Performance Troubleshooting in Data ONTAP 7-Mode systems

Applies to

• Data ONTAP 8 7-Mode
• Data ONTAP 8.1 7-Mode
• Data ONTAP 8.2 7-Mode

Answer

QoS is not available in Data ONTAP 7-Mode systems; however, you can still collect some CLI data to review your current issue. Before you get into reviewing data, here are some common areas that might be beneficial:\n

• My CPU is high - is this bad?
  • For more information, see KB: What does high CPU utilization indicate?
• Why are my HDDs busy?
  • For more information, see the HDD Latency Troubleshooting KB: How to Assess Disk Response Times in ONTAP
• Some users experience a delay in accessing shares.
  • FPOLICY Troubleshooting KB: How to troubleshoot pBlk exhaustion due to Fpolicy Server
  • VSCAN Latency troubleshooting KB: How to troubleshoot pBlk exhaustion due to vscan server on Data ONTAP 8 7-Mode
  • Antivirus Scanning Best Practices TR

If none of these are applicable to your situation, call NetApp Support and open a support case. The following will help in case resolution:

• Detailed information regarding the issue at hand
• Shares, volumes, and nodes affected, and time stamps of when the issue occurred.
• Any error messages encountered, and where they were seen.
• Is the issue reproducible, random, or constant?
• When did the issue begin, and has anything in the environment changed recently?
• An example of a good problem statement:
  • "We are having an issue with increased read latency on volume XYZ at 9 am this morning. Previously, we saw 10ms, and now we see 40ms. This is impacting our main business application and causing us to lose revenue"

If you are using a version of Data ONTAP earlier than 8.3, collect a Perfstat while the issue is occurring:

• If you cannot capture while the issue is resident, attempt to capture the workload during a point in time which most closely resembles the time during which the issue occurred
  • How to collect a Perfstat? (-t5 and -i5 are suggested for the time and iteration variables)
  • For more information, see KB: Perfstat collection methods omnibus
• If you are on Data ONTAP 8.3 or above, send in a PerfArchive that covers the timeframe in question.
  • For more information on how to submit a PerfArchive, see KB: Performance Archives: Performance First Failure Data Collection for clustered Data ONTAP 8.3 and later

Additional Information

additionalInformation_text