Date: Thu, 12 Jan 2006 18:48:20 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-hackers@freebsd.org Subject: Re: increasing dd disk to disk transfer rate Message-ID: <43C69664.2070505@fer.hr> In-Reply-To: <200601121738.k0CHcbQh063237@gate.bitblocks.com> References: <20060112153919.GA21009@dan.emsphone.com> <200601121738.k0CHcbQh063237@gate.bitblocks.com>
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Bakul Shah wrote: >>In the last episode (Jan 12), Christoph Kukulies said: >>dd if=/dev/ad2 conv=noerror,sync bs=64k | dd of=/dev/ad3 bs=64k > > > So now on the new disk he has files with random blocks of > zeroes and *no* error indication of which files are so > trashed. This is asking for trouble. Silent erros are > worse. > > He ought to do a file level copy, not disk level copy on > unix. That way he knows *which* files are trashed and can do The problem is, FreeBSD panics when it encounters bad sectors in filesystem metadata. I had the same situation ~a month ago and gave up, restoring from old backups. It will also probably panic on corrupted or zeroed metadata, but at least it's on a readable disk...
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