That's my understanding too. One (STEC?) drive as a write cache, basically a write optimised SSD. And cheaper, larger, read optimised SSD's for the read cache.
I thought it was an odd strategy until I read into SSD's a little more and realised you really do have to think about your usage cases with these. SSD's are very definitely not all alike. On Fri, Jan 23, 2009 at 4:33 PM, Greg Mason <gma...@msu.edu> wrote: > If i'm not mistaken (and somebody please correct me if i'm wrong), the Sun > 7000 series storage appliances (the Fishworks boxes) use enterprise SSDs, > with dram caching. One such product is made by STEC. > > My understanding is that the Sun appliances use one SSD for the ZIL, and one > as a read cache. For the 7210 (which is basically a Sun Fire X4540), that > gives you 46 disks and 2 SSDs. > > -Greg > > > Bob Friesenhahn wrote: >> >> On Thu, 22 Jan 2009, Ross wrote: >> >>> However, now I've written that, Sun use SATA (SAS?) SSD's in their high >>> end fishworks storage, so I guess it definately works for some use cases. >> >> But the "fishworks" (Fishworks is a development team, not a product) write >> cache device is not based on FLASH. It is based on DRAM. The difference is >> like night and day. Apparently there can also be a read cache which is based >> on FLASH. >> >> Bob >> ====================================== >> Bob Friesenhahn >> bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ >> GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ >> >> _______________________________________________ >> zfs-discuss mailing list >> zfs-discuss@opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >> >> > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
