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September 14th, 2018 01:00

How to calculate IOPs for a VNX?

Hi everybody,

I have a VNX 5300, I'd like to calculate total IOPs for the whole vnx system. In VNX M&R I did a graph who show me the total IOPs for vnx, I'd to know if is it possible to monitor this value with a script because I need to set up a limit of 20k IOPs with an "alarm". I have seen from other posts i can extract IOPs in several ways:

- From Analyzer in Unisphere in .nar files to generate then a .csv

- Navisecli with the command "lun -list -perfData" show me some values about each LUNs, I don't understand the output values, the number of ReadRequest means what?:

LOGICAL UNIT NUMBER 5

Name:  LUN 5

Statistics Logging Current Time:  09/14/18 10:19:09

Read Requests:  981676235

Read Requests SP A:  112700

Read Requests SP B:  981563535

Write Requests:  580551036

Write Requests SP A:  7282

Write Requests SP B:  580543754

Blocks Read:  3977621538

Blocks Read SP A:  11405534

Blocks Read SP B:  3966216004

Blocks Written:  1202898310

Blocks Written SP A:  283496

Blocks Written SP B:  1202614814

Busy Ticks:  2810064887

Busy Ticks SP A:  575033183

Busy Ticks SP B:  2235031704

Idle Ticks:  3147545736

Idle Ticks SP A:  35915246

Idle Ticks SP B:  3111630490

Sum of Outstanding Requests:  2400856776

Sum of Outstanding Requests SP A:  188242

Sum of Outstanding Requests SP B:  2400668534

Non-Zero Request Count Arrivals:  421951318

Non-Zero Request Count Arrivals SP A:  45533

Non-Zero Request Count Arrivals SP B:  421905785

Implicit Trespasses:  0

Implicit Trespasses SP A:  0

Implicit Trespasses SP B:  0

Explicit Trespasses:  10

Explicit Trespasses SP A:  5

Explicit Trespasses SP B:  5

Can you suggest me the easiest way to get this value from vnx system?

Thanks for your help,

A.

4.5K Posts

September 28th, 2018 08:00

I don't believe there is any easy way to do this in real-time. The closest thing I can think of is using the Quality of Service (QOS) to set limits on the LUNs so that LUN IOPS don't exceed a certain upper limit. In Unisphere Help, search for QOS. That should provide an overview of what you can do.

The Read/Write Requests are the IOPS. I believe that these counters continue incrementing.

glen

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