> Date: Wed, 17 Nov 1999 07:45:32 -0500
> From: TenThumbs <tenthumbs@cybernex.net>
>
> > 8 meg block groups imply you're using 1k blocks. 32 meg block groups
> > imply you're using 4k blocks. E2fsprogs 1.18 automatically creates
> > filesystems with 4k blocks when making large filesystems, but most folks
> > have filesystems created with earlier versions of e2fsprogs which used
> > 1k blocks by default, and so there are many filesystems using 1k block
> > sizes out there. That's why I said 8 megs or 32 megs.....
> >
>
> Doesn't this change in e2fsprogs make it harder to recover data from
> a corrupt fs since there's no obvious way to know where to look for
> backup superblocks.
>
> Yes, there is that downside. We should have put at least one set of
> backup superblocks at a fixed location, but that's one of the things we
> didn't do when we were originally designing ext2. Hmmm... it may be
> possible to put a fixed superblock on larger-sized filesystems by having
> mke2fs create a .backup_superblock file, which make life easier for some
> folks. (Folks who decide they desparately need the extra space back can
> just delete the file.)
Assuming your superblock got trashed, would it be possible to get at the backup
if it were a file in the filesystem?
D
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