Hi; You may be hitting a bottleneck at your HBA. Try using multiple HBA's or drive channels Mertol
Mertol Ozyoney Storage Practice - Sales Manager Sun Microsystems, TR Istanbul TR Phone +902123352200 Mobile +905339310752 Fax +902123352222 Email mertol.ozyo...@sun.com -----Original Message----- From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-boun...@opensolaris.org] On Behalf Of en...@businessgrade.com Sent: Monday, August 31, 2009 5:16 PM To: zfs-discuss@opensolaris.org Subject: [zfs-discuss] ZFS read performance scalability Hi. I've been doing some simple read/write tests using filebench on a mirrored pool. Essentially, I've been scaling up the number of disks in the pool before each test between 4, 8 and 12. I've noticed that for individual disks, ZFS write performance scales very well between 4, 8 and 12 disks. This may be due to the fact that I'm using a SSD as a logging device. But I'm seeing individual disk performance drop by as much as 14MB per disk between 4 and 12 disks. Across the entire pool that means I've lost 168MB of raw throughput just by adding two mirror sets. I'm curious to know if there are any dials I can turn to improve this. System details are below: HW: Dual Quad Core 2.33 Xeon 8GB RAM Disks: Seagate Savio 10K 146GB and LSI 1068e HBA latest firmware OS: SCXE snv_121 Thank in advance.. ---------------------------------------------------------------------------- ---- This email and any files transmitted with it are confidential and are intended solely for the use of the individual or entity to whom they are addressed. This communication may contain material protected by the attorney-client privilege. If you are not the intended recipient, be advised that any use, dissemination, forwarding, printing or copying is strictly prohibited. If you have received this email in error, please contact the sender and delete all copies. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
