[Evms-devel] Clustering/Private containers with RAID

[<rsc...@ed...>]

Greetings All:
   A quick question about clustering with EVMS. I recently had to switch
and not use my PERC 3 /DC card (LSI Elite 1600) which supports
clustering RAID (in hardware) because of HORRIBLE performance. With no
idea when they are going to fix the drivers/Bios/Gremlins and
clustering support I have fallen back to a a couple of Adaptec 39160's.
So far in non-clustering software raid I have been very happy about
performance, 2-3 times faster than the PERC 3's. This brings me to my
concern:

Section 15.1 of the users guide states

Do not assign RAID, snapshot, and BBR features to storage objects on a
cluster container.

I guess I am a little confused by this, while I certainly understand where
software raid could be a problem for shared containers, why couldn't I use
it in a private container? I mean people did this before there was a
"cluster" version of EVMS right? They just manually kept the two servers
from accessing the same container at the same time. Is there something in
using software raid that I am missing?


--Randy Schapel