Our experience has been that a new out of the box SSD works well for the ZIL but as soon as it's completely full, performance drops to slower than a regular SAS hard drive due to the write performance penalty in their fundamental design, their LBA map strategy and the not yet released (to me at least) TRIM support in OpenSolaris. Considering this, we only use (safe) DRAM based products for our ZILs like the DDRDrive X1 which is incredible. For the L2ARC, SSDs are ok but again, once they are full you still incur the write performance penalty when writing to it so you can read from it which is also slower than a regular SAS drive in some cases. More RAM costs more but works better.
I would recommend that you test not just initially but for at least a week. That should give you time to fill up the drive and see what I call its "native" performance which means how fast it can do the read-erase-write operation under full load. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
