[Gllug] pata software Raid

[Peter Ball]

On 9 Aug 2007 at 16:10, Jason Clifford wrote:

> On Thu, 9 Aug 2007, Peter Ball wrote:
> 
> > I'm putting together a couple of Raid 5 boxes using recycled
> > components using the Root-on- LVM-on-RAID-HOWTO.
> > 
> > The Software-RAID-HOWTO gives very good reasons why not to put 2 ide
> > disks on the same bus.
> > 
> > However is there any reason why you shouldn't put a cd or dvd as a
> > secondary on one of the buses ?
> > 
> > Does it make any difference if you use a (presumably faster) dvd
> > instead of a cd drive ?
> 
> So long as you are not using the device it's safe enough.
> 
> > Does it make any difference if you pull out the cd drive after
> > installing the OS ?
> 
> None at all. Your system should be configured such that removable
> media will not be mounted unless actually there.

I could be (and probably am) wrong but my understanding was that problems could arise at 
the level of the controller chip below the level that the OS can see.  I seem to remember 
that the ide bus is slowed down by the slowest device on it.  What I don't know is whether a 
modern cd say 52x or dvd say 16x will slow down transfer of data to a pata133 hard disk on 
the same cable.

Maybee I should use some tests from the Ultimate Boot cd to do some tests whilst I've got 
the kit in bits on my bench and its easy to try permutations.

-----------------------------------
Peter Ball
Computers For Linguists
peter.ball at marguet-ball.net
Tel:    +44(0)20 7732 1741
Fax:    +44(0)20 7358 9214
Mobile: +44(0)77 1968 2913
45 Endwell Road, London, SE4 2PQ, United Kingdom

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