Holger Parplies wrote:
>
> I believe the original idea is *not* to temporarily cripple your RAID but
> rather to add a third disk (three way mirror). I'm not sure if you can do that
> after initial creation of the array, but the man page suggests it should be
> possible "on kernels which provide necessary support". So you would have
> something like
> 
>     4. Add new HDD to raid:
> 
>       # sudo mdadm --grow --raid-devices=3 /dev/md0

If you are starting from scratch, you can create a raid with 3 devices 
and specify one as "missing".   I haven't tried changing the number 
after creation, but it is supposed to work.

>       # sudo mdadm --add /dev/md0 /dev/sdc1
> 
> and --fail and --remove only /dev/sdc1, *never* /dev/sd[ab]1.

If you want the filesystem to be clean, you should momentarily stop 
backuppc and unmount the array before failing and removing the extra mirror.

> I'm afraid I don't have any spare HDDs around to test this right now ...
> 
>> [...]
>> 3) Will it harm my harddrives if I use hot-swapable harddrive-cases?
> 
> As long as they don't get *too* hot ... why should it? Whether or not
> hot-swapping actually works seems to depend on the driver for the hardware
> controller (at least for SATA).

Yes, some SATA controllers will let the kernel notice the new device and 
some won't.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com


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