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how to determine where most data are written on hdd, i mean which pathes. Currently im having RedHat CentOS 5.10 64bit and im thinking about SSD + HDD setup of ...
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  1. #1
    Linux User postcd's Avatar
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    How to discover linux pathes where most HDD writing happen?


    how to determine where most data are written on hdd, i mean which pathes.
    Currently im having RedHat CentOS 5.10 64bit and im thinking about SSD + HDD setup of a new server so i want to discover where are data writen on HDD, so i can use classic HDD there and on the rest i will use SSD for best reading performance.
    "Avoid the Gates of Hell. Use Linux affordable VPS."

  2. #2
    Linux Engineer docbop's Avatar
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    You can use your info from iotop combined with lsof to track open files.

    I've built thousands of servers and never had to dig that deep unless there was a specific problem to resolve. In general put the OS on your fast SSD, and data, logs, and anything else you have that is writing to a lot or needs lots of space on your less expensive HDD. So you need to know and understand the applications you using. I would mirror both to have at least a basic safety net.
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  3. #3
    Linux User postcd's Avatar
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    when i do "iotop -a" i see almost exclusivelly io usage in like 15 processes like this:
    mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64~mit=43762 --pid-file=/var/lib/mysql/host.domain.com.pid
    so the path where are files written is /var/ or /usr ?

    When i do "lsof -c mysql" i see there are alot of .MYD and .MYI in /var/lib/mysql/dbnames/
    "Avoid the Gates of Hell. Use Linux affordable VPS."

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