On Tue, Nov 27, 2012 at 12:12:43PM +0000, Edward Ned Harvey (opensolarisisdeadlongliveopensolaris) wrote: > > From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > > boun...@opensolaris.org] On Behalf Of Eugen Leitl > > > > can I make e.g. LSI SAS3442E > > directly do SSD caching (it says something about CacheCade, > > but I'm not sure it's an OS-side driver thing), as it > > is supposed to boost IOPS? Unlikely shot, but probably > > somebody here would know. > > Depending on the type of work you will be doing, the best performance thing > you could do is to disable zil (zfs set sync=disabled) and use SSD's for > cache. But don't go *crazy* adding SSD's for cache, because they still have > some in-memory footprint. If you have 8G of ram and 80G SSD's, maybe just > use one of them for cache, and let the other 3 do absolutely nothing. Better > yet, make your OS on a pair of SSD mirror, then use pair of HDD mirror for > storagepool, and one SSD for cache. Then you have one SSD unused, which you > could optionally add as dedicated log device to your storagepool. There are > specific situations where it's ok or not ok to disable zil - look around and > ask here if you have any confusion about it. > > Don't do redundancy in hardware. Let ZFS handle it.
Thanks. I'll try doing that, and see how it works out. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
