On Tue, 18 May 2010, Philippe wrote:
The 4 disks are Western Digital ATA 1TB (one is slighlty different) : 1 x ATA-WDC WD10EACS-00D-1A01-931.51GB 3 x ATA-WDC WD10EARS-00Y-0A80-931.51GBI've done lots of tests (speed tests + SMART reports) with each of these 4 disk on another system (another computer, running Windows 2003 x64), and everything was fine ! The 4 disks operate well, at 50-100 MB/s (tested with Hdtune). And the access time : 14ms The controller is an LSI Logic SAS 1068-IR (MPT BIOS 6.12.00.00 - 31/10/2006) Here are some stats : extended device statistics device r/s w/s kr/s kw/s wait actv svc_t %w %b sd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 sd1 8.6 0.0 1096.2 0.0 0.0 0.3 29.7 0 1 sd2 0.2 4.8 10.7 267.2 0.0 0.0 7.8 0 0 sd3 0.2 5.5 6.8 268.2 0.0 0.6 107.0 0 3 sd4 0.2 9.1 11.0 265.4 0.0 6.3 678.4 0 21 sd5 0.2 21.4 6.8 104.5 0.0 31.6 1467.8 0 92
It looks like your 'sd5' disk is performing horribly bad and except for the horrible performance of 'sd5' (which bottlenecks the I/O), 'sd4' would look just as bad. Regardless, the first step would be to investigate 'sd5'. If 'sd4' is also a terrible performer, then resilvering a disk replacement of 'sd5' may take a very long time.
Use 'iostat -xen' to obtain more information, including the number of reported errors.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
