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Re: [vox-tech] Totally inappropriate question (about HP)
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Re: [vox-tech] Totally inappropriate question (about HP)

Firstly the application is Oracle.  There is a new(ish) paper out about
configuring drives called "Optimal Storage Configuration Made Easy"

Machine: K220 2way
scsi interface: I don't know what that means, It has 2 scsi adaptors which
connect to the raid cabinet.

I (the paper suggests) am minimizing head travel.


----- Original Message -----
From: "Bill Broadley" <bill@math.ucdavis.edu>
To: <vox-tech@franz.mother.com>
Sent: Tuesday, April 17, 2001 5:58 PM
Subject: Re: [vox-tech] Totally inappropriate question (about HP)

> On Tue, Apr 17, 2001 at 05:29:45PM -0500, Jay Strauss wrote:
> > Hoping that some HP sys admins may be part of this list.
> Heh, a few, I just got hpux 11.11 today.
> > I'm running HP UX v11.0.0, using a HP Model 20 disk array.
> What kind of machine?  What kind of scsi interface?
> > Question: How do I build my volume groups out of only the outer
cylinders of
> > the disks?  And, do I do it when I'm creating my physical volumes,
> > volume groups, or my logical volumes?
> Why?  Bandwidth for arrays is usually limited by the I/O bus or the
> SCSI bus.  SCSI disks can arbitrary remap sectors for numerous reasons
> (hard errors, soft errors, ECC coverage).  Each new disk these days is
> good for 30 MB/sec or so.  Get 8 going and your quickly exhausting the
> PCI bus, an Ultra 160 Channel, or even main memory bandwidth.
> I'd just make a volume of the first 1/4th of the block, the 2nd 1/4th, 3rd
> and 4th.  Do some bandwidth tests, if theres a difference then the lower
> perf ones are the inside tracks, and the higher perf are the outside.
> As long as the array is configured for parallel use of the raid and
> not sequential (wierd) it should strip the blocks, the stripsize
> is an option during volume creation I believe.
> If there is no difference in bandwidth do you care?  I guess you
> could be doing some wierd minimizing of head travel for slightly
> lower seek times.  Of course the usual method is to add more heads...
> --
> Bill

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