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I'm planning to use ext4 for my new arch setup primarily because I dislike slow fscks. I have also heard that under certain situations ext4 is faster than ext2. I'll be trying it out with a couple of partitions and may be expand it to my data partitions later. Anyways, here is my initial planned setup.
/tmp [5 GiB] shared between multiple Linux distros
mkfs.ext4 -O '^has_journal'
mount -o 'noauto_da_alloc, noatime'
focus on speed, I could care less about file integrity between reboots as everything would be deleted anyways
/ [8 GiB] arch root
no special mkfs.ext4 options
mount -o 'nodelalloc, noatime'
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ext3 and ext4 are additions to the original ext2; they are exactly the same, only with more features.
ext2 is the filesystem, with less features. I suppose it's slightly faster, and better for some cases (for example, a /boot partition), but really, it doesn't matter. I would rather sacrifice a small amount of speed for the extra features ext3 and ext4 provide rather than stick with ext2.
ext3 adds a journal to the file system. I'd highly recommend ext3 at least on any OS or file storage partitions.
ext4 adds some more features to ext3, like extents, faster checks, and a few other small things.
Overall, I'd recommend ext4 in almost all cases. However, on something like a /boot partition, I'd recommend ext2, and maybe ext3 for something like a /tmp partition. Either way, you should probably choose ext4 for your install.
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Thanks for the suggestions. My partitions are currently ext3 and at 30+ GiB fsck takes a long time.
I was told that with delayed allocation and caching features, minus the journal, ext4 might be faster than ext2. I might try running some benchmarks myself to see how good it works.
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On my bad old machine, ext4 seems to be *much* faster than ext3. I don't know why - it may be something wrong with my machine - but frankly to me the reason doesn't make much difference. I've never used ext2 for anything other than a /boot partition, so can't comment on it.
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