Messages in this thread | | | Date | Wed, 19 Jan 2000 08:49:05 -0500 | Subject | Re: [Patch] Cleanup struct gendisk registration, 2.3.40-pre1 | From | tytso@MIT ... |
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Date: Mon, 17 Jan 2000 21:02:10 +0100 From: Jamie Lokier <lkd@tantalophile.demon.co.uk>
Sparse superblocks can be turn on/off by the current tune2fs. You follow it by a fsck to clean up, then it's done. I was hoping they'd speed up the mount but its still takes an age...
Until I get the patch in, just do "mount -o check=none"; it's what I've been doing forever,
Why does 4k blocksize check faster? (I've never tried it). Does it use fewer superblocks?
The indirect blocks are bigger, so a single indirect block can hold more block numbers; futhermore, each block is bigger, so the number of indirect blocks needed goes down by a factor of 16.
From: Andi Kleen <ak@muc.de> Date: Tue, 18 Jan 2000 08:15:13 +0100
And much more waste. I recently discovered that a ~5GB 4K ext2 source code partition has ~480MB wasted in file tails. The same fileset (about 192k files) would only waste ~108MB with 1K blocks.
It depends on what you're putting in the filesystem. If it's mostly smallish files. such as you might expect on a source partition, then the fragmentation overhead is much more of an issue; a 1k block size is probably more appropriate. But if you have a filesystem with really large files, then a 4k blocksize is really what you want.
- Ted
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