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edcjones
n00b
Joined: 04 Jul 2002
Posts: 60
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 Posted: Wed Dec 04, 2002 3:12 am Post subject: ext2 VS ext3 |
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I am trying to change my ext3 partitions to ext2. According to dumpe2fs, the ext3 partitions have features "dir_index" and "has_journal". The ext2 partitions have neither. "tune2fs -O ^has_journal /dev/hdxx" got rid of the "has_journal". What are the differences between the ext2 and ext3 filesystems? How do I convert _completely_ to ext2? How to get rid of the "dir_index". Do I need to?
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Python, Swig & computer vision |
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gfunkmonk
Tux's lil' helper
Joined: 10 Jul 2002
Posts: 129
Location: Freelandville, IN
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| Posted: Wed Dec 04, 2002 4:31 am Post subject: |
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I think all you have to do is the:
tune2fs -O ^has_journal /dev/hdxx
then change your FSTAB from ext3 to ext2.
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Slackware is Gentoo's bitch. |
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matthead
n00b
Joined: 04 Dec 2002
Posts: 63
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| Posted: Wed Dec 04, 2002 6:25 am Post subject: dir_index feature |
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You get rid of dir_index the same way you removed has_journal:
| Code: | | tune2fs "-O^dir_index" |
You should run e2fsck on the filesystems you change, too.
ext3 is ext2 plus journalling. That's it. The dir_index feature tells the kernel to use htree directories if they are enabled in-kernel. Unless you specifically patched your kernel to include them it won't - the htree support is still too new for anyone to be including it by default. The reason your filesystems have the feature is that a few versions of mke2fs (1.29 is one of them, I think) set the feature by default on new filesystems. If you're not using htree, you should remove the dir_index.
Edit:
Looking at another thread I see that Gentoo's kernel might include buggy htree code. In that case, I'd say you should definitely remove the dir_index feature and run e2fsck -f, unless you want to play with patching your kernel and test the htree code.
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-Matt |
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li1_getoo
l33t
Joined: 20 Oct 2002
Posts: 661
Location: Queens , NY
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| Posted: Wed Dec 04, 2002 6:51 am Post subject: |
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ext3 is a little better ,uses journaling if u use make sure u compile it in ur kernel  |
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