Cent OS migration

[Fairlight]

You'll never BELIEVE what Jay Ashworth said here...:
> ----- Original Message -----
> > From: "Boaz Bezborodko" <boaz at mirrotek.com>
> > > 4. What RAID configuration is best for speed and failover, etc? We
> > > are a busy place and can't afford downtime.
> 
> > 4. I don't know which is best, but we set up ours as RAID 0+1 for the
> > combination of speed and reliability. I don't know if the speed of
> > newer hardware means that RAID 5 can now run without the speed penalty
> > it used to have.
> 
> Forgot: *use a real RAID controller*.  PERCraid5, Adaptec 2100S.  If it
> doesn't have its own RAM and a battery module, it's not a real RAID 
> controller.  Don't even bother with motherboard RAID.

He cannot stress that enough.  I had a client that got a server all set up,
and went to use Edge, only to find out that CentOS had automatically
detected software RAID between the two drives present.  It was supposed to
be one visible array, it was configured as such, but it didn't perform as
such.  If you can see both (or more) drives that should be singular RAID
arrays presented as a unified device, your hardware is either incorrectly
configured, or if it's properly configured, it's not properly compatible.

cat /proc/scsi/scsi

...Do that before proceeding.  If it doesn't look right, save yourself the
time and find the problem before proceeding further.

mark->
-- 
Audio panton, cogito singularis.