> From: Roy Sigurd Karlsbakk [mailto:r...@karlsbakk.net] > Sent: Saturday, July 09, 2011 3:44 PM > > Sorry, my bad, I meant L2ARC to help buffer the DDT
Also, bear in mind, the L2ARC is only for reads. So it can't help accelerate writing updates to the DDT. Those updates need to hit the pool, period. Yes, on test 1 and test 2, there were significant regions where reads were taking place. (Basically the whole test, approx 25% to 30% reads.) On test 3, there were absolutely no reads up till 75M entries (9.07 T used) arc_meta_used= 12960 MB. Up to this point, it was a 4x write performance degradation. Then it suddenly started performing about 5% reads and 95% writes and suddenly jumped to 6x write performance degradation. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
