Dell EMC Unity: Best Practices for Best Performance ... · Dell EMC Unity: Best Practices for Best...

Dell EMC Unity: Best Practices for Best Performance Stephen Wright Performance Engineering Midrange & Entry Solutions Group

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Optimized for All-Flash Performance & Simplicity

What’s New with Dell EMC Unity

4 new Broadwell based All-Flash models New 80 drive 3U enclosure 4X file power with 256TB file system Compression for file AppSync integration, snapshots & thin

clones for iCDM Dynamic Pools

Up to 40% more cores; 2X the memory

650F

550F

450F

350F


Dell EMC Unity: Best Practices for Best Performance

What is “performance”? What are “Best Practices”? How has Best Practice guidance changed?

Dell EMC Unity All-Flash Considerations Dell EMC Unity Hybrid Considerations

Compression, Snapshots, Replication

Background

Hardware

Features


What is “Performance”?

Small transactions Bulk data

Individual transactions

Batch transactions

IOPS MB/s

Latency Response time

Window Job

The ability to do the

requested work in the

required period of time


What are “Best Practices”?

Configuration Guidance • Advice based on experience • Recommendations for options • Responsive to your application • Best behavior for your needs

Consideration Checklist

________

________

________


How are Best Practices Evolving

Dell EMC Unity Simplicity Dell EMC Unity drives intelligence into the storage system

Unified File and Block Same recommendations apply

Flash Changes the game for storage performance

One set of common guidance

Stress on other components

Remove need for detailed tweaking

Let the system do the right thing for you


Based on small-block random workloads

• NL-SAS • SAS 10K RPM • SAS 15K RPM • Flash

Recommended Maximum IOPS per Drive

SPEED LIMIT

150

SPEED LIMIT

250

SPEED LIMIT

350

SPEED LIMIT

20000

The Quantum Leap of Flash

• Do not use these numbers for sizing • Contact Dell EMC Representative


The Flash Effect, and CPU Utilization • Flash is fast, and Dell EMC Unity can support hundreds of drives

• Driving a lot of Flash can take a lot of CPU power

• We provide Best Practices around CPU utilization

Average CPU Utilization Below 50% 50% to 70% 70% to 90% Above 90%

Latency





0 10 20 30 40 50 60 70 80 90 100

Average CPU % Utilization

IOPSResponse Time






Latency

High Availability


Approaching Best Practices: AFA or Hybrid?

All-Flash Hybrid Features

• Compression • Snapshots • Replication • Both Block and File

• HDD performance can be determining factor

• A little Flash can add a lot of capability

• Drives are most likely not a bottleneck

• Focus on maximizing other hardware resources

Hardware Considerations

Best Practices Hardware Considerations


0 0.5 1 1.5 2 2.5 3 3.5

U3xx

U4xx

U5xx

U6xx

Dell EMC Unity Relative CPU Horsepower

New All-Flash Models Existing Models

All-Flash Considerations • With All-Flash, CPU becomes the driving factor

– CPU power has largest impact on achievable performance – Memory has largest impact on scalability

1X 2X

2.5X

3X


0 2 4 6 8 10 12 14 16 18

1

2

3

4

5

6

Num

ber o

f act

ive

SAS

buse

s

Maximum GB/s

0 2 4 6 8 10 12 14 16 18

1

2

3

4

5

6

Num

ber o

f act

ive

SAS

buse

s

Maximum GB/s

Balanced Access – Back-end SAS • At least use the 2 on-board!

– Maybe you also want the SAS expansion? (up to 6 buses)

• Largest impact is on bandwidth

Bottleneck shifts to

front-end ports

2 SAS ports per SP On-board I/O Module


Balanced Access – Front-end Ports • For HA, zone 1 initiator to 1

port from SPA, 1 port from SPB

• For HA + load balancing, zone to 2 ports per SP

• Cable and use as many front-end ports as possible

• We recommend at least 4 ports per SP in U3x0 and U4x0

• At least 6 ports per SP in U5x0 and U6x0

Host

Switch2

SPB SPA

Switch1

Host


Front-end Port Considerations

Speed is good!

Use faster ports when available

Understand port limits Consult Best

Practices Guide

Use more ports

Better distribution across cores

12 x 1,500 MB/s = 18,000 MB/s


Flash Tier FAST VP

All Previous Recommendations

Size for HDD Constraints

FAST Cache

Hybrid Considerations

5% = Flash Acceleration

Best Practices Feature Considerations


Host I/O RAID Snapshots Compression ReplicationHost I/O RAID Snapshots Compression Replication

Features Overview • In Dell EMC Unity, all system

resources are always available – Architectural philosophy – CPUs are not reserved for any

particular process

• Features require resources – Use additional CPU and may

add drive IOPS – CPU cycles can shift as

defined workload changes

80%

RAID

-1/0

RAID

-6

Add Snapshots

Add Com

pression

Add Replication


Decision Tree for Enabling Features • Understand that enabling a feature may increase CPU utilization

