[mythtv-users] RAID 5 of different sized disks for mythtv storage?

[Robin Hill]

On Mon Sep 11, 2006 at 04:56:56PM -0400, list at onnow.net wrote:

> Quoting "Paul V. Gratz" <pgratz at gratz1.com>:
> >   Setting aside the issue of each drive needing to be on its own IDE
> > bus (right now they share but I'm planning on picking up a new
> > controller card to get to one drive per bus).
> >
> Why each on its own bus? I am wondering if there is an issue with two  
> on a bus?  I have two IDE ports and master/slave on each one.  It  
> works, but is there something I am missing?
> 
There's a number of potential issues.  Firstly, (I believe) the controller
can only talk to one drive on the bus at a time; secondly, a single
modern drive will use over 50% of the bandwidth of a bus so you lose
some performance by sharing; and thirdly, a failed drive will often take
down the entire bus (especially if it's the master which fails) - though
I think this latter issue is less of a problem with modern chipsets.

Anyway, for optimum performance and reliability, the recommendation is
to keep to one drive per bus.

HTH,
        Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <myth at robinhill.me.uk> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |
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