Date: Thu, 8 May 2003 12:37:41 +1000 From: "Pietralla, Siegfried P" <siegfried.pietralla@eds.com> To: "'Paul English'" <penglish@hydro.washington.edu>, freebsd-questions@freebsd.org Subject: RE: Back/restore with dd Message-ID: <16649A8D5C73D51183B80008C728EEB7CC0CCC@AUSYM103>
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paul, i've noticed the same thing. i was trying to duplicate my installation from ad0s1 to ad0s2 by copying each partition and had the same problem. i worked around this by using 'of=/dev/ad0' and VERY careful use of the 'seek' parameter ( e.g. " dd if=/dev/ad0 count=10 skip=nnnnn | od -c > /tmp/001 " and match this with " dd if=/dev/ad0s1e count=10 | od -c > /tmp/002 " using " sdiff /tmp/001 /tmp/002 " to validate the value for seek ). is there someone out there who knows how we can do this? fwiw, i think it used to work previously ( v 2.2.8 ? ) but it fails at 4.6 ( ? ) . i'm running 4.8 now so i'll give it another go on the weekend. regards, siegfried. -----Original Message----- From: Paul English [mailto:penglish@hydro.washington.edu] Sent: Wednesday, 7 May 2003 3:30 To: freebsd-questions@freebsd.org Subject: Back/restore with dd So in the process of trying to recover my files, I made a backup copy of a partition using dd. I did: dd if=/dev/ad1s2e of=ad1s2e So I created a file, the size of the partition sitting on another disk area. Now I want to copy that back to another disk partition. I tried just using dd, but that didn't work: dd if=ad1s2e of=/dev/ad1s1e dd if=ad1s2e of=/dev/ad1s1e dd: /dev/ad1s1e: Read-only file system 2+0 records in 1+0 records out 512 bytes transferred in 0.026033 secs (19667 bytes/sec) I have created ad1s1e (which is a different physical disk) as a partition with the same block count as ad1s2e. I used /stand/sysinstall, so it should have had the same defaults for everything, correct? What am I missing? Why would it say read-only file system, and then proceed to transfer only a couple of bytes? Thanks, Paul _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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