[dba-Tech] Re: RAID definitions etc

I personally have moved 'Dynamic' disks from one system to another.  No real
problem, and not dependant on Motherboard.

Drew

-----Original Message-----
From: dba-tech-bounces at databaseadvisors.com
[mailto:dba-tech-bounces at databaseadvisors.com]On Behalf Of John W. Colby
Sent: Sunday, May 16, 2004 6:46 PM
To: Discussion of Hardware and Software issues
Subject: RE: [dba-Tech] Re: RAID definitions etc


Drew,

I got the feeling that what the author was saying is that the actual
encoding / striping / pattern written to the disk was not a standard and
every chip set could do whatever they wanted.  Thus the data stream read off
the disk was readable but meaningless as a whole to anything but the chipset
that wrote it.  That really doesn't make sense in a mirror since it is "just
a disk" but in the case of various striping raids then it might.

Again I am totally ignorant about this so I'm not going to argue one way or
the other.

John W. Colby
www.ColbyConsulting.com

-----Original Message-----
From: dba-tech-bounces at databaseadvisors.com
[mailto:dba-tech-bounces at databaseadvisors.com]On Behalf Of Drew Wutka
Sent: Sunday, May 16, 2004 6:32 PM
To: Discussion of Hardware and Software issues
Subject: RE: [dba-Tech] Re: RAID definitions etc


Not really true John. Yes, changing motherboards is going to 'goof' the OS,
but the RAID is done by using Dynamic disks, so you just have to 'import'
the disk with a new motherboard.

However, it's a catch 22.  Yes, the Mirror is recoverable, if you change
motherboards, however, the OS isn't.  So if you have a mirrored data drive,
you're good.  Anything else is going to be worthless by definition.  You are
going to have to install the OS again, with a motherboard change (regardless
if it's a software or hardware raid).  If it's a 'Programs' paritition, the
programs are going to have drivers installed, so they'll be just as
susceptible to a motherboard change as the root drive.

Drew




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