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Today, I checked the running processes on my Ubuntu 12.04 server. There are 9 processes named jfsCommit, jfsSync and jfsIO.

I wanted to ask what they are used for because I never saw them before and if/how I can remove them if needed. Also there are some processes starting with xfs which I never had before.

Thank you!

Output of df -T

Filesystem     Type     1K-blocks    Used Available Use% Mounted on
/dev/sda1      ext4     480719568 2315116 453985228   1% /
udev           devtmpfs   1994316       4   1994312   1% /dev
tmpfs          tmpfs       801252     288    800964   1% /run
none           tmpfs         5120       0      5120   0% /run/lock
none           tmpfs      2003128       0   2003128   0% /run/shm
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Looks like IBM's journaled filesystem. What is your output of df -T? –  konapun Jul 29 '13 at 17:47
    
@konapun added it to first post. –  Mellnik Jul 29 '13 at 18:40

1 Answer 1

up vote 1 down vote accepted

Found the answer here.

Even if you are not using JFS/XFS, these kernel processes exist if the JFS/XFS kernel modules are loaded. Assuming you're using a recent stock kernel, these kernel modules are .ko modules, so to prevent them from loading all you need to do is blacklist jfs and xfs inside /etc/modprobe.d

If you are using a kernel that has these modules built-in, the only way to remove them is at runtime with an rmmod or modprobe -r -- in that case, those would have to go into a startup script.

To find out whether yours are modular or built-in, just do a sudo updatedb and locate jfs.ko, locate xfs.ko. If results in the /lib/modules/ directory are returned, they are modular; otherwise, they're built-in.

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