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  1. #1
    Join Date
    Nov 2007
    Location
    India
    Posts
    843

    * I/O time is high

    before 24hrs i upgraded the processer to dual xenon 5410

    then the loadof the server increased to 3 to 35

    in top i seen increaded I/O wait time

    there top result

    top - 06:14:29 up 12:20, 4 users, load average: 21.62, 28.42, 26.09
    Tasks: 413 total, 2 running, 410 sleeping, 0 stopped, 1 zombie
    Cpu(s): 16.5%us, 3.6%sy, 0.0%ni, 42.0%id, 37.1%wa, 0.0%hi, 0.7%si, 0.0%st
    Mem: 4047448k total, 3999960k used, 47488k free, 31132k buffers
    Swap: 20972848k total, 3291744k used, 17681104k free, 494312k cached

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    739 nobody 25 0 252m 33m 4604 R 99.9 0.9 0:08.99 httpd
    4025 mysql 15 0 784m 47m 3692 S 9.6 1.2 43:56.51 mysqld
    761 nobody 15 0 240m 26m 4500 S 7.6 0.7 0:00.24 httpd
    339 root 10 -5 0 0 0 S 6.6 0.0 12:17.54 kswapd0
    775 nobody 16 0 224m 11m 4300 D 5.0 0.3 0:00.18 httpd
    20949 nobody 17 0 1558m 1.0g 1884 D 5.0 26.3 1:59.42 nginx
    826 nobody 16 0 224m 11m 4272 D 4.6 0.3 0:00.19 httpd
    24531 shivaco 15 0 172m 5636 1376 S 1.7 0.1 3:02.86 sc_trans
    753 nobody 16 0 224m 11m 4120 D 1.3 0.3 0:00.17 httpd
    20948 nobody 16 0 1564m 1.0g 1940 D 1.3 25.8 1:56.12 nginx
    352 nobody 16 0 225m 13m 5440 D 1.0 0.3 0:00.56 httpd
    716 nobody 16 0 224m 11m 4200 D 1.0 0.3 0:00.20 httpd
    818 nobody 16 0 220m 8948 3444 S 1.0 0.2 0:00.03 httpd
    32271 nobody 16 0 227m 16m 5824 D 1.0 0.4 0:13.88 httpd
    32610 nobody 16 0 224m 12m 5408 D 1.0 0.3 0:00.39 httpd
    714 nobody 16 0 223m 9612 4080 S 0.7 0.2 0:00.04 httpd
    722 nobody 16 0 222m 10m 3612 D 0.7 0.3 0:00.19 httpd
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  2. #2
    Join Date
    May 2006
    Location
    NJ, USA
    Posts
    6,456
    The process count is a bit high.
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  3. #3
    Join Date
    Jul 2009
    Posts
    178
    Just check out which are the processes doing high i/o using sar

  4. #4
    Join Date
    Nov 2007
    Location
    India
    Posts
    843
    thanks to Dougy he give me clue,on that server the DC added only 4GB ram insted of 16GB

    let me contact the DC for the RAM swap hope it may reslove it

    also another point is i swithed from nignx from apache it also helped me in reduce in load
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  5. #5
    Check the active Internet connections to the servers by using command,

    #netstat -an | grep :80 | sort
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  6. #6
    Join Date
    Dec 2006
    Posts
    477
    Mysql has allocated 784mb but only has 47mb currently paged in to memory. Unlike many other applications a well running mysql tends to keep a large portion of its memory resident, so it is probably causing the high i/o load because it can't get enough ram. However, it may be symptom rather than underlying cause.

    Also, are you on 64-bit OS? Otherwise you may have the 16gb and just can't see it because you are on a 32-bit OS.

  7. #7
    Join Date
    May 2006
    Location
    NJ, USA
    Posts
    6,456
    His box was running 64bit but apache was horribly misconfigured, which was resolved.
    simplywww: directadmin and cpanel hosting that will rock your socks
    Need some work done in a datacenter in the NYC area? NYC Remote Hands can do it.

    Follow my "deals" Twitter for hardware specials.. @dougysdeals

  8. #8
    Join Date
    Mar 2009
    Posts
    245
    Quote Originally Posted by inspiron View Post
    Check the active Internet connections to the servers by using command,

    #netstat -an | grep :80 | sort
    Btw is it possible to reduce view of ip's,for example to show not same ip billion times,instead that something like ip have 240 connections.

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