>>
>> So, I face a problem:  How to REBUILD / CLONE sda to sdb with Linux 
>> command mdadm??  :((
>>
>>
>> Timmy
>
> The "simplest" route is to just use dd(1):
>
> dd if=/dev/sda of=/dev/sdb bs=1M conv=notrunc,noerror,sync 2>&1 | tee 
> /tmp/dd-errors.log
>
> This will create an exact, bootable clone, including partition tables 
> and UUID. It may take a long time, and there is no progress indicator 
> with dd, but it works. If there are errors, you can check the file tee 
> writes. See the dd manpage for more details.
>
> Other alternatives include partimage, available here: 
> http://www.partimage.org/Main_Page -- and also, the mdadm command 
> itself -- the short version: set up RAID 1, partitions to Linux raid 
> autodetect, put the first drive (your everyday drive) as the first in 
> the set and the second as the mirror. The md driver should 
> automatically rebuild the mirror for you. Just make sure you partition 
> the disks the same way. There's plenty of information on the web about 
> working with md/mdadm.
>
> -- 
> Samuel Halicke      [log in to unmask]
> FNAL/CD/SF/FEF      FCC/252/U
> (T): 630.840.4308   (P): 630.266.0042

Hi Samuel,
I booted my server with Rescue CD and input your recommended command!!!  
Worked exactly the way as your stated!!!  Fermi Lab Scientist 5 Stars!!!
* * * * *

It took about 45 minutes to copy the whole 160GB harddisk!  Many Thanks!!!


After the computer booted as normal RAID 1 (not degraded mirror), I 
checked the RAID by mdadm command.  It still showed that /dev/md0; 
/dev/md1 as inactive.  Is this normal for software RAID 1??

Timmy