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    SubjectRe: [Patch] Cleanup struct gendisk registration, 2.3.40-pre1
    Date
    [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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