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Re: Moving from RAID 0 to LVM RAID?

 On Thu, 2008-03-06 at 20:09 -0500, Ben Holland wrote: 
> From what I understand about LVM's it doesn't buy you anything and will make 
> your headache only so much worse. 


> If you have a computer that allows 3 
> drives in it, chances are very high that it will have a raid 5 controller 
> built in 

I'd wager more like 50-50. I've seen plenty of 2U boxes that have 4 to 6 
drive bays and don't come with any RAID controller at all, let alone one 
capable of RAID 5. 

> if it doesn't you have several options. RAID 1 2 drives using 2 
> other drives as backup, Software raid 5 3 drives using one as a hotspare, 
> software raid 4 drives (this benefit is that you don't loose AS much disk 
> space as the other 2). LVM doesn't buy you anything, sure you can group 
> together volumes but if a drive dies, then you loose all the LVM's 
> associated with it 

Not quite. You can actually do a vgremove of the dead drive, and 
typically recover any files that were completely confined to the 
remaining disks/volume groups. 

> this is bad and in fact your LVM controller may really 
> hate you 

Um... There is no such thing as an LVM controller. Its all done in 
software by the kernel. 

Jarod Wilson 
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