RE: New SSD options for IBM Power Systems provide enhanced performance at a lower cost -- MIDRANGE-L

If you recall several of the spats on the list about the minimum number of
drives for a partition that was really all about I/O channels, and giving
IBM i enough to be reasonably efficient. It does not matter if the DASD
unit is virtual or physical it still counts. Because you always use
internal storage and are a sufficiently large environment that limit has
never affected you, but it's there nonetheless.

As to I/O capacity the cards/cables/expansion chassis/busses all have a
limit of how much data they can move. So as you get to larger faster
devices some though has to go into the other I/O bottlenecks that could be
created.

I'm not suggesting that the current hardware is constrained, but it is a
design factor for those of us that design and install systems.

--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steinmetz, Paul
Sent: Tuesday, April 19, 2016 3:01 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: New SSD options for IBM Power Systems provide enhanced
performance at a lower cost

Jim,

< but I/O capacity still does.

What do you mean by capacity still does.

< First IBM i sets up I/O channels based on how many I/O devices it has

I've never heard of this?
Could this apply only for VIOS or external drives.

I'm 100% internal drives.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim
Oberholtzer
Sent: Tuesday, April 19, 2016 3:48 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: New SSD options for IBM Power Systems provide enhanced
performance at a lower cost

Arms maybe not but I/O capacity still does.

Remember two things. First IBM i sets up I/O channels based on how many I/O
devices it has, that's one of the reasons we all get so cranky about having
at least six DASD units (real or virtual) per partition. Secondly we drive
a bunch of I/O today, by orders of magnitude larger than when the B models
came out, so much so that you can over run an I/O channel now. So you need
to design in sufficient I/O regardless of the type of device.

--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steinmetz, Paul
Sent: Tuesday, April 19, 2016 2:23 PM
To: 'Midrange Systems Technical Discussion'
Subject: New SSD options for IBM Power Systems provide enhanced performance
at a lower cost

Do number of arms still matter?

http://www-01.ibm.com/common/ssi/cgi-bin/ssialias?infotype=an&subtype=ca&app
name=gpateam&supplier=897&letternum=ENUS116-036

http://www-01.ibm.com/common/ssi/rep_ca/6/897/ENUS116-036/ENUS-116-036-LIST_
PRICES_2016_04_12.PDF

Thank You
_____
Paul Steinmetz
IBM i Systems Administrator

Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071

610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home

psteinmetz@xxxxxxxxxx<mailto:psteinmetz@xxxxxxxxxx>
http://www.pencor.com/

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