How to mirror a harddisk for backup purpose
Kwan Wing Keung
hcxckwk at hkucc.hku.hk
Fri Jun 22 03:29:53 PDT 2001
On Fri, 22 Jun 2001 alvin at Mail.Linux-Consulting.com wrote:
> hi kwan
> i would use tar to copy disks onto antoher disk...
> # copy hda onto hdb...
> dd if=/dev/hda of=/dev/hdb bs=1024
> BUT..BUT...dd is bad ...
> - it copies bad block info fron disk-a onto disk-b
> - it does NOT know that disk-b has bad sectors where it was
> good on disk-a
> - it copies all the empty unused space onto the 2nd disk
> unless you tell it NOT to copy all of the partition
> in which case you are assuming that you know where all
> the bits are for a given file/inode tree
THANKS!!! May I know what is your preferred mirror method?
In my LINUX PC, I already have 2 identical harddisks
C: and D: (in MSDOS terminology).
More information about the Beowulf