raid-one

[Karl Larsen]

Les Mikesell wrote:
> Karl Larsen wrote:
>
>>> It can be harder than this, though. Consider what happens after you 
>>> have been doing this for a while and are re-using disks that already 
>>> have auto-detect md devices on them and/or filesystem labels that 
>>> may conflict with ones you are using.  Some of the quirkier disk 
>>> controllers can also map a volume into the position where it was 
>>> configured, even if you move it or move to a different machine.  You 
>>> might pull a disk from the 2nd position on one machine, move it to 
>>> the first position on a different machine and add an unconfigured 
>>> disk in the 2nd position and have the 2nd drive come up as /dev/sda.
>>>
>>> But, as long as your new drive hasn't been used, an 'fdisk -l' will 
>>> show you which does not have partitions.
>> Les you must have had a real hard time with something. I have not 
>> moved a hard drive in 4 years. I don't need to do that here at home. 
>> When I was working years ago I hired a expert to do all those things. 
>> I could still hire an expert but have more fun learning to be one.
>
> I'm supposed to be the expert...  Things are a little different when 
> you  need to keep hundreds of old machines running all the time plus 
> keeping up with all the new stuff.  I swap disks around all the time 
> and a lot of them had linux raid and labeled filesystems in their 
> previous use too.  For a long time, fedora would refuse to boot if 
> grub.conf or fstab mentioned a label that was duplicated - and 
> installs used the same label names every time so duplication was 
> almost certain.  Something just smells wrong about that - or any form 
> of second-guessing which disk is which.
>
    Yes well  mdadm --detail /dev/md5 tells me that this hard drive 
which does have labels needs to get the labels removed and then get the 
partition changed to fd. I think then I will not be able to boot the god 
dam thing! So before the change you do something with mkinitrd and that 
sure is not something to look for :-(

    Getting just a simple raid-1 running and doing so right is a pain.



-- 

	Karl F. Larsen, AKA K5DI
	Linux User
	#450462   http://counter.li.org.