Date   : Fri, 02 Jun 2006 12:37:01 +0100
From   : Phil Blundell <philb@...>
Subject: Re: MDFS Parity Mod

On Fri, 2006-06-02 at 11:40 +0100, Ian Wolstenholme wrote:
> Can anybody remember the "rule" for attaching SCSI drives to
> an MDFS which has had the parity mod carried out?  I thought it
> was that if the Parity mod is present and the SCSI drive has a
> parity link jumper, then parity must be enabled on the drive for it
> to work properly.  However, I have just tried a Seagate drive with
> parity enabled and disabled and there appears to be no difference.

The parity mod is to generate parity out of the MDFS, which allows you
to use SCSI drives that expect to see parity on the bus.  I'm pretty
sure the MDFS itself never checks parity even with the mod.

So, the summary is that without the mod, you must disable parity on your
drives (and are SOL if your drive doesn't have the option to disable
it).  With the mod, you can use drives either with or without parity.

p.