Date: Wed, 02 May 2007 12:59:00 -0500 From: Eric Anderson <anderson@freebsd.org> To: John Clark <jclark@metricsystems.com> Cc: freebsd-current@freebsd.org Subject: Re: NFS problem Message-ID: <4638D164.7020304@freebsd.org> In-Reply-To: <4638CE63.50209@metricsystems.com> References: <4638C84E.2000704@metricsystems.com> <4638C98F.3070607@mac.com> <4638CE63.50209@metricsystems.com>
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On 05/02/07 12:46, John Clark wrote: > Chuck Swiger schrieb: >> John Clark wrote: >>> I am copying a 'disk image' to an NFS mounted volume. >>> >>> I'm using: >>> >>> dd if=/dev/ad0 of=Disk.img >>> >>> After dd completes the number of blocks indicated is what the raw >>> disk device should be. However, when I look at the NFS mounted image, >>> the file size is anything but the 80 GB size it should be. >> How big is it? Is the data complete/intact up to the point when it >> stopped? > > What I'm doing is cloning a disk, and making it network accessible. So > it is an 80 GB disk image. > > When I mount the 'results', fsck, does start to pick up problems, and > on one of the partitions, basically resulted > in a slew of corrupted inodes. > > So my suspicion is that there are missing blocks scattered throughout. > > >Can you create enough local space on a second drive (or do this by > individial partitions instead) to create the image locally, and then > copy the file at once via NFS? >It'd be nice to see whether that worked > OK. > > I'll see if I can set this up... but that would only verify that dd > wasn't doing something strange... > > One trick I tried was to use 'tee' to create the NFS image, and then > continue the pipe with a 'cksum': > > dd if=/dev/ad0 | tee Disk.img | cksum > > Tee stopped at some point, probably about 2.5 GB with a 'file too > large'... the CVS sources that I'm using > are pretty recent, as in within the last month... Do something like this instead: dd if=/dev/ad0 count=10 bs=1m| md5 dd if=Disk.img count=10 bs=1m| md5 Then you can do: dd if=/dev/ad0 count=10 bs=1m skip=10 | md5 dd if=Disk.img count=10 bs=1m skip=10 | md5 to move through the file.. What are your NFS client mount options, and what OS is on the server? Eric
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