• This chart represents average CPU before implementing feature


Snapshots / Replication

Compression


Compression

>25% space savings from Compression

Good candidates for Compression

Low rate of data overwrite

Tolerant of latency fluctuations


Few Objects Several Objects Many Objects

Snapshots

12 h

ours

12 hours

12 h

ours

12 hours

12 h

ours

12 hours

8 hours

8 hours

4 ho

urs 4 hours

• Use less aggressive snapshot schedules

• Stagger snapshot schedules


Asynchronous Replication • Asynchronous Replication leverages Snapshots

– Similar considerations – Recovery Point Objective = snapshot schedule – Longer RPOs with lots of replicated objects

• Consider port capabilities – Multiple links per SP – Higher speed ports

8 hours

RPO

12 h

ours

12 hours

RPO


Synchronous Replication • Real-time replication over Fibre Channel link

• Latency is key

• Zone so that clients are not on the replication link

Storage Processor

Replication Link

Best Practices Conclusions


Dell EMC Unity Best Practices: Summary

Appropriate Model

Enough Hardware

Plan for Features

Flash Acceleration

Start with Flash All-Flash Flash tier (Hybrid)

Consider CPU consumption Snapshot schedules Replication RPOs

Have enough…? Drives Enclosures Ports Utilize all ports

Choose the right model, based on CPU power Data-in-place upgrades to move to more powerful model For All-Flash, consider new Ux50F models


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Booth #347


Related Sessions for SC and Dell EMC Unity Series Session Title Day/Time Dell EMC Unity & SC Series: Midrange Storage Portfolio Overview Mon @ 12:00 PM + Wed @ 01:30 PM CloudIQ: Cloud-Based Storage Analytics for Dell EMC Unity and SC Series Mon @ 04:30 PM + Wed @ 08:30 AM Dell EMC Unity All-Flash: What’s New Tue @ 03:00 PM + Wed @ 01:30 PM Dell EMC Unity: Architectural Overview Mon @ 01:30 PM + Thu @ 08:30 AM Dell EMC Unity: Best Practices For Best Performance Wed @ 08:30 AM + Thu @ 10:00 AM Dell EMC Unity: Performance Analysis Deep Dive Wed @ 03:00 PM + Thu @ 01:00 PM Dell EMC Unity: Next Generation NAS & File Capabilities Mon @ 03:00 PM + Thu @ 11:30 AM Dell EMC Unity: Data Protection & Copy Management Options Mon @ 08:30 AM + Wed @ 12:00 PM Dell EMC Unity: Virtualization & Cloud Integration Mon @ 12:00 PM Dell EMC Unity: Migration From VNX Tue @ 08:30 AM Dell EMC Unity: Using Dell EMC UnityVSA In Converged Environments Mon @ 08:30 AM Dell EMC Unity All Flash: Flash Technology Deep Dive Mon @ 08:30 AM + Thu @ 01:00 PM SC Series: What's New Mon @ 04:30 PM + Tue @ 03:00 PM SC Series: Architectural Overview Mon @ 01:30 PM + Tue @ 03:00 PM SC Series: Performance Best Practices Mon @ 04:30 PM + Thu. @ 01:00 PM SC Series: Affordable Data Mobility & Business Continuity With Multi-Array Federation Mon @ 08:30 AM + Thu @ 01:00 PM SC Series: Virtualization & Ecosystem Integrations Wed @ 03:00 PM + Thu @ 08:30 AM


Hands on Labs for SC and Dell EMC Unity Series Self-Paced Day/Time

Dell EMC Dell EMC Unity CloudIQ – Event Correlation & Analytics

Monday: 8:30AM – 9:00PM

Tuesday: 7:00AM – 5:30PM

Wednesday: 7:00AM – 5:00PM

Thursday: 7:00AM – 2:00PM

Dell EMC Dell EMC Unity – Simplified Storage Management & Administration

Dell EMC Dell EMC Unity – VMware vSphere Integration

Dell EMC Dell EMC Unity – Configuring Snapshots & Replication

SC Series: Introduction to SC Series and Dell Storage Manager

Guided Day/Time

Dell EMC Dell EMC Unity CloudIQ – Event Correlation & Analytics (Registration required and limited availability)

Tuesday: 1:30PM – 2:30PM

Thursday: 8:30AM – 9:30AM


Thank You for Attending

PLEASE TAKE A MOMENT TO • Visit the Storage & Data Protection Booth • Tweet: @DellEMCStorage

A STAR IS BORN • Shoot an in-room 10 second reference video

(where applicable)

Talk with us in the booth about the:

Modern Infrastructure Assessment &

Storage Efficiency Guarantee

SITES TO BE SEEN • Efficiency Guarantee: dellemc.com/4to1guarantee • CloudIQ: dellemc.com/cloudiq • All-Flash Storage: dellemc.com/all-flash

http://www.dellemc.com/4to1guarantee

http://www.dellemc.com/cloudiq

http://www.dellemc.com/all-flash

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