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Emerging Storage Options for Server Blade Architectures. Server Blade Summit 2005. Storage Options for Server Blade Architectures. Today’s blade server landscape Where are we going next? New blade server architectural challenges and their impact in the data center

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Emerging Storage Options for Server Blade Architectures

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Emerging storage options for server blade architectures l.jpg

Emerging Storage Options for Server Blade Architectures

Server Blade Summit

2005


Storage options for server blade architectures l.jpg

Storage Options for Server Blade Architectures

  • Today’s blade server landscape

  • Where are we going next?

  • New blade server architectural challenges and their impact in the data center

  • Blade server storage choices and their key value propositions


Blade server complexity l.jpg

Blade Server Complexity

Back Plane Support

Fibre Channel

Infiniband

Ethernet

SAS

Design Complexity

2 separate backplane fabrics

Multiple “I/O down” ICs per blade

CPU(s)

F

2 drives per blade (mirrored pair)

I

Chipset

E

Memory

S

2 Local Mirrored Discs


Storage connectivity for server blades l.jpg

CPU(s)

F

I

Chipset

E

Memory

S

Storage Connectivity for Server Blades

Back Plane Support

Fibre Channel

Infiniband

Ethernet

SAS

TYPES OF GATEWAY

LAN

SAN

Storage Connect

FC

SCSI

SAS

SATA

Gateways are used for near line storage as well as fabric storage

iSCSI TOE iSCSI

FC FC

NAS

SAS and iSCSI is used for near cabinet storage

DAS

SAS

FC and iSCSI are SAN connect for block level transfers

NAS is used for ease-of-use and access to storage as the file transfer model


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Blade Chassis Storage

“Semi-local” storage shared by a small number of blades

It is not truly “DAS” because it is not exclusively owned by a single server

It is not truly “SAN” because it is not available to all servers on the Fabric

It is a new “intermediate” level in the storage hierarchy

It is a compromise between the need to eliminate per-blade storage, yet maintain adequate performance for the virtual memory and high-use cached objects

Architectural variances exist

Blade Chassis Storage

Back Plane Support

Fibre Channel

Infiniband

Ethernet

SAS

TYPES OF GATEWAY

LAN

SAN

FC

SCSI

SAS

SATA

iSCSI TOE iSCSI

FC FC

NAS

CPU(s)

F

Blade Chassis Storage

I

DAS

SAS

Chipset

E

Memory

S


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Diskless Server Blade Architecture

  • Server blades are diskless, stateless and used as pool of generic assignable “workers”

  • Simple “size” parameters such as compute power (CPU), memory capacity, aggregate I/O bandwidth

  • A Global Resource Manager can assign and select desire boot image, applications or selective links to appropriate data volumes

  • Chassis Storage provides low latency access to storage for the server blades

    • It is a compromise between per-blade drives and SAN-resident drives

    • It is especially critical for per-blade virtual memory (page swap)


Impact on data center architecture l.jpg

RAID

RAID

RAID

Impact on Data Center Architecture

Cluster of

intelligent Gateways

SAN or appliances

Hard storage

assets

Racks of

server blades

server chassis

Blade Chassis

Storage

leaf

switch

leaf

switch

Multi-tier

network

Infrastructure

Storage Management & Storage Virtualization Layer

server chassis

leaf

switch

Other Storage

Elements

tape, routers, etc.

leaf

switch


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SAS is an ideal storage interconnectfor Blade Server Chassis

  • Low latency to disks is critical for many applications (Transactional)

    • Multiple servers running different applications and different OS, will place highly random load demands on disks

    • Transactional performance is critical where multiple servers collectively present diverse load

  • Advantage in Price/Performance

    • Storage amortized over multiple blades provides better cost structure

  • Reliability (MTBF) is critical

    • Multiple servers dependent on the storage for boot and application -therefore reliability is critical

    • Storage disks mechanically will work hard, therefore robustness is critical

  • Ability to mix and match based on storage needs

    • SAS – SAS or SAS – SATA


Sas sata value proposition l.jpg

server chassis

leaf

switch

leaf

switch

SAS/SATA Value Proposition

SAS/SATA Usage Model

High Performance

SAS Drives for Data

SAS/SATA

IC or HBA

High Capacity

SATA Drives for Backup

Reliable SAS Drives

for Mirrored Boot Pair

  • End user ability to match drives to balance storage to the job and trade-off performance, capacity, reliability, and cost

  • Server vendor can create multiple market segments for the server blades

  • I/O Vendor will benefit from having single chip or adapter serving multiple segments of server blade market

  • Server blades for the midrange market will be first to adopt SAS as the replacement to U320


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SAS and SATA DrivesEnterprise vs. Desktop Applications

SATA (ATA)

SAS (SCSI, FC)

Highest performance capability

Lowest cost per gigabyte

Best performance for transactional data

Most cost effective for reference & sequential-type data

Greater scalability

First to volume disk interconnect

Highest reliability and availability

Simplest configuration setup

Greatest device flexibility

Power management


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Desktop vs. Enterprise Drive Parameters

Enterprise Class

Desktop Class

Performance

Variable Sector Size

Indicators

Rotational Vibration

Reliability

Dual Port

Data Integrity

13msec@ 7200

No

None

5-12 radians/sec/sec

600K hours @ 8x5 duty

No

No

5.7msec@ 15K

Yes

LED

>21 radians/sec/sec

1.2M hours @ 24x7 duty

Yes

Yes


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Contact Information

Ken Zarrabi

Strategic Marketing & Business Development

RAID Storage Adapters, LSI Logic

Tel : 408-433-4527

Fax: 408-433-4380

Email: [email protected]


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Biography

Ken Zarrabi joined LSI Logic in 2002 as a senior product marketing manager for the RAID Storage Adapters division.

Mr. Zarrabi has more than 18 years of marketing, engineering and management experience in the high-tech industry. Prior to joining LSI Logic, he created and implemented marketing and business development plans for Adaptec and zDrive. His career experience also includes positions as a director of customer and product engineering at Fujitsu and six years as manager of customer engineering and program management at Quantum.

Mr. Zarrabi earned a bachelor's degree in mechanical engineering with a minor in computer science from the University of Colorado.


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