Numbering of md devices

[Michael Hipp]

A. Khattri wrote:
> On Wed, 15 Nov 2006, Michael Hipp wrote:
> 
>> How do I nail down the numbering order of mdx devices?
>>
>> I have this arrangement:
>>
>>    md0  /dev/sda1  /boot
>>    md1  /dev/sda2  /(root)
>>    md2  /dev/sda3  <swap>
>>    md3  /dev/hda5  /home
>>
>> I added another RAID1 device based on /dev/hdc1. It stupidly gives me this
>> arrangement (and, of course, won't boot):
>>
>>    md0  /dev/hdc1
>>    md1  /dev/sda1  /boot
>>    md2  /dev/sda2  /(root)
>>    md3  /dev/sda3  <swap>
>>    md4  /dev/hda5  /home
>>
>> How can I somewhere set in concrete the enumeration/ordering of the md devices?
> 
> How are you building the arrays? mdadm?

Yes. Something along these lines...

   mdadm --create /dev/md4 --level 1 --raid-devices=2 missing /dev/hdc1

Michael