Date: Sat, 9 Nov 2002 23:18:33 -0500 (EST) From: Chris BeHanna <behanna@zbzoom.net> To: FreeBSD-Stable <stable@freebsd.org> Subject: Re: backups of SUPERBLOCK Message-ID: <20021109231607.W9701-100000@topperwein.pennasoft.com> In-Reply-To: <3DCDD873.F498DFC2@kuzbass.ru>
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On Sun, 10 Nov 2002, Eugene Grosbein wrote:
> Phil Kernick wrote:
> >
> > Eugene Grosbein wrote:
> > >
> > > Is there an official way to get list of superblock backups for existing
> > > filesystem, other than backup/newfs/restore ?
> > >
> >
> > Yes. Use newfs -N which will print out the superblock locations. My
> > experience also tells me to also put exactly the same parameters on the newfs
> > line that you used when you originally created the volume.
> >
> > From the newfs(8) manpage:
> > -N Cause the file system parameters to be printed out without really
> > creating the file system.
>
> Thank you. But how do I known parameters of existing filesystem?
>
> disklabel ad0 shows, in partcular:
>
> [...snip...]
Completely unrelated to newfs parameters.
Phil meant that you should pass the same blocksize, fragsize,
minfree, inode density, etc., to newfs -N that you passed to the
original newfs that created the filesystem.
If you didn't do any custom tuning with newfs, it's likely that
newfs -N -b 8192 -f 1024 # pre 4.6
or
newfs -N -b 16384 -f 2048 # 4.6 and up
will be sufficient.
--
Chris BeHanna http://www.pennasoft.com
Principal Consultant
PennaSoft Corporation
chris@pennasoft.com
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