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

Monitoring and Testing Monitoring and Testing I/OI/OUsing Perfmon, Oracle tools and Using Perfmon, Oracle tools and IOMeter for monitoring and load IOMeter for monitoring and load testing the I/O Subsystemtesting the I/O Subsystem

ObjectivesObjectives

At the end of this module the student will At the end of this module the student will understand the following tasks and understand the following tasks and concepts.concepts.

Monitoring the I/O Subsystem using Monitoring the I/O Subsystem using PerfmonPerfmon

Monitoring the I/O Subsystem using Monitoring the I/O Subsystem using Oracle ToolsOracle Tools

Load Testing the I/O Subsystem using Load Testing the I/O Subsystem using TTCPTTCP

Oracle and I/OOracle and I/O I/O performance is crucial to I/O performance is crucial to

Oracle PerformanceOracle Performance Data buffers are sensitive to read Data buffers are sensitive to read

I/O latencyI/O latency Log buffers are sensitive to write Log buffers are sensitive to write

I/O latencyI/O latency

Oracle I/O ProblemsOracle I/O ProblemsPerformance DegradationPerformance Degradation Index lookupIndex lookup

10 I/Os10 I/Os 10 x 6 ms = 60 ms (not bad)10 x 6 ms = 60 ms (not bad) 10 x 100 ms = 1 sec (noticeable)10 x 100 ms = 1 sec (noticeable)

Table ScanTable Scan 30,000 I/Os30,000 I/Os

30,000 x 6 ms = 90 sec (not bad for a Table 30,000 x 6 ms = 90 sec (not bad for a Table Scan)Scan)

30,000 x 100 ms = 3,000 sec = 50 minutes30,000 x 100 ms = 3,000 sec = 50 minutes You are getting phone calls and emailsYou are getting phone calls and emails

Monitoring I/O PerformanceMonitoring I/O PerformancePerfmonPerfmon General TipsGeneral Tips

Set the sample rate upSet the sample rate up 1 sec is too fast1 sec is too fast

Not accurate on all countersNot accurate on all counters Not enough time to see all the countersNot enough time to see all the counters Way to fast for saving the dataWay to fast for saving the data Heizenburg Uncertainty PrincipleHeizenburg Uncertainty Principle

Use both graph and report as Use both graph and report as appropriateappropriate

Save data if possibleSave data if possible

Monitoring I/O Monitoring I/O PerformancePerformancePerfmonPerfmon Logical Disk CountersLogical Disk Counters

Lists the Physical Disks by Drive Lists the Physical Disks by Drive LetterLetter Good for monitoring file I/OGood for monitoring file I/O

Physical Disk CountersPhysical Disk Counters Lists the Physical Disks by Physical Lists the Physical Disks by Physical

DiskDisk Good for monitoring the LUNs or Good for monitoring the LUNs or

VolumesVolumes

Monitoring I/O Monitoring I/O PerformancePerformancePerfmonPerfmon LatenciesLatencies IOPS (I/Os Per Second)IOPS (I/Os Per Second) ThroughputThroughput I/O sizesI/O sizes

Monitoring I/O Monitoring I/O PerformancePerformancePerfmonPerfmon LatenciesLatencies

Avg. Disk sec/ReadAvg. Disk sec/Read Provides Read Latency StatisticsProvides Read Latency Statistics

Avg. Disk sec/WriteAvg. Disk sec/Write Provides Write Latency StatisticsProvides Write Latency Statistics

Monitoring I/O PerformanceMonitoring I/O PerformanceLatencyLatency

Monitoring I/O Monitoring I/O PerformancePerformancePerfmonPerfmon IOPSIOPS

Disk Reads/secDisk Reads/sec Disk Transfers/secDisk Transfers/sec

Useful for total volume IOPS Useful for total volume IOPS (remember RAID overhead)(remember RAID overhead)

Disk Writes/secDisk Writes/sec

Monitoring I/O Monitoring I/O PerformancePerformanceIOPSIOPS

Monitoring I/O Monitoring I/O PerformancePerformancePerfmonPerfmon ThroughputThroughput

Disk Bytes/secDisk Bytes/sec Total ThroughputTotal Throughput

Disk Read Bytes/secDisk Read Bytes/sec Disk Write Bytes/secDisk Write Bytes/sec

Monitoring I/O Monitoring I/O PerformancePerformanceThroughputThroughput

Monitoring I/O Monitoring I/O PerformancePerformancePerfmonPerfmon I/O sizesI/O sizes

Avg. Disk Bytes/ReadAvg. Disk Bytes/Read Avg. Disk Bytes/WriteAvg. Disk Bytes/Write

