On Oct 3, 2007, at 5:21 PM, Richard Elling wrote: > Slightly off-topic, in looking at some field data this morning > (looking > for something completely unrelated) I notice that the use of directio > on UFS is declining over time. I'm not sure what that means... > hopefully > not more performance escalations...
Sounds like someone from ZFS team needs to get with someone from Oracle/MySQL/Postgres and get the skinny on how the IO rubber->road boundary should look, because it doesn't sound like there's a definitive or at least a sure answer here. Oracle trumpets the use of DIO, and there are benchmarks and first- hand accounts out there from DBAs on its virtues - at least when running on UFS (and EXT2/3 on Linux, etc) As it relates to ZFS mechanics specifically, there doesn't appear to be any settled opinion. /dale _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
