Bakul Shah wrote:
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.
I think after the dd is done, fsck should be run against the affected
filesystems, which should take care of most of the issues.
The OP's question was how to make dd faster, not really how to get the
data across safely. :)
Eric
--
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Eric Anderson Sr. Systems Administrator Centaur Technology
Anything that works is better than anything that doesn't.
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