible way, to establish the upper > bound for performance on my system? Yes, but performance achieved by disabling the ZIL is always better, so it seems like an unachievable goal. -- richard ZFS storage and performance consulting at http://www.RichardElling.com ZFS training on deduplication, NexentaStor, and NAS performance http://nexenta-atlanta.eventbrite.com (March 16-18, 2010) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
