Date: Thu, 12 Jan 2006 09:56:13 -0800 From: Bakul Shah <bakul@BitBlocks.com> To: Ivan Voras <ivoras@fer.hr> Cc: freebsd-hackers@freebsd.org Subject: Re: increasing dd disk to disk transfer rate Message-ID: <200601121756.k0CHuDiv063356@gate.bitblocks.com> In-Reply-To: Your message of "Thu, 12 Jan 2006 18:48:20 %2B0100." <43C69664.2070505@fer.hr>
next in thread | previous in thread | raw e-mail | index | archive | help
> 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... Good point. Would fsdb help? If not someone ought to extend it.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200601121756.k0CHuDiv063356>