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There is another thing that might or might not play into that. You have a
lot of LPARs. If those LPARs live in the same SAN AND the storage modeler
says it's OK? you can enable deduplication and compression. And oh boy, do
IBM i workloads dedupe and compress.

On Fri, 13 May 2022 at 11:39, Rob Berendt <rob@xxxxxxxxx> wrote:

Our BP is starting to break through to the boss that SAN's aren't the cost
hog they used to be.
We're looking at a small Power system to replace the P8-41A. Boss is
still looking at internal for that. I did bring up the fact that it would
be in the same rack as our largest system and a SAN would be nice when we
replace that.
It's kind of a chicken and egg thing. (which I used literally when
talking to him). If we were looking at the largest system now SAN might
have a better chance and then the small system would use the same SAN. But
since we're looking at the smaller system first we're going to probably go
internal.

Oh, and our network equipment is approaching EOL and this would be a good
time to upgrade that to support faster FC speeds.

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 7310 Innovation Blvd, Suite 104
Ft. Wayne, IN 46818
Ship to: 7310 Innovation Blvd, Dock 9C
Ft. Wayne, IN 46818
http://www.dekko.com

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Steve Pavlichek
Sent: Friday, May 13, 2022 9:30 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: VIOS disk evolution

CAUTION: This email originated from outside of the organization. Do not
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A couple additional points.
For LPAR'd systems I have not see a configuration that external storage
was not less expensive.
For system with one or two LPARs, you can use external storage without
Fibre switches which helps reduce cost. This also works on the 4-core
systems which do not allow expansion drawers.
For customers stuck on v7r1, IBM will continue to provide HW/SW support on
S922 with special feature code for v7r1 support. VIOS and external storage
is required for this support.

I am in the process of migrating a new customer from I hosting I with
internal storage to external storage. They were seeing disk response times
of over 50ms at times. Now this peaks at less than 5ms and normally runs
less than 1ms.



From: Larry "DrFranken" Bolhuis<mailto:midrange@xxxxxxxxxxxx>
Sent: Friday, May 13, 2022 8:46 AM
To: Midrange Systems Technical Discussion<mailto:
midrange-l@xxxxxxxxxxxxxxxxxx>; Rob Berendt<mailto:rob@xxxxxxxxx>
Subject: Re: VIOS disk evolution

There is a line on cost relating to total disk needed. Below x amount of
disk, internal is cheaper. Then they approach parity and above y amount
of disk external is cheaper.

Also consider that your IBM i host partition is consuming IBM i Licensed
CPU and significant memory. Compare to VIOS which runs in other cores
and uses less memory. And with POWERVM now 'no additional charge' there
is actually a cost savings with VIOS over IBM i as a host.

Then you add in the flexibility that SAN provides and rapidly it becomes
the goto choice.

As I said, once you got SAN you simply don't go back.

- L

On 5/13/2022 7:10 AM, Rob Berendt wrote:
We looked at SAN a few years ago. We deemed it prohibitively
expensive. As of now the only SANs we have support our vmware
environment. So there is some familiarity with flash copy, etc.

Rob Berendt

--
IBM Champion for Power Systems

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