[Gllug] RAID LVM and all that

[Ken Smith]

I working with a system that has a normal ext3 disk containing /boot and 
a three disk LVM set containing a VG with two LV's. The three disks in 
the LVM (500G Western Digital Ones) are about six months old and so far 
two of these disks have died. This is understandably exasperating.

So (besides giving WD disks a wide berth, I had also dropped Seagate 
after some other bad experiences) the plan is to switch this set to RAID 
5 and trade 500G of space for a little more reliability.

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?

Thanks in advance

:-)

Ken


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