On Fri, 5 Feb 2010, Miles Nordin wrote:
ls> r...@nexenta:/volumes# hdadm write_cache off c3t5 ls> c3t5 write_cache> disabled You might want to repeat his test with X25-E. If the X25-E is also dropping cache flush commands (it might!), you may be, compared to disabling the ZIL, slowing down your pool for no reason, and making it more fragile as well since an exported pool with a dead ZIL cannot be imported.
Others have tested the X25-E and found that with its cache enabled, it does drop flushed writes, but is clearly not such a gaping chasm as the X25-M. Some time has passed so there is the possibility that X25-E firmware has (or will) improve. If Sun offers an X25-E based device for use as an slog, you can be sure that its has been qualified for this purpose, and may contain modified firmware.
The 'E' stands for "Extreme" and not "Enterprise" as some tend to believe.
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
