rethinking storage infrastructures by utilizing the value of flash

Rethinking Storage Infrastructures by Utilizing the Value of Flash

Adam Roberts - Engineering Fellow,

SanDisk Corporation | A Western Digital Company

August 10, 2016

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Flash Memory Summit 2016

Santa Clara, CA

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Forward Looking Statements

During our meeting today, we may make forward-looking statements.

Any statement that refers to expectations, projections, or other characterizations of future events or circumstances is a forward-looking statement, including those relating to industry trends, expectations that flash will continue to make gains in data centers, and expectations regarding all-flash data centers. Risks that may cause these forward-looking statements to be inaccurate include among others: industry trends may not evolve as expected, flash may not continue to make gains in data centers as expected, and expectations for the advance of flash over HDD in data centers may be inaccurate; or the other risks detailed from time-to-time in SanDisk Corporation’s and Western Digital Corporation’s Securities and Exchange Commission filings and reports, including, but not limited to, their respective quarterly reports on Form 10-Q for the most recently completed fiscal quarter.

This presentation contains statements from third parties. We undertake no obligation to update these forward-looking statements, which speak only as of the date hereof or the date of issuance by a third party, as applicable


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Better UBER

– Allows simplification of RAID configs

Performance margin used for paritycalculations

Hardware Consolidation

– Result of:

• UBER

• Performance

• High capacity point per SSD

– Lower solution costs result

Optimizing Storage Tiers

– Low cost moderate performing SSDs allow for replacing HDD/SSD Hybrid arrays with all flash solutions

Flash Value and Affect


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What is UBER?

• UBER stands for Uncorrectable Bit Error Rate

• UBER quantifies the chance that a bit of data cannot be retrieved from the media, due to

an uncorrectable error that happened while the data was stored or during retrieval

• An UBER of 10-15 means that 1 in every 1015 data reads, an uncorrectable error will

occur

• Enterprise SSDs, depending on the device chosen, are anywhere from 10x to 10,000x less

likely to exhibiting an uncorrectable bit error versus enterprise HDDs.*

Hint: It has nothing to do with cars!


Santa Clara, CA *https://www.sandisk.com/business/datacenter/products/flash-devices/ssds/sas-ssd/lightning-gen2

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UBER SanDisk Enterprise SSDs

UBER

Rate

SanDisk Enterprise SSD Reliability

Benefit

SanDisk/WD

Enterprise SSD10-18 Best in Class. How does it compare?

Let’s take a look!

Enterprise SSD 10-17 10x Better than competing Enterprise

SSDs

Enterprise HDD 10-16 100x Better than Enterprise HDD

Client SSD 10-15 1000x Better than Client SSD

Note: SanDisk has some specific products that meet even higher UBER at 10-19 and 10-20 in the Lightning Ultra Gen II and the

Fusion IO PCIe cards respectively


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Uncorrectable Bit Error Rate Approaches Zero

0

20

40

60

80

100

120

Average Bit Loss per10x1^18 transactions

EnterpriseHDD

EnterpriseSSD

SanDisk/WDEnterpriseSSD

As UBER approaches zero, expensive redundancy methods put in place to protect from it can be lessened

• Reduces the need for RAID or redundancy

• Employ frequent snapshots for some use cases

• Remove the need for double buffered writes in databases, receiving over 2x performance boost

• Allows RAID configuration simplifications

• Erasure coding simplified to RAID 6 or RAID 5

• RAID 6 simplified to RAID 5

• Acts simply as a tie breaker for choosing the best drive!Flash Memory Summit 2016

Santa Clara, CA

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• Performance Access Density = IOPS/GB

• Higher Access Density can lead to higher HW consolidation

• RAID protection levels affect Access Density

• HDD performance limitations limit device capacity growth

• SSD device capacity continues to grow since application performance access density

needs can still be met

Performance access density needs drive flash adoption


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= 1 drive

Red = redundancy overhead Blue = usable capacity

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Example: Improving Access Density and Reducing

RAID overhead Data Protection overheadAKA “unusable purchased capacity”

50% protection overhead

20% protection overhead

• (24) 1.2 TB HDDs• Usable capacity 14.4 TB

• (5) 3.84 TB SSDs• Usable capacity 15.36 TB• More capacity and 10x better

UBER (Uncorrectable Bit Error Rate) than the HDD solution (5 drives) RAID 5

(24 drives) RAID 10


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2-Tier HDD/SSD Solution vs 1-Tier SSD Solution

SSD Performance margin and better UBER can allow Simplification of Tiers


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With the advantages described can flash take over the datacenter?

Probably not• Flash has and will continue to make huge progress and gains in the datacenter

• HDDs can cover some warm and most cold data at a very efficient cost

• At least for now… the two exist side by side


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Flash Pool

10k HDDModerate SSD Pool

7.2k HDD Pool

Data migration thru the lakes add to overall endurance needs, affecting flash cost

Hot Data

Warm Data

Cold Data

Data is pulled downward to a cooler tier based on age and/or access frequency

Dead Data


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Summary:

All Flash datacenter is possible if data set is all hot or warm

For everyone else low cost, low performance HDD solutions will

exist alongside SSD solutions for quite some time

SSDs will absolutely continue to increase footprint as a viable

alternative to HDDs

SanDisk Confidential 14

© 2016 Western Digital Corporation or its affiliates. All rights reserved. SanDisk and the SanDisk logo are trademarks of Western Digital Corporation or its affiliates, registered in the U.S. and other countries. Lightning Ultra, CloudSpeed Ultra and Fusion ioMemory are trademarks of Western Digital Corporation or its affiliates. Other brand names mentioned herein are for identification purposes only and may be the trademark(s) of their respective holder(s).

Thanks!

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