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On 2/8/06, David Guerizec <david@××××××××.net> wrote: |
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> So the directories sensible to fragmentation are IMHO, /var/tmp |
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> and /usr/portage, and they are the ones to put on different partitions. |
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I tend to agree with you. They should also be no larger than |
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necessary. My current partition setup is: |
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/boot 100M |
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/ 6G |
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/tmp 2G |
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/var 5G |
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/usr/portage 1G |
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/usr/portage/packages 6G (includes distfiles) |
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/usr/src 2G |
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/home 66G (the rest of the disk) |
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My feeling is that if you partition sensibly, you don't need to worry |
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much about fragmentation. |
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> Now, I don't have exact numbers to prove my sayings, but anyone can make the |
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> test themself, if they already have /var/tmp and/or /usr/portage on separate |
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> partitions. |
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_Many_ people have reported speedups from having portage on a small |
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separate volume/partition. |
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> I didn't have time yet to sort out what kind of filesystem is more or less |
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> sensible to fragmentation, but from my experience, ext[23] is not a good |
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> candidate for /var/tmp or /usr/postage. Reiser3 has proven to fragment too, |
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> and one of the last system I installed was formated with XFS, which I will |
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> "defragment" in a few weeks. Hopefully I could then come with numbers. |
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XFS is probably the most resistant to fragmentation due to it's |
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extents based format and delayed allocation feature. But in all of |
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the tests I've done on my system, xfs was slower than ext3 for the |
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tasks I care about (backup and restore performance). But there were |
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some improvements in xfs in 2.6.16 that I have been meaning to try |
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out. |
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There is an excellent paper written by the ext3 authors on what they |
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are working on. It gives a good basis for understanding the tradeoffs |
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between xfs, ext3, and reiserfs and their different features: |
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http://ext2.sourceforge.net/2005-ols/paper-html/index.html |
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|
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-Richard |
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-- |
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