Re[2]: How to calculate "daily change rate"?

Having read this a little more carefully, a question: are you after the number of I/O done so the vendor can choose which type of storage to put on the SAN, or are you after the change rate for replication purposes? In either case partners have tooling they can use to determine that number, even when converting from internal to external storage.

My other thought is "why do I care"? The SAN is going to out perform the I/O on the internal storage (assuming the Fibre network is adequate) so, as long as you have sufficient space for the actual storage, growth, and flashcopies for backup and testing I'm at a loss to really understand why the problem.


--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


------ Original Message ------

From "Patrik Schindler" <poc@xxxxxxxxxx>

To "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxxxxxxxx>
Date 11/10/2022 10:27:43 AM
Subject Re: How to calculate "daily change rate"?

Hello Rob,

Am 10.11.2022 um 12:54 schrieb Rob Berendt <rob@xxxxxxxxx>:

I've been asked to calculate the daily change rate. Something to do with the SAN we're looking at.

One idea was to see how much is saved on a daily basis. "IF" we are doing incremental backups. We aren't.

Wouldn't help, because one block can be changed multiple times. See my other message.

Probably you can get some estimates about I/O statistics of the performance tuning collector? Probably even with SQL?

:wq! PoC


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