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Date:      Tue, 4 Apr 2000 16:26:09 -0400 (EDT)
From:      Mike Wade <mwade@cdc.net>
To:        "Jeffrey S. Sharp" <jss@subatomix.com>
Cc:        freebsd-small <freebsd-small@FreeBSD.ORG>
Subject:   Re: Mounting and Corruption Rehashed 
Message-ID:  <Pine.GSO.4.10.10004041623150.22626-100000@server2>
In-Reply-To: <005a01bf9e74$9d2bc6b0$2aa85c0a@vulcan>

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On Tue, 4 Apr 2000, Jeffrey S. Sharp wrote:

> Good.  I don't need to change stuff much or often in my application,
> either.  However, as soon as I get something booted using flash as root,
> I'll do some testing to see if heavy writes + repeated remounting does
> indeed cause corruption in a DiskOnChip.

I've experienced file system corruption with the DiskOnChip while toggling
back and forth between mount ro -> rw -> ro.  All of my file data was
mysteriously replaced with NULL's.  Please let me know your findings
though. =)

> > The superblock gets updated from time to time.
> 
> Aye, there's the rub!
> 
> > Also, when things are mounted r/o you can power off at any
> > time and know that the filesystem will be stable when you
> > come back.
> 
> Aye, there's the other rub!

From my understanding a journaling filesystem would help out but does not
exist yet on FreeBSD.  Would the soft updates feature help any with
preventing corruption due to reboots?

---
Mike Wade (mwade@cdc.net)
Director of Systems Administration
CDC Internet, Inc.



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