© 2014 Western Digital Technologies, Inc. All Rights Reserved.

At the Heart of the Digital Economy

Rob RyanWestern Digital Technologist

Deep Storage Innovations for New World Datacenters

Meet BSD

November 2nd 2014

© 2014 Western Digital Technologies, Inc. All Rights Reserved.

At the Heart of the Digital EconomyWe explore the storage device, its ubiquity, and why it’s time to break the mold. Several topics explored that go beyond old school finely tuned block storage machines.

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Deep Storage Innovations for New World Datacenter

© 2014 Western Digital Technologies, Inc. All Rights Reserved.

Progressive Capacity

Capacity and performance are designed with marginThis potential of the product is lost when the product is finalized

Progressive capacity unlocks lost potential for the industry

Provide 100GB increments for higher overall capacity at lower cost

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Deep Storage Innovations for New World Datacenter

6TB5TB 7TB 6TB5TB 7TB

6TB5TB 7TB6TB5TB 7TB

© 2014 Western Digital Technologies, Inc. All Rights Reserved.

Low Spin Speed

Helium adds nice benefit over traditional powerSlower Spindle Speed drops power to half of traditional levelsLatency increased proportional to speed drop

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Deep Storage Innovations for New World Datacenter

Competitor A

Competitor B

Competitor C

Competitor A

Competitor C Helium

WD 4TB Re

WD 6TB Ae

© 2014 Western Digital Technologies, Inc. All Rights Reserved.

Fast Response

Bit Error Rate of one in 1015

reads can take timeIf we quickly respond that this read will take time, the system may recover data elsewhere fasterIf multiple reads are slow, request full recovery of dataWork to do for rules, actions, and health

Deep Storage Innovations for New World Datacenter

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Drive Performance and Reliability vs Error Margin

Log1

0 BE

R

Drive EM level (db)

-4-6

-8

-10

-12

-14-16

-18

-20

-22-24

-260.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

Soft Error Rate

Client Recoveries ON

Enterprise Recoveries ON

© 2014 Western Digital Technologies, Inc. All Rights Reserved.

ZAC and SMR

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Deep Storage Innovations for New World Datacenter

SMR Category DescriptionDrive Managedaka. Transparent, Type 1 SMR

- No host changes- Device manages all media access requests as it does today.- Some command patterns can cause performance degradation. - Backward compatible

Host Aware - Similar to Drive Managed, but…- New commands to inform host of SMR characteristics and manage zones.- Backward compatible

Host Managedaka. Type 2 SMR

- New device type to host (new interface standard, T10(ZBC)/T13(ZAC))- Host needs software stack changes to write sequentially only.- Device may accommodate some small LBA ranges with random writes

(CMR zones)- Predictable Performance- Not backward compatible

© 2014 Western Digital Technologies, Inc. All Rights Reserved.

Cold Storage

Power Zones can save massive amounts of powerWrite is instantly available utilizing an active power zone“Read seldom” allows recovery in hours or minutes

Scheduled power zone or on demand queue options

Move some hot replicas to cold

Erasure code data for archive

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hot hot

cold

Deep Storage Innovations for New World Datacenter

© 2014 Western Digital Technologies, Inc. All Rights Reserved.

Meet BSD - SummaryThink about what “we” can do to improve the EcosystemProgressive CapacityLower PowerFaster data to the userZAC & SMRCold Storage

Deep Storage Innovations for New World Datacenter

Thank you

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