1 / 30

Monitoring and Testing I/O

Monitoring and Testing I/O. Using Perfmon, Oracle tools and IOMeter for monitoring and load testing the I/O Subsystem. Objectives. At the end of this module the student will understand the following tasks and concepts. Monitoring the I/O Subsystem using Perfmon

yule
Télécharger la présentation

Monitoring and Testing I/O

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Monitoring and Testing I/O Using Perfmon, Oracle tools and IOMeter for monitoring and load testing the I/O Subsystem

  2. Objectives At the end of this module the student will understand the following tasks and concepts. • Monitoring the I/O Subsystem using Perfmon • Monitoring the I/O Subsystem using Oracle Tools • Load Testing the I/O Subsystem using TTCP

  3. Oracle and I/O • I/O performance is crucial to Oracle Performance • Data buffers are sensitive to read I/O latency • Log buffers are sensitive to write I/O latency

  4. Oracle I/O ProblemsPerformance Degradation • Index lookup • 10 I/Os • 10 x 6 ms = 60 ms (not bad) • 10 x 100 ms = 1 sec (noticeable) • Table Scan • 30,000 I/Os • 30,000 x 6 ms = 90 sec (not bad for a Table Scan) • 30,000 x 100 ms = 3,000 sec = 50 minutes • You are getting phone calls and emails

  5. Monitoring I/O PerformancePerfmon • General Tips • Set the sample rate up • 1 sec is too fast • Not accurate on all counters • Not enough time to see all the counters • Way to fast for saving the data • Heizenburg Uncertainty Principle • Use both graph and report as appropriate • Save data if possible

  6. Monitoring I/O PerformancePerfmon • Logical Disk Counters • Lists the Physical Disks by Drive Letter • Good for monitoring file I/O • Physical Disk Counters • Lists the Physical Disks by Physical Disk • Good for monitoring the LUNs or Volumes

  7. Monitoring I/O PerformancePerfmon • Latencies • IOPS (I/Os Per Second) • Throughput • I/O sizes

  8. Monitoring I/O PerformancePerfmon • Latencies • Avg. Disk sec/Read • Provides Read Latency Statistics • Avg. Disk sec/Write • Provides Write Latency Statistics

  9. Monitoring I/O PerformanceLatency

  10. Monitoring I/O PerformancePerfmon • IOPS • Disk Reads/sec • Disk Transfers/sec • Useful for total volume IOPS (remember RAID overhead) • Disk Writes/sec

  11. Monitoring I/O PerformanceIOPS

  12. Monitoring I/O PerformancePerfmon • Throughput • Disk Bytes/sec • Total Throughput • Disk Read Bytes/sec • Disk Write Bytes/sec

  13. Monitoring I/O PerformanceThroughput

  14. Monitoring I/O PerformancePerfmon • I/O sizes • Avg. Disk Bytes/Read • Avg. Disk Bytes/Write

  15. Monitoring I/O PerformanceI/O Sizes

  16. Monitoring I/O PerformancePerfmon • Miscellaneous • Current Disk Queue Length

  17. Monitoring I/O PerformanceOracle Tools • OEM Performance Page • Instance Disk I/O • Instance Throughput

  18. Monitoring I/O PerformanceOracle Tools • Oracle Counters for Windows Performance Monitor • Add Oracle Data Files counter • physreads/sec • Physwrites/se • Choose data files to monitor • Shows I/O for database files

  19. Monitoring I/O PerformanceOracle Tools • STATSPACK Reports • Tablespace IO Stats • Data File IO Stats

  20. Load Testing I/O • Used to determine I/O problems in a controlled and scientific manner • Used to identify the upper limits of the storage subsystem • Used to prove or disprove hypothesis or theories

  21. Load Testing I/OIOMeter • IOMeter is a public domain utility • Available at http://www.sourceforge.net • Generates I/O based on your specifications • Provides accurate results • Is repeatable

  22. Load Testing I/OIOMeter • Made up of two major components • GUI • Used for configuration and results • Dynamo • Used to generate the load

  23. Load Testing I/OIOMeter • Configuring IOMeter • Disk Targets • Network Targets • Access Specifications • Results Display • Test Setup

  24. Load Testing I/ODisk Targets • Maximum Disk Size • For random I/Os this must be sufficiently large • # of Outstanding I/Os • Defines concurrency of I/Os • If set to one there will only be one I/O issued at a time and IOPS = 1 / latency

  25. Load Testing I/ONetwork Targets • Used for network I/O testing

  26. Load Testing I/OAccess Specifications • Specifies the type of I/O • Block Size • Read/Write ratio • Sequential/Random Ratio • Create new spec for Oracle

  27. Load Testing I/OTest Setup • Used to set up automated tests • Run time • Ramp up • Number of workers • Etc.

  28. Load Testing I/OResults Display • View the performance during the test • IOPS • Throughput • Latency • CPU Utilization

  29. Review • What type of I/O problem causes the biggest problem with Oracle Data Files ? • Name some Perfmon counters to monitor for I/O? • What counter does the Oracle Counters for Windows Performance Monitor add to Perfmon that measures Oracle I/O? • What are the two components of IOMeter?

  30. Summary • Monitoring the I/O Subsystem using Perfmon • Monitoring the I/O Subsystem using Oracle Tools • Load Testing the I/O Subsystem using TTCP

More Related