> [ ... ] Unfortunately, jfs doesn't have a defrag tool.
I'll repeat that this is a fortunate occurrence, because "defrag
tool" above really means "inplace defrag tool" and that is a bad
idea, and a copying defrag tool can be 'tar' or 'rsync', and
copying defrag is a much better idea than inplace defrag.
The argument applies to all file system types, especially for
large and critical filesystems.
>>> On Sun, 23 Mar 2008 15:47:59 -0700 (PDT), Mario Burks
>>> <mburks64@...> said:
mburks64> Can the fragmentation of JFS cause slow downs?
Well, that's absolutely guaranteed, "fragmentation" causes slow
downs in most cases.
All and every filesystem that suffers fragmentation suffers slow
downs -- the difference is how much fragementation is likely to
happen for a given file system design and filesystem allocation
and access pattern history.
Some file systems design are more likely to result in greater
fragmentation than others, and that is what is the really
Once fragmentation has happened, no matter what is the file
system design, access will be slower for most usage patterns.
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