|E4DEFRAG(8)||System Manager's Manual||E4DEFRAG(8)|
target is a regular file, a directory, or a device that is mounted as ext4 filesystem. If target is a directory, e4defrag reduces fragmentation of all files in it. If target is a device, e4defrag gets the mount point of it and reduces fragmentation of all files in this mount point.
- Get a current fragmentation count and an ideal fragmentation count, and calculate fragmentation score based on them. By seeing this score, we can determine whether we should execute e4defrag to target. When used with -v option, the current fragmentation count and the ideal fragmentation count are printed for each file.
- Also this option outputs the average data size in one extent. If you see it, you'll find the file has ideal extents or not. Note that the maximum extent size is 131072KB in ext4 filesystem (if block size is 4KB).
- If this option is specified, target is never defragmented.
- Print error messages and the fragmentation count before and after defrag for each file.
It is safe to run e4defrag on a file while it is actively in use by another application. Since the contents of file blocks are copied using the page cache, this can result in a performance slowdown to both e4defrag and the application due to contention over the system's memory and disk bandwidth.
If the file system's free space is fragmented, or if there is insufficient free space available, e4defrag may not be able to improve the file's fragmentation.
Non-privileged users can execute e4defrag to their own file, but the score is not printed if -c option is specified. Therefore, it is desirable to be executed by root user.
|May 2009||e4defrag version 2.0|