Disk Read and Write Request Counters

Real-time performance monitoring and troubleshooting

Disk Read and Write Request Counters

Veeam Logoby squirrelking » Wed Mar 11, 2009 10:46 pm

The user guide says that the Disk Read and Write Request Counters mean:
Disk Write Requests: Number of times data was written to disk in the defined interval.
Disk Read Requests: Number of times data was read from the disks in the defined interval.

But how does this equate to IO's per Second (IOPS) or some other "standard" disk measurement that storage vendors use?

Thanks!
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Re: Disk Read and Write Request Counters

Veeam Logoby Gostev » Thu Mar 12, 2009 11:42 am

Hello, in Veeam Monitor displays standard performance counter provided to us by VMware... I am not sure how they translate to vendor-specific counters. I will try to find this out for you when the dev lead returns from vacation.
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Re: Disk Read and Write Request Counters

Veeam Logoby Veeam-dsiles » Fri Mar 13, 2009 11:52 pm

IO counts are reported in VMware vCenter are reported as disk.numberRead.summation and disk.numberWrite.summation. These values are brought into Veeam Monitor through the API and can be converted to IOPS by dividing by the sample window. If you want total IOPS and you have an hour view, take the total of your read operations and write operations and divide by 3600 to get to IO per second. If you want IOPS for either category, you divide the appropriate counter by the 3600 value.

Just be sure you are aware of the period of the sample. Here is a reference to the VMware wiki with an overview of the performance counters. http://communities.vmware.com/docs/DOC-5600

Regards,

Dave
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