How to calculate Input/Output Operations/Second (IOPS) for a large CA Performance Management (CAPM) deployment

Products

• CA Infrastructure Management
• CA Performance Management - Usage and Administration
• DX NetOps

Issue/Introduction

According to the DX NetOps Sizer, the requirement for disk input/output is a minimum of 320 MB/s overall and 40 MB/s per core. How can the IOPS be calculated?

Environment

DX NetOps CAPM all releases

Resolution

- Vertica recommends a disk block size of 4096 bytes (4K)

- In order to calculate the IOPS based on MB/sec or vice versa the following formulas could be used:

IOPS = (MBps Throughput/KB per IO) * 1024

Or

MBps = (IOPS * KB per IO) / 1024

 

Running the calculations using 320MB/sec as the required IO throughput gives:

IOPS = (320 / 4) * 1024 = 81920

The Vertica Vertica : vioperf utility can be used to validate the Disk I/O performance

Additional Information

Vertica : 10.1.x : Vertica in a Virtualized Environment

How to convert MBps to IOPS or calculate IOPS from MB/s