On Jan 31, 2010, at 9:39 PM, Anatoly wrote: > Yes, it has battery-backed cache and it's working fine. > I'm worried about fact that simple > dd if=/dev/zero of=/zpool1 bs=8192k count=10240 > gives 40MB/s in zpool iostat > > Maybe Oracle settings are wrong? > Current settings are: > filesystemio_options=asynch > db_writer_processes=2 > db_file_multiblock_read_count=8 > Does ZFS support DirectIO and/or asynchronous writes like UFS?
UFS directio is often misunderstood. The features implemented with UFS directio usually fixed the ancient (~30 years old) design deficiencies in UFS. The ZFS design team was well aware of the need for the UFS directio features and took appropriate action. See slide 144 at http://www.slideshare.net/relling/zfs-tutorial-usenix-lisa09-conference -- richard _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
