© 2009 ibm corporation ibm systems ibm system storage ds3950 express disk system customer overview

© 2009 IBM Corporation IBM Systems

IBM System StorageDS3950 Express Disk System

Customer Overview

© 2