You should see batch run times improve by at least 50%, possibly 75%, simply with the 15k to SSD drive change.
Disk controller cache also a large factor, you have controller options, you didn't mention which controller.
Number of drives - 5 , this is below the minimum recommendations.
More arms are always better.
You didn't mention how much memory you have and what you're going to.
More memory the better, I'd go with at least 256 gb.
How many LPARs?
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of ChadB@xxxxxxxxxxxxxxxxxxxx
Sent: Thursday, August 01, 2019 3:23 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Real world performance impact for SSD opposed to spinning drives
OK... we are in the process of spec'ing out a new box in the near future (via an existing business partner)...
We are currently on a 8286-41a with 6 140g 15k drives...
One of the proposed replacements is a 9009-41A with 5 387GB Enterprise SAS
4k SFF-3 SSD drives...
This machine has a workload of serving a Websphere/HTTP website and a Domino server with around 150 users total...
I am curious if anyone has any comments or hunches on what real world performance enhancement that might be seen down at the user experience level (in general)...
We have only used SSD drives in some laptops/PCs... which is very noticeable at that level, but we aren't sure what to expect on a server accessed thru different machines/browsers/Citrix servers, etc...
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