On 08 September, 2010 - Fei Xu sent me these 5,9K bytes: > I dig deeper into it and might find some useful information. > I attached an X25 SSD for ZIL to see if it helps. but no luck. > I run IOstate -xnz for more details and got interesting result as > below.(maybe too long) > some explaination: > 1. c2d0 is SSD for ZIL > 2. c0t3d0, c0t20d0, c0t21d0, c0t22d0 is source pool. ... > extended device statistics > r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device > 0.3 0.0 1.2 0.0 0.0 0.0 0.0 0.1 0 0 c2d0 > 0.1 17.7 0.1 51.7 0.0 0.1 0.2 4.1 0 7 c3d0 > 0.1 2.1 0.0 79.8 0.0 0.0 0.1 4.0 0 0 c0t2d0 > 0.2 0.0 7.1 0.0 0.1 2.3 278.5 11365.1 1 46 c0t3d0
Service time here is crap. 11 seconds to reply. > 0.1 2.2 0.0 79.9 0.0 0.0 0.1 3.7 0 0 c0t5d0 > 0.1 2.3 0.0 80.0 0.0 0.0 0.1 9.2 0 0 c0t6d0 > 0.1 2.5 0.0 80.1 0.0 0.0 0.1 3.8 0 0 c0t10d0 > 0.1 2.4 0.0 80.0 0.0 0.0 0.1 9.5 0 0 c0t11d0 > 1.9 0.0 133.0 0.0 0.1 2.8 60.2 1520.6 2 51 c0t20d0 1.5 seconds to reply. crap. > extended device statistics > r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device ... > 0.7 0.0 39.1 0.0 0.0 0.6 64.0 884.1 1 10 c0t3d0 ... > 2.1 0.0 135.8 0.0 0.1 5.2 67.8 2498.1 3 88 c0t21d0 ... > extended device statistics > r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device ... > 3.5 0.0 246.8 0.0 0.0 0.8 6.3 229.8 1 20 c0t3d0 ... > 0.7 0.0 29.2 0.0 0.0 0.6 0.0 911.0 0 12 c0t21d0 > 1.9 0.0 138.7 0.0 0.1 4.7 73.0 2428.6 2 66 c0t22d0 ... Service times here are crap. Disks are malfunctioning in some way. If your source disks can take seconds (or 10+ seconds) to reply, then of course your copy will be slow. Disk is probably having a hard time reading the data or something. /Tomas -- Tomas Ögren, st...@acc.umu.se, http://www.acc.umu.se/~stric/ |- Student at Computing Science, University of Umeå `- Sysadmin at {cs,acc}.umu.se _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
