HI, The question is a ZFS performance question in reguards to SAN traffic.
We are trying to benchmark ZFS vx VxFS file systems and I get the following performance results. Test Setup: Solaris 10: 11/06 Dual port Qlogic HBA with SFCSM (for ZFS) and DMP (of VxFS) Sun Fire v490 server LSI Raid 3994 on backend ZFS Record Size: 128KB (default) VxFS Block Size: 8KB(default) The only thing different in setup for the ZFS vs. VxFS tests is the file system and an array support module (ASM) module was installed for the RAID on the VxFS test case. Test Case: Run 'iostat', then write a 1GB file using 'mkfile 1g testfile' and then run iostat again. ZFS Test Results: The KB written per second averaged around 250KB. VxFS Test Results: The KB written per second averaged around 70KB. When I fixed the ZFS record size to 8KB the KB written per second averaged 110KB. My questions by be too general to answer here but I thought I would try. Why does ZFS write more traffic to disk then VxFS? Why does ZFS write more traffic to disk when the Record Size is variable instead of fixed in size? Thanks, ljs This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
