On Mon, 19 Apr 2010, Don wrote:
I'm curious if anyone knows how ZIL slog performance scales. For example- how much benefit would you expect from 2 SSD slogs over 1? Would there be a significant benefit to 3 over 2 or does it begin to taper off? I'm sure a lot of this is dependent on the environment- but rough ideas are good to know.
I don't know the answer but I expect that the answer depends quite a lot on the nature of the SSDs used. A STEC Zeus IOPS SSD (45K IOPS) will behave quite differently than an Intel X-25E (~3.3K IOPS). A SRAM or DRAM-based "drive" (with FLASH backup) will behave dramatically differently than a typical SSD.
If the SSD employed supports sufficient IOPS and bandwidth, then adding more will not help since it is not the bottleneck.
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
