*BSD News Article 93551


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From: Casper.Dik@Holland.Sun.COM (Casper H.S. Dik - Network Security Engineer)
Newsgroups: comp.unix.bsd.misc
Subject: Re: Is there a BSD for me?
Supersedes: <cancel.casper.861032768@uk-usenet.uk.sun.com>
Date: 14 Apr 1997 15:42:58 GMT
Organization: Sun Microsystems, Netherlands
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References: <334499cf.10431258@agate} <33450A8A.167EB0E7@freebsd.org> <5ite39$icq@innocence.interface-business.de>
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j@ida.interface-business.de (J Wunsch) writes:

}After i had to give training courses for the Logical Volume Manager of
}AIX (good piece of work) and DEC Unix (not quite as good), i'm now
}half-seriously thinking about an LVM management layer for FreeBSD.
}Given that there's already ccd, this shouldn't be too hard to add.
}Still, the point remains that the classic UFS ain't expandable, but i
}think expansion in slices of the already existing cylinder groups
}should not be too difficult either, and would be a starting point.
}For FreeBSD, a cylinder group should usually translate to 4096 sectors
}times 16 cylinders, i.e. 32 MB, so you could extend an existing UFS in
}units of 32 MB.


You can expand UFS filesystems in smaller bits; the last cylinder group
doesn't need to be complete; when you grow an fs you first complete the
last incomplete cylinder group and then add new ones till you
run out.

This is what Solaris 2.x "growfs" does.

(But you'd probably be better of with a different filesystem than UFS)

Casper

--
Expressed in this posting are my opinions.  They are in no way related
to opinions held by my employer, Sun Microsystems.
Statements on Sun products included here are not gospel and may
be fiction rather than truth.