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Date:      Sun, 19 Jul 1998 21:24:02 +0000 (GMT)
From:      Terry Lambert <tlambert@primenet.com>
To:        grog@lemis.com (Greg Lehey)
Cc:        tlambert@primenet.com, wilko@yedi.iaf.nl, gibbs@plutotech.com, andre@pipeline.ch, Matthew.Alton@anheuser-busch.com, Hackers@FreeBSD.ORG
Subject:   Re: Software RAID-5 performance
Message-ID:  <199807192124.OAA00240@usr06.primenet.com>
In-Reply-To: <19980719163703.G435@freebie.lemis.com> from "Greg Lehey" at Jul 19, 98 04:37:03 pm

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> So *that*'s what happened.  I gave up VxFS for a long time as a result
> of that particular bug.
> 
> > Unfortunately, you could undo this without a low level format.
> 
> Could or couldn't?  I undid it by moving to ufs :-)

Couldn't.  It would mark the range bad in such a way that you
couldn't mark it good.  It did this using sector replacement
off the VTOC.  This means that if you put a UFS on it without
redoing the install, you would end up with the sectors remaining
marked "bad".

The low level format wasn't technically required, but if you did
not szero the spare area and the VTOC, it would recognize this on
a simple reinstall, and the sectors would remain "bad".


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.

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