From owner-freebsd-questions  Tue Sep 11 20:30:25 2001
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From: "Stephen Hurd" <deuce@lordlegacy.org>
To: "Michael" <taucht@hotmail.com>, <freebsd-questions@freebsd.org>
Subject: RE: Newfs Super Block Backups??
Date: Tue, 11 Sep 2001 21:39:03 -0600
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> It seems to be doing the job but while doing it, it spits out a huge list of
sectors so that
> the whole thing looks like this:

> #newfs -b 8192 -f 1024 /dev/ar0s1e
> Warning: 2008 sector(s) in last cylinder unallocated.
> /dev/ar0s1e: 240203816 sectors in 58644 cylinders of 1 tracks, 4096 sectors,
117287.0MB in 3666 > cyl groups (16 c/g, 32.00MB/g, 7936 i/g)
> super-block backups (for fsck -b #) at
> 32, 65568, 131104, 196640, 262176, 327712, 393248, 458784, 524320, 589856,
> ....
> [pages more]
> ..., 240189472
>
>
> I can mount the file system and should be happy but my inquisitive mind
would like to know what > all this stuff about the super-block backup means, I
could not find any documentation on it.

Those are your super-block backups... :-)

Basically if your super-block heads south for one reason or another, fsck can
find an "alternative" super-block to use... while you copy everything to a new
HD... :-)


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