[Gllug] RAID LVM and all that

[Christian Smith]

Ken Smith uttered:

> Now my question is this. I know there is a little bit of magic in the
> NASH script that the boot loader runs where (I think this is right) just
> at the end of the kernel initialisation LVM is switched on and the
> system starts to mount the filesystems in the right places. In this
> system the majority of the system is in VolGroup01/LogVol00. So if I
> move that LV onto a raid set will the whole thing fall in a heap not
> being able to find its filesystems? Or does MD get turned on before LVM
> so that it will all hang together just fine?


Your distro should be clever enough to turn on MD before LVM as required.
You'll want a RAID-1 /boot partition, so your machine can boot with any 
one of the disks missing (test this!) and the rest of each disk can be 
RAID-5 on top of which LVM is used.

You should be able to build the RAID set(s) then migrate you existing LVs 
to the new RAID set using a combination of vgextend/pvmove/vgreduce.


>
> Thanks in advance
>
> :-)
>
> Ken
>
>
>

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