Re: Disk requirement (performance-wise) on a Power 7 replacing a System i 520

[Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx>]

Our current 520 has only 2gb memory.  Think that's why i Navigator is slow?
 :)



On Tue, Oct 22, 2013 at 2:49 PM, <rob@xxxxxxxxx> wrote:

> V5R2 will support a minimum of 70GB as a load source.  Since you hold on
> to your systems for quite some time I think I would go for something even
> bigger.  Probably the 280s.  Maybe the 140's.  Since you are raiding you
> are going to want them all the same size.  It's cheaper to add more 280's
> than it is to add another 5887, or to rip out smaller drives and replace
> with larger drives when you hit a capacity boundary.
> With your low disk performance requirements you just may get by with 5
> drives (with the 5th one for hot spare).  Remember one drive is lost to
> raid striping.  Four 280's will look like four 210's after the raid
> striping.
> If you have plenty of slots available it's always easier to expense more
> disk in if it turns out you have a disk performance issue.
> I also agree that spending money on the memory is a good idea.  We have
> one machine where we can't physically add more memory and we're chasing
> quotes on an upgrade.  If there's even a remote possibility that WAS
> and/or Domino may be on your horizon get memory.  Had a consultant today
> who couldn't get a WAS installation to even work since it didn't have
> enough memory and I had to dlpar more memory out of a different lpar.
> Wouldn't be the first consultant I've had to do this with for a WAS
> installation.  The other one had us.ibm.com in his email address.
>
>
> Rob Berendt
> --
> IBM Certified System Administrator - IBM i 6.1
> Group Dekko
> Dept 1600
> Mail to:  2505 Dekko Drive
>           Garrett, IN 46738
> Ship to:  Dock 108
>           6928N 400E
>           Kendallville, IN 46755
> http://www.dekko.com
>
>
>
>
>
> From:   Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx>
> To:     Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
> Date:   10/22/2013 01:00 PM
> Subject:        Disk requirement (performance-wise) on a Power 7 replacing
> a System i      520
> Sent by:        midrange-l-bounces@xxxxxxxxxxxx
>
>
>
> All,
>
> I've asked a BP for a quote on a Power 7 to replace our System i 520,
> thinking that maybe the 3 year cost wouldn't be much more than the
> maintenance alone on the System i.  Haven't received the quote yet, so I
> don't know if I'm delusional or not.
>
> Anyway, the System i has 16 ~36gb drives at only 20% capacity.  IOW we
> only
> have 98gb data on the System i.  Isn't the smallest drive available on the
> Power 7 larger than that?  At a minimum I would want 4 drives, raided,
> with
> a 5th as a hot spare.  Any way to tell the performance, disk-wise, of that
> system as compared to our current system?
>
> Thanks.
>
> --
> Jeff Crosby
> VP Information Systems
> UniPro FoodService/Dilgard
> P.O. Box 13369
> Ft. Wayne, IN 46868-3369
> 260-422-7531
> www.dilgardfoods.com
>
> The opinions expressed are my own and not necessarily the opinion of my
> company.  Unless I say so.
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