Lars EjskjaerGreg Ferguson

TR 1-470Performance Analysis for Dummies

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Understanding Performance Analysis Can Help You Sell− Gain better understanding of your customers environment

− Grow awareness to possible system bottleneck areas

− Understand changes that can enhance your customers overall satisfaction

Getting Started…

Simple Analysis (1, 2, 3)

Valuable Tools and Resources

Agenda

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”My storage is slow…”

The Customer Problem

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Guide the customer to best practices

Recommend solutions

− Administrative

− Product

Provide advice in the context of their environment

Your Goal

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Understanding of how the customer’s environment was set up

Ability to identify missed best practices

− Administrative

− Performance

Ability to identify common performance issues

What You Will Need To Know

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Getting Started

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Easily Collect Performance Data - Perfstathttps://communities.netapp.com/docs/DOC-16209

Pro Tip:

Perform multiple smaller iterations versus one larger iteration for better visibility

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Loading Data into LatX for Analysis https://latx.netapp.com/

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Find and View the Perfstat

NetApp Confidential – Limited Use

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Finding Specific Data

Pro Tip

Use PRESTATS iteration 1 for configuration information

Use POSTSTATS for performance measurements

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Understand Configuration− Aggregates − Volumes− Look for configuration errors

Analyze Performance− System− Disk− Flash

Make Recommendations

Analysis Strategy

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Disk Configuration

The Simple Analysis Part 1

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Disk Types on the Controller

Pro Tip

Common disk types today: SAS, BSAS, MSATA

Prestats - sysconfig -r

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RAID Groups

Pro Tip

Avoid unbalanced raid-groups in aggregates!

Poststats – statit

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32-bit vs 64-bit Aggregates

Pro Tip

New features work best (require) with 64-bits aggregates Using one aggregate type makes the customer operations easier

Prestats – aggr status -v

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Aggregate UtilizationPoststats - df –A -h

Pro Tip

An aggregate which is 80% full, should be monitored Aggregates over +90% full could impact performance

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Aggregate Snapshot Copies Prestats - df –A –h, snap status -A & aggr status –v

NetApp Confidential – Limited Use

Pro Tip

Only SyncMirror and MetroCluster use aggregate snapshots

If not in use: - Remove schedule- Release space reservation

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Volumes

The Simple Analysis Part 2

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Volume Space UtilizationPoststats - df & lun stat –v all (or vol status –v)

Pro Tip

Databases like Oracle initialize their data files or data could be static so it could be fine that the volume is almost full

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DeduplicationPoststats- stats perfstat_sis

Pro Tip

Savings less than 6-8% are just using resources without a real effect, unless data is static, turn it off and save resources!

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Deduplication RuntimesPoststats - sis status -l

Pro Tip

Deduplication is a low priority process but it still occupies system resourcesWork to understand run times to smooth system scheduling for better performance

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MisalignmentPoststats - nfsstat –d & lun stat –v all

Pro Tip

Understand what is in these files/LUNsLogfiles are often ”misaligned”Verify that virtual machines are aligned

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System Performance

The Simple Analysis Part 3

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ONTAP breaks work into groups of processes called domains

ONTAP schedules work across CPU cores as IT sees best

This can be seen in Sysstat –M

Detailed analysis of this is an advanced topic

What Are Domains In Data ONTAP?

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CPU UtilizationPoststats - sysstatM.out

Pro Tip:

Average CPU utilization >70% depicts a very busy controllerCPU Utilization is a generally poor indicator of performanceLook at AVG CPU – Single CPU (thread) utilization is very informative

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Writing Data to Disk - CP Type & TimePoststats – sysstat_1sec.out

Pro Tip

Deferred Back-to-back CP’s are performance killers (type #)- Data can’t get to disk fast enoughInvestigate (ignoring the CPU utilization):- Mis-alignment- Disk over commitedSolutions:- Move load to another controller/aggregate- Add disks/Flash Cache

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Aggregate Disk UtilizationPoststats - statit

Pro Tip

Analyze performance impact based on drive utilization (by drive type)- SATA drives > 50% = busy- SAS drives > 60% = busyStatit will give clues about where to move load to

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Active VolumesPerfsys Report

Pro Tip

Map volumes to aggregates (aggr status –v) Identify workloads to move

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FlashCachePerfsys Report

Pro Tip

Verify that the system is benefiting from the use of FlashCacheUse PCS and perfstat to verify a customers gains by use of FlashCache

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Latency in the EnvironmentPoststats - stats perfstat_cifs/_nfs/_fcp

Pro Tip

High latency = performance impactLatency requirements vary by applicatonAnalyze the workload and- Add Disk- Add FlashCache- Upgrade the Controllers

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We reviewed− High disk I/O’s− Busy volumes − Disk configuration issues− Average CPU utilization− Potential Flash Cache benefits− Mis-alignments

Review of Findings

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Resolve mis-alignments

Consider moving busy volumes

Add drives and reallocate to even out raid groups

Add Flash Cache

Upgrade Controllers

Add more Controllers within Clustered Data ONTAP

Recommendations

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Don’t be afraid – performance is no longer such a mystery!

Now YOU Can Better Understand System Performance

Have FUN!

Most importantly, monitor disk utilization!

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The Community site− http://communities.netapp.com

ONTAP documentation (particularly ONTAP Command ref)− http://support.netapp.com

Latx – your analysis tool− http://latx.netapp.com

Important Resources

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Complimentary Sessions

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TR-2-315 A Field Guide to Sizing - Part 1 TR-3-317 A Field Guide to Sizing – Part 2

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