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