On Sun, November 4, 2007 1:51 pm, Timo Sirainen wrote:
On Sun, 2007-11-04 at 13:02 +0100, mikkel@euro123.dk wrote:
Write activity is about half that of read activity when measuring throughput. But when measuring operations itâs about 5-7 times as high (measured with zpool iostat on ZFS).
Have you tried with fsync_disable=yes? ZFS's fsyncing performance apparently isn't all that great. I'm guessing this is also the reason for the I/O stalls in your other mail.
I'm using fsync_disable=yes already. I know ZFS has issues. In my opinion it was never ready when it was released but it has such nice features Im trying to cope with its specialities. I've also disabled "flush cache requests" in ZFS since it made the performance horrible.
If Im the only one experiencing this then I guess I'll just have to accept it as yet another ZFS curiosity :|
(Possibly this is also the answer to my other post regarding stalled/delayed I/O)
- Mikkel