Re: kickstart using raw disks as raid

[Tracy R Reed <treed ultraviolet org>]

Andre Ruiz wrote:
> As I understand, linux raid tools operate on partitions only, not on
> full disks, as hardware based solutions.

That's what I was afraid of. Thanks for the info. I will have to figure 
out a way to increase the size of the partition in the fly when the time 
comes that we need to do such a thing.

> In your case, it seems the raid logic would be inside virtual
> machines, is this correct? You would have double network traffic. You
> can create one big partition of PV type, and create more small
> partitions of PV type and make them join the VG each time you grow
> your disks. The raid would be on each filesystem of LVM. Still a pain
> in the arse.

Yes, the RAID logic is inside the virtual machines. Double network 
traffic is no problem as I have two gigabit network interfaces which I 
can dedicate to the SAN. Yes, creating partitions and adding them to the 
VG each time is possible but a pain. I'll have to see what else I can 
work out.

> Hard to switch to raid on the AoE server?

I already have RAID5 on the AoE server. But what if the CPU/RAM/mobo on 
the AoE server dies? :) This is why one side of the mirror is on one AoE 
server and the other side of the mirror is on another. If the cpu node 
dies I can restart the domain on another one very quickly. The only 
single point of failure in my cluster is the switch and eventually I 
might even get another one and put half the disk nodes on one and half 
on the other and cross connect the cpu nodes. :)

--
Tracy R Reed                  http://ultraviolet.org
A: Because we read from top to bottom, left to right
Q: Why should I start my reply below the quoted text