On Sat, 9 Jul 2005, evilninja wrote:
Damian Menscher schrieb:
That said, is there a way to check the overall level of fragmentation of
a live ext3 filesystem? I know about filefrag, but that's for specific
files. And I think e2fsck tells you, but only if you take the
filesystem offline for the scan.
"tune2fs -l" tells you about "Fragments per group", and "fsck.ext2 -nv"
opens the fs read-only and print some nice stats after that.
I noticed the "Fragments per group", but haven't been able to find
anything that documents what it means. Could someone here comment?
Running e2fsck -nvf gave the info I was looking for:
On my mail partition:
93 inodes used (0%)
30 non-contiguous inodes (32.3%)
# of inodes with ind/dind/tind blocks: 44/17/0
60540 blocks used (45%)
0 bad blocks
0 large files
80 regular files
4 directories
--------
84 files
On my home partition:
191326 inodes used (7%)
11084 non-contiguous inodes (5.8%)
# of inodes with ind/dind/tind blocks: 21649/707/0
4581594 blocks used (86%)
0 bad blocks
0 large files
174096 regular files
15787 directories
5 fifos
274 links
1421 symbolic links (1356 fast symbolic links)
8 sockets
--------
191591 files
So, interestingly, the home directories haven't gotten too fragmented
despite being at >90% usage for several months (much of that time at
95%). Apparently the 5% reserved for the system factors in here.
That's certainly a relief!
On the other hand, the mail spools are getting horribly fragmented
(>30%), probably because mail programs are deleting messages out of the
middle of the spools? It's hard to imagine any other reason for 30%
fragmentation on a filesystem that's less than half full. (Another
system I manage also shows high fragmentation for the mail spool, so I
think this must be a generic problem.)
Damian Menscher
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