Monitoring I/O Monitoring I/O PerformancePerformanceI/O SizesI/O Sizes

Monitoring I/O Monitoring I/O PerformancePerformancePerfmonPerfmon MiscellaneousMiscellaneous

Current Disk Queue LengthCurrent Disk Queue Length

Monitoring I/O Monitoring I/O PerformancePerformanceOracle ToolsOracle Tools OEM OEM

Performance Performance PagePage Instance Disk I/OInstance Disk I/O Instance Instance

ThroughputThroughput

Monitoring Monitoring I/OI/O Performance PerformanceOracle ToolsOracle Tools

Oracle Counters for Oracle Counters for Windows Windows Performance Performance MonitorMonitor Add Oracle Data Add Oracle Data

Files counter Files counter physreads/secphysreads/sec Physwrites/sePhyswrites/se

Choose data files to Choose data files to monitormonitor

Shows I/O for Shows I/O for database filesdatabase files

Monitoring I/O Monitoring I/O PerformancePerformanceOracle ToolsOracle Tools STATSPACK ReportsSTATSPACK Reports

Tablespace IO StatsTablespace IO Stats Data File IO StatsData File IO Stats

Load Testing I/OLoad Testing I/O Used to determine I/O problems Used to determine I/O problems

in a controlled and scientific in a controlled and scientific mannermanner

Used to identify the upper limits Used to identify the upper limits of the storage subsystemof the storage subsystem

Used to prove or disprove Used to prove or disprove hypothesis or theorieshypothesis or theories

Load Testing I/OLoad Testing I/OIOMeterIOMeter IOMeter is a public domain utilityIOMeter is a public domain utility Available at Available at

http://www.sourceforge.nethttp://www.sourceforge.net Generates I/O based on your Generates I/O based on your

specificationsspecifications Provides accurate resultsProvides accurate results Is repeatableIs repeatable

Load Testing I/OLoad Testing I/OIOMeterIOMeter Made up of two major Made up of two major

componentscomponents GUIGUI

Used for configuration and resultsUsed for configuration and results DynamoDynamo

Used to generate the loadUsed to generate the load

Load Testing I/OLoad Testing I/OIOMeterIOMeter Configuring IOMeterConfiguring IOMeter

Disk TargetsDisk Targets Network TargetsNetwork Targets Access SpecificationsAccess Specifications Results DisplayResults Display Test SetupTest Setup

Load Testing I/OLoad Testing I/ODisk TargetsDisk Targets Maximum Disk SizeMaximum Disk Size

For random I/Os this must be For random I/Os this must be sufficiently largesufficiently large

# of Outstanding I/Os# of Outstanding I/Os Defines concurrency of I/OsDefines concurrency of I/Os If set to one there will only be one If set to one there will only be one

I/O issued at a time and IOPS = 1 / I/O issued at a time and IOPS = 1 / latencylatency

Load Testing I/OLoad Testing I/ONetwork TargetsNetwork Targets Used for network I/O testingUsed for network I/O testing

Load Testing I/OLoad Testing I/OAccess SpecificationsAccess Specifications Specifies the type of I/OSpecifies the type of I/O

Block SizeBlock Size Read/Write ratioRead/Write ratio Sequential/Random RatioSequential/Random Ratio Create new spec for OracleCreate new spec for Oracle

Load Testing I/OLoad Testing I/OTest SetupTest Setup Used to set up automated testsUsed to set up automated tests

Run timeRun time Ramp upRamp up Number of workersNumber of workers Etc.Etc.

Load Testing I/OLoad Testing I/OResults DisplayResults Display View the performance during the View the performance during the

testtest IOPSIOPS ThroughputThroughput LatencyLatency CPU UtilizationCPU Utilization

ReviewReview

What type of I/O problem causes the What type of I/O problem causes the biggest problem with Oracle Data Files ?biggest problem with Oracle Data Files ?

Name some Perfmon counters to monitor Name some Perfmon counters to monitor for I/O?for I/O?

What counter does the Oracle Counters What counter does the Oracle Counters for Windows Performance Monitor add to for Windows Performance Monitor add to Perfmon that measures Oracle I/O?Perfmon that measures Oracle I/O?

What are the two components of What are the two components of IOMeter?IOMeter?

SummarySummary Monitoring the I/O Subsystem using Monitoring the I/O Subsystem using

PerfmonPerfmon Monitoring the I/O Subsystem using Monitoring the I/O Subsystem using

Oracle ToolsOracle Tools Load Testing the I/O Subsystem using Load Testing the I/O Subsystem using

TTCPTTCP