dd backup unbelievably slow on SATA laptop
Kevin Kempter
kevin at kevinkempterllc.com
Thu Jan 4 16:14:38 UTC 2007
Hi List;
I have FC5 on an IBM Thinkpad Z60m with 2G of RAM and a 100G SATA HD. I also
have a removeable CD/DVD drive and I can insert a HD adapter into
the "ultrabay" which adds a second HD attached to the main bus (as the CD/DVD
would be).
I inserted the second 100G ATA HD into the ultrabay and booted into single
user mode. The second HD shows up as /dev/hdc my main HD shows up
as /dev/sda. (Note if I boot with hdc=noprobe into single user mode then the
system is not aware of the root user)
I run this:
dd if=/dev/sda of=/dev/hdc bs=64K &
pid=$!
Note: I've tried the same with bs=128K, bs=1M, bs=256K and with no bs tag at
all with the same results
Then I check the progress from time to time with this:
kill -USR1 $pid
I find that my avg speed in 1.7m/sec which leads to a full backup time of
around 16-17 hours.
Before the deal with M$ I used to run SuSE 10 and was able to do a dd on the
same laptop inside of 4 hours.
Any help would be much appreciated....
Thanks in advance
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