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It is most likely that you want to compress some file systems like /usr to reduce disk space usage. You can use the cogoioctl program from cogoutils RPM package to compress your files on-the-fly even without unmounting your original file system. In general, the following rules apply:
A. If /usr is on the same partition as /
1. mkdir /cogofs
2. mv /usr /cogofs/_usr
3. mkdir /usr
4. mount -t cogofs -o fs=/cogofs/_usr none /usr
5. in /etc/fstab, add
none /usr cogofs fs=/cogofs/_usr 0 0
B. If /usr is on a separate partition ( eg. /dev/hda5 )
1. mkdir /cogofs/_usr
2. mount /dev/hda5 /cogofs/_usr
or
mount --bind /usr /cogofs/_usr (if /usr is already mounted)
3. mount -t cogofs -o fs=/cogofs/_usr none /usr
4. modify /etc/fstab to change the mount point of /dev/hda5 from /usr
to /cogofs/_usr, for example:
change:
/dev/hda5 /usr ext3 defaults 1 2
to:
/dev/hda5 /cogofs/_usr ext3 defaults 1 2
5. in /etc/fstab, add
none /usr cogofs fs=/cogofs/_usr 0 0
(Note: This must be added after the /usr mount )
If there is any sub-mount under /usr ( or the file system that you are working on ), you should repeat the above procedure for all the sub-mount points.
Now, you can use the cogoioctl utility with -R -c option to compress all files under /usr, ie:
$ cogoioctl -R -c /usr |
As /usr usually contains more than 2G of data the compression may take a very long time to run. On a busy server, you are suggested to do the compression after busy hours. You can use a cron job to automate the task.