Solved

Calculating IOPS on physical server as virtualization candidate.

Posted on 2011-03-01
5
1,492 Views
Last Modified: 2012-08-14
I am working a project where I need to virtualize 30 existing physical servers.

I have collected perfmon data over the last week using logman including physical and logical disk counters.

I am currently looking at disk reads/sec and disk writes/sec, but these numbers aren't adding up to IOPS.    For example I have 1 server with a RAID1.  Perfmon says the reads/sec had an average of 6/sec over the last week, but the maximum was 656/second.   But this can't possibily be right if the maximum (without solid state drives) would be about 150-180/IOPS per second.

What microsoft counters can I use to calculate the average IOPS usage per logical or physical disk without having direct access to the physical hardware.
0
Comment
Question by:USWired
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 34

Expert Comment

by:Michael-Best
ID: 35011645
0
 
LVL 5

Assisted Solution

by:chkdsk01
chkdsk01 earned 250 total points
ID: 35011957
If you already have a vCenter server you can install the guided consolidation plugin.  This lets you monitor performance of physical servers and it will give you a confidence rating showing you if the servers are good virtualization candidates.  I wouldn't use this entirely to base my judgement, but it helps.
0
 
LVL 30

Accepted Solution

by:
Duncan Meyers earned 250 total points
ID: 35012410
You're on the right track. The most likely reason that you're seeing a peak of 656 IOPS on a mirrored pair is that RAID controller cache (or on-disk cache for that matter) has handle the peak workload.

You are correct regarding 150 to 180 IOPS But this is a sizing number. That is; your disks will handle 180 IOPS day in, day out without breaking a sweat. They'll handle up to 2 to 2.5 times that workload before response times become unacceptable, so you could see 360 to 450 IOPS per drive for 15k scsi or SAS drives.
0
 

Author Comment

by:USWired
ID: 35013137
Actually I found the numbers I was looking for which was Physical Disk - Disk Reads/sec and Disk Writes/sec as opposed to Logical Disk - Disk Reads/sec and Disk Writes/sec.
0
 
LVL 30

Expert Comment

by:Duncan Meyers
ID: 35013185
Thanks! Glad I could help.
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
vmware workstation slow 39 112
Extending VM Disk to be larger than 2 TB ? 11 101
Cannot unmount datastore 5 67
VAAI  technology 2 58
In this article, I will show you HOW TO: Perform a Physical to Virtual (P2V) Conversion the easy way from a computer backup (image).
This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
Advanced tutorial on how to run the esxtop command to capture a batch file in csv format in order to export the file and use it for performance analysis. He demonstrates how to download the file using a vSphere web client (or vSphere client) and exp…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question