1, File Layout and File System Performance
2, File system aging¡ªincreasing the relevance of file system benchmarks
3, Workload-Specific File System Benchmarks
Defragmentation: The best way for defragmentation is always dump-and-restore, so this is why the best defragmentation tool in windows is *Norton GHOST*. However this makes your system a stop time. So, the central concept "defragfs" is: analysis file-system fragmentation on-line and report, let yourself decide how much files you need a dump-and-restore on-line. Simple it is, effective it is.
1, The file 1.avi(~700MB) is downloaded by aMule, the file-system is Reiser3(usage 70%)
#hdparm -t /dev/hda
Timing buffered disk reads: 90 MB in 3.05 seconds = 29.48 MB/sec
1.avi: 48044 extents found
#time cat 1.avi>/dev/null
#cp 1.avi 2.avi
2.avi: 128 extents found
#time cat 2.avi>/dev/null
After re-allocation by the file-system itself, file fragments decreased to 1/375, file read performance improved 7 times, which means much less disk-seek during movie playing.
512MB(90% full) | 768MB(60% full) | 1024MB(40% full) | Defragmentation
Results after defragmentation coming soon...