В Чтв, 06/12/2007 в 21:36 +0300, Yuri Kozlov пишет: > 2007/12/5, Timur S. Sattarov <[EMAIL PROTECTED]>: > > При этом информацию от SMART я получить не могу: > > > > # smartctl --all /dev/sda > > smartctl version 5.36 [i686-pc-linux-gnu] Copyright (C) 2002-6 Bruce Allen > > Home page is http://smartmontools.sourceforge.net/ > > > > Device: ATA ST3120026AS Version: 8.05 > > Serial number: 3JT3RP2B > > Device type: disk > > Device does not support SMART > > запусти как > smartctl -d ata --all /dev/sda > > Кстати у меня похожий винт и raid1. > Model=ST3120026AS , FwRev=3.18 > Model=ST3120813AS , FwRev=3.AAH > Дают > $ sudo hdparm -tT --direct /dev/sda /dev/sdb /dev/md0 > > /dev/sda: > Timing O_DIRECT cached reads: 96 MB in 2.00 seconds = 47.99 MB/sec > Timing O_DIRECT disk reads: 166 MB in 3.03 seconds = 54.83 MB/sec > > /dev/sdb: > Timing O_DIRECT cached reads: 260 MB in 2.01 seconds = 129.65 MB/sec > Timing O_DIRECT disk reads: 166 MB in 3.01 seconds = 55.07 MB/sec > > /dev/md0: > Timing O_DIRECT cached reads: 80 MB in 2.00 seconds = 40.00 MB/sec > Timing O_DIRECT disk reads: 172 MB in 3.02 seconds = 56.87 MB/sec > > То есть в рейде чуть быстрее.
У меня в рейд 10 так: ------------------------------- # hdparm -Tt /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/md0 /dev/sdb: Timing cached reads: 2516 MB in 2.00 seconds = 1258.57 MB/sec Timing buffered disk reads: 182 MB in 3.03 seconds = 60.07 MB/sec /dev/sdc: Timing cached reads: 2402 MB in 2.00 seconds = 1201.08 MB/sec Timing buffered disk reads: 182 MB in 3.01 seconds = 60.40 MB/sec /dev/sdd: Timing cached reads: 2394 MB in 2.00 seconds = 1196.85 MB/sec Timing buffered disk reads: 184 MB in 3.01 seconds = 61.12 MB/sec /dev/sde: Timing cached reads: 2424 MB in 2.00 seconds = 1212.54 MB/sec Timing buffered disk reads: 176 MB in 3.03 seconds = 58.10 MB/sec /dev/md0: Timing cached reads: 2366 MB in 2.00 seconds = 1182.71 MB/sec Timing buffered disk reads: 294 MB in 3.00 seconds = 97.92 MB/sec ------------------------------- ------------------------------- # hdparm -Tt /dev/sdb >a & hdparm -Tt /dev/sdc >b [1] 8414 [1]+ Done hdparm -Tt /dev/sdb >a # cat a /dev/sdb: Timing cached reads: 1258 MB in 2.00 seconds = 628.90 MB/sec Timing buffered disk reads: 174 MB in 3.03 seconds = 57.51 MB/sec # cat b /dev/sdc: Timing cached reads: 1260 MB in 2.00 seconds = 630.04 MB/sec Timing buffered disk reads: 170 MB in 3.00 seconds = 56.60 MB/sec ------------------------------- ------------------------------- # hdparm -Tt /dev/sdb >a & hdparm -Tt /dev/sdc >b & hdparm -Tt /dev/sdd >c & hdparm -Tt /dev/sde >d [1] 8838 [2] 8839 [3] 8840 [1] Done hdparm -Tt /dev/sdb >a [2]- Done hdparm -Tt /dev/sdc >b [3]+ Done hdparm -Tt /dev/sdd >c # cat a b c d /dev/sdb: Timing cached reads: 602 MB in 2.01 seconds = 300.03 MB/sec Timing buffered disk reads: 170 MB in 3.00 seconds = 56.60 MB/sec /dev/sdc: Timing cached reads: 666 MB in 2.00 seconds = 333.02 MB/sec Timing buffered disk reads: 172 MB in 3.01 seconds = 57.08 MB/sec /dev/sdd: Timing cached reads: 618 MB in 2.00 seconds = 308.67 MB/sec Timing buffered disk reads: 160 MB in 3.09 seconds = 51.78 MB/sec /dev/sde: Timing cached reads: 628 MB in 2.00 seconds = 313.94 MB/sec Timing buffered disk reads: 158 MB in 3.07 seconds = 51.45 MB/sec ------------------------------- Так что винты почти друг другу не мешают, а рейд 10 почти в 2 раза быстрее одного винта. А вот шина делится, и это логично, но её на ~20 винтов хватит. Кстати, что интересно, во время теста 4-х винтов одновременно по показаниям atop 2-х ядерный Xeon максимум был занят на 100% из 200%, при этом 40% system и 60% iowait. -- Покотиленко Костик <[EMAIL PROTECTED]> -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
