Christoph Kukulies wrote:
Anyway, I decided to buy a second identical hard disk and tried to
block by block copy the old disk to the new one using
dd if=/dev/ad2 of=/dev/ad3 conv=noerror
The process is running now since yesterday evening and it is at 53 MB
at a transfer rate of about 1.1 MB/s.
The default block size for dd is 512 bytes, meaning dd will read 512
bytes from one disk and write them to the other before reading again.
This is SLOW. You need to specify a larger block size to use it
effectively, like adding "bs=1m" argument to dd (which will make it use
1 MB blocks). Also, you should probably add "sync" to your "conv"
argument, see the manual page of dd. I don't know if using "sync" will
produce a full 1 MB of zeros when a bad sector is encountered - I hope
someone else will clarify this :)
Btw. I don't think this is the right group for your question - in the
future use [EMAIL PROTECTED] or [EMAIL PROTECTED]
_______________________________________________
freebsd-hackers@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
