Firstly the application is Oracle. There is a new(ish) paper out about
configuring drives called "Optimal Storage Configuration Made Easy"
(http://technet.oracle.com/deploy/performance)
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.
Jay
----- Original Message -----
From: "Bill Broadley" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
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,
physical
> > 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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