[mythtv-users] Does JFS filesystem need defragment?
george_mythusers at mari1938.org
Sat Nov 10 16:51:11 UTC 2007
Ismo Tanskanen wrote:
> I use JFS file system for myth recordings, because it's ability to
> delete files quickly.
> Now I'm wondering, if it needs defragment time to time? Does it? Is
> there any utility to do that?
> Or is there better filesystem for myth recordings?
I use JFS for my recordings as well. I've done some research and was
not able to find any defragging utility that would work with JFS.
I've also not found any evidence that JFS needs to be defragmented.
I run FC6, so I grabbed the e2fsprogs package which includes the
filefrag utility. You can point the filefrag utility at your recordings
directory and it will tell you how many extents (fragments) each file is
stored in. My filesystem is pretty full, so most of my recordings are
fragmented in 2 to 12 fragments. With this level of fragmentation I
don't notice any performance issues.
If you really want to defragment your JFS filesystem, you could move all
your files off the filesystem, delete them from the original location,
and then copy them back.
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