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Disk Cost Busters

“How to Leverage Low Cost Disk Solutions”

Ron Lovell, Practice Director, StorageGreenwich Technology Partners

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Agenda

Challenges

Technology Overview

Vendor Round-up

Conclusions

Audience Response

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Challenges

The cost of SAN remains high compared

to DAS

As the majority of data still resides on

DAS, the cost differential creates a

barrier to the adoption of shared storage

model for many applications

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Challenges

New regulatory requirements such as

Sarbanes-Oxley

Accelerating growth of fixed content

type data

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Data Lifecycle

0

20

40

60

80

1000 30 60 90 120

150

180

210

240

270

300

330

360

Days Since Creation

Pro

bab

ilit

y o

f A

cces

s%

90 days after creation, the probability that any data will be accessed

drops below 20%.

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Data Distribution OverStorage Infrastructure

40%

50%

10%

0%

20%

40%

60%

High Performance Mid Range Low Cost

Storage Array Type

% o

f S

tore

d D

ata

Business Non-

CriticalBusiness Critical

Mission Critical

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1.000

0.200 0.100 0.0100.2500.050 0.010 0.005-

0.20

0.40

0.60

0.80

1.00

$ C

ost

per

MB

Current

Past

Storage Type

Storage Array Cost Comparison

Current 0.250 0.050 0.010 0.005

Past 1.000 0.200 0.100 0.010

High Performance

Mid Range Low Cost DAS

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Solution

Leverage the benefits of networked

storage

Leverage lower cost storage technology

at price the business can rationalize

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Technology Overview

A Look at New Disk Interface Technologies

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Technology Overview

New, lower cost interface technologies

• Serial Advanced Technology Attachment

(SATA)

• Serial Attached SCSI (SAS)

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Technology Overview

Serial Advanced Technology Attachment (SATA)

• Creates a point-to-point connection between the

Serial ATA host bus adapter and the Serial ATA

device (hard disk drive, etc).

• Where transfer rates top out at 133Mb/sec for

parallel ATA (UltraATA), transfer rates begin at 150

MB/sec for SATA

• The maximum data cable (4 conductor) cable length

is 1 meter

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Technology Overview

SATA • MTBF is 500-600K hours

50 hr/week Duty Cycle

• SATA II is designed support hot-swapping of drives,

enabling feature-rich RAID protected storage

enclosures to be developed

• SATA II Port Selector enhancement released on

8/28/03 allows for two (redundant) paths to a

storage device

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Technology Overview

Serial Attached SCSI (SAS)

• Improvement over parallel SCSI

• Data rate increases from 320MB/sec up to

1200MB/second

• Full duplex, dual ported drives, 2.5 form factor

• Multiples drives addressed from a single

controller port

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Technology Overview

SAS

• Mix SATA and SAS drives on the same

controller

• 10 Meter cable length

• Standard for interface specification completed

in May

• Products expected to begin shipping next year

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SATA/SAS Quick Comparison

Criteria SATA SAS

Data Rates 150-300MB/Sec 300-600MB/Sec

MTBF 500-600K hrs 1.2M hrs

Capacity 250Gb 250Gb

Cable Length 1m 10m

Cost/MB $.01 - $.02 $.05 - $.08 (Est)

Rotational Speed 5.4 or 7.2K RPM 10-15k RPM

Buffer 8MB 64MB

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Technology Overview Summary

Serial Attach technology overcomes the

data bus speed limitations of Parallel

Serial ATA drives are ATA drives with a

serial interface and ~10% higher price

Serial SCSI products won’t be available

until 2004

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Technology Overview Summary

Leverages large format, low cost drives

OS compatible

4096 devices addressable with

expanders

SATA drives interoperate with SAS

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Vendor Roundup

What’s Happening Out There

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Vendor Roundup

EMC

• Clariion supports Parallel ATA

• Centera (Content Addressable Storage) uses ATA

HP

• SATA drive support available

• SAS is in progress

• HP, Adaptec, and Seagate working on a combined SAS/SATA solution

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Vendor Roundup

IBM

• 80 and 160Gb SATA Drives

• SATA interfaces on system boards

HDS

• No current array support

• No current plans to integrate SATA into existing array products

• Plans to integrate SAS as demand ramps

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Vendor Roundup

XIOTECH

• SATA and SAS on Magnitude 3D Roadmap

Dynamic Network Factory

• SCSI to SATA Raid-capable arrays from .5T to

4T and 512Mb cache max

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Vendor Roundup

Dot Hill

• No current support

• Products possible early next year

• Look for announcements later this Fall

NetApp

• NearStore product line leverages ATA disk

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Vendor Roundup

StorageTek

• BladeStore – 12T to 150T

• Maxtor MaXLine ATA Technology

InoStor (Tanberg Data)

• ValuNAS 9000 supports up 2.25T on SATA with

multiple raid levels

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Vendor Roundup

LSI Logic

• SATA RAID Controller

• Working with HDS on SAS offering

Fujitsu

• Serial ATA drives available

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Vendor Roundup

Maxtor

• SATA drives available

• Demo of SAS with LSI Logic

Seagate

• SATA drives available

• Working with HP and Adaptec on SAS/SATA

solution

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Vendor Roundup Summary

Most vendors have roadmaps for both SATA and SAS but, market demand is still in question

Partnerships are being created to speed product creation

Vendors are creating stand-alone solutions as well as some integration with existing products

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Conclusions

What Does This All Mean?

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How is SATA being used?

Low cost primary storage arrays for

appropriate applications

Backup and recovery acceleration

Content Addressable Storage

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Possible Uses for the Technology

SATA

• Fixed content such as multimedia data

• Virtual tape device (two stage backup)

• Facilitating data migrations

• Supporting applications with low end data

criticality and performance requirements

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Possible Uses for the Technology

SATA

• Supporting applications with large temporary

file requirements

• More cost-effective data replication target in

remote locations

• Floating mirrors in larger storage arrays

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Possible Uses for the Technology

SAS (Future)

• Supporting applications with mid-level data

criticality and performance requirements

• Supporting some lower cost configurations

that traditionally would have called for FC

• Medium-term archiving

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Things To Watch Out For

New-ness and robustness of the

technology

Standards development

Reliability of ATA vs SCSI drives

Solutions where SATA/SAS are

integrated into existing array technology

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Where is the disk market going?

Expanded and increased pressure for

lower cost solutions and comprehensive

management tool support

Serial Attach represents a powerfully

disruptive force

Mid-tier storage prices are getting pretty

low!

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Where is the Disk Market Going?

SATA and SAS will be integrated into

existing vendor solutions and will

generate new products and vendors

Adoption will likely be quicker than FC

If the price points are right, SAS may

completely overshadow SATA

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Audience Response

1. Will SAS eventually replace FC?

2. Will SAS or SATA become dominant?

3. Are you implementing RAID SATA solutions?

4. Is now a good time to buy mid-tier storage?

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