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Which disk performance monitors should be measured?

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Question

Which disk performance monitors should be measured?

Answer

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Question

Which disk performance monitors should be measured?

Answer

See Tealeaf Documentation Topic:? How to tell if the disks are I/O limited Tealeaf Troubleshooting Guide Chapter 8. ?? The solution explains how to determine if your disks are creating a performance bottleneck:
  1. Run the Windows PerfMon utility.
  2. If the Average Disk Queue Length counter is not already displayed right-click the right pane and select Add counters.
  3. In the Performance Object drop-down select Physical Disk.
  4. In the rightmost set of radio buttons select All instances.
  5. In the left pair of radio buttons select? Select counters from list.
  6. Multi-select the following three counters from the list box:
  • Avg Disk Queue Length
  • Avg Disk Read Queue Length
  • Avg Disk Write Queue Length

Continue with steps:

  1. Click Add.
  2. Look at the results in the perfmon right pane.
  3. Focus on the disks that house the Canister Databases directory and the Indexes directory.
  • Average queue lengths should be less than 1.
  • Queue lengths of 4 or greater means the disk is I/O bound.
  • Average queue lengths of 4 or more are a strong indication that the system's disk drives need re-partitioning along the guidelines of the article "Configuring the RAID Hard Disk Drive (HDD) Array".
If your system is configured according to the standards of the above article does not use RAID and has high average queue lengths the solution is to move to a faster disk subsystem or add additional Tealeaf servers.? The current system does not have the disk I/O bandwidth to handle the data processing load presented to it.

Article Reference
00001173

Applies to version(s):? 7.0;7.1;7.2;8.0;8.1

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Document Information

Modified date:
08 December 2018

UID

ibm10776985

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