[CentOS] Re: raid1 disk format?

Scott Silva ssilva at sgvwater.com
Tue Jun 10 17:33:05 UTC 2008


on 6-10-2008 9:59 AM Ross S. W. Walker spake the following:
> Les Mikesell wrote:
> 
>> If you have a disk with several partitions set up as members of a raid1 
>> md devices, can you make a dd image of that disk to replace its matching 
>> drive with identical partitions or are there differences between the 
>> mirrored partitions?
> 
> you can 'dd' the MBR and then re-add the partitions to the raid for
> resyncing with 'mdadm'.
> 
> # dd if=/dev/sda of=/dev/sdb bs=512 count=1
> # mdadm /dev/md0 --add /dev/sdb1
> # mdadm /dev/md1 --add /dev/sdb2
> 
> If you want to really make sure you got everything you could dd the
> whole first track with:
> 
> # dd if=/dev/sda of=/dev/sdb bs=512 count=63
> 
> -Ross
> 
Or sfdisk -d /dev/sdX | sfdisk /dev/sdY
where x is source and y is the target.
This will work across drives that have slight geometry differences.

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