Hello
We normally use dd on Compaq Tru64 unix to make
copies of disks including partition information and data
from all partitions. It even works for the system disk.
We have tried to do the same thing in RedHat Linux 7.2 but with
problems. 1) It takes relatively long time, ca 15 h for 18 GB.
2) The operation ends with an error message ( No such device
or address). 3) If we try to copy the system disk in this way it will
not be a working bootable system disk.
Is this due to the fact that we are optimistically
trying to copy a mounted 'living' (system)disk or is this some kind
of problem with 'dd' ?
Sincerely Ib Koersner
The Svedberg Laboratory
Uppsala
Sweden
Copying whole disks using dd with raw devices:
First connect raw devices to block devices:
raw /dev/raw/raw1 /dev/sda
raw /dev/raw/raw2 /dev/sdb
Then copy:
[1]- Running time dd if=/dev/raw/raw1 of=/dev/raw/raw2 bs=2048 &
[root@lora root]# dd: reading `/dev/raw/raw1': No such device or address
8891619+1 records in
8891619+1 records out
real 891m9.305s
user 0m8.470s
sys 4m8.530s
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