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Dell PowerVault MD 32XX/36XX Series Storage Arrays CLI Guide

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Monitoring Performance

Monitor the performance of a storage array by using the save storageArray performanceStats command. This command saves performance information to a file that you can review to determine how well the storage array is running. The following table lists the performance information saved to the file.
Table 1. Storage Array Performance Information
Type of Information Description
Devices Devices are:
RAID Controller Modules The RAID controller module in slot 0 or 1 and a list of the virtual disks owned by the RAID controller module.
Virtual Disk A list of the virtual disk names.
Storage Array Totals A list of the totals for both RAID controller modules in an active-active RAID controller module pair, regardless if one, both, or neither are selected for monitoring
Total I/Os Number of total I/Os performed since the storage array was started
Read Percentage Percentage of total I/Os that are read operations (calculate the write percentage by subtracting the read percentage from 100 percent)
Cache Hit Percentage Percentage of reads that are fulfilled by data from the cache rather than requiring an actual read from a physical disk
Current KB/second Current transfer rate in kilobytes per second (current means the number of kilobytes per second since the last time the polling interval elapsed, causing an update to occur)
Maximum KB/second Highest data transfer value achieved in the current kilobyte-per-second statistic block
Current IO/second Current number of I/Os per second (current means the number of I/Os per second since the last time the polling interval elapsed, causing an update to occur)
Maximum IO/second Highest number of I/Os achieved in the current I/O-per-second statistic block
The general form of the command is: 
save storageArray performanceStats file="
                                    filename"
where, file is the name of the file in which you want to save the performance statistics. You can use any file name your operating system can support. The default file type is .csv. The performance information is saved as a comma-delimited file.

Before using the save storageArray performanceStats command, run the set session performanceMonitorInterval and set session performanceMonitorIterations commands to specify how often statistics are collected.

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