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Date:      Thu, 7 Feb 2002 11:54:02 -0600
From:      Dan Nelson <dnelson@allantgroup.com>
To:        Markus Stumpf <maex-freebsd-hackers@Space.Net>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: dump(8) race conditions?
Message-ID:  <20020207175402.GA79258@dan.emsphone.com>
In-Reply-To: <20020207185052.A87994@Space.Net>
References:  <20020207185052.A87994@Space.Net>

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In the last episode (Feb 07), Markus Stumpf said:
> We use amanda and dump for backups. Some hosts have rather busy disks
> even during non prime time hours when backup is run.
> 
> >From time to time amanda reports dump(8) errors like the following:
> 
> ?   DUMP: read error from /dev/rda4s1e: Invalid argument: [block -410921522]: count=3072
> ?   DUMP:   DUMP: read error from /dev/rda4s1e: Invalid argument: [sector -410921522]: count=512
> ?   DUMP: read error from /dev/rda4s1e: Invalid argument: [block -410921532]: count=5120
> ?   DUMP: read error from /dev/rda4s1e: Invalid argument: [block -1001057530]: count=1024
> [ ... ]

Dump should ideally be run on an unmounted filesystem.  The next best
is to create a snapshot ( /usr/src/sys/ufs/ffs/README.snapshot ) and
dump that.

-- 
	Dan Nelson
	dnelson@allantgroup.com

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