Messages in this thread | | | From | Andreas Dilger <> | Subject | Re: [Patch] Cleanup struct gendisk registration, 2.3.40-pre1 | Date | Mon, 17 Jan 2000 21:47:02 -0700 (MST) |
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[note email sent to linux-fsdevel, as it is OT for l-k] Jamie Lokier writes: > Alan Cox wrote: > > Its caught errors before that probably avoided people losing data. Its a > > good sanity check. The "stupid" defaults are two other things > > > > o Using 1K blocks on large disks (4K is way faster) and > > 4K checks way faster too > > > > o Not using the "sparse superblock" option on large disks > > when creating them. > > > > Unfortunately I dont think there are any "in place" fixers for those > > creation time choices. > > 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... > > Why does 4k blocksize check faster? (I've never tried it). Does it use > fewer superblocks?
Not only are there 1/4 fewer (superblocks, group descriptors, inode/block bitmaps) with 4k ext2 filesystems, but also files have fewer blocks, including single-, double-, and triple-indirect blocks, so much less checking for a given amount of data.
Cheers, Andreas -- Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, \ would they cancel out, leaving him still hungry?" http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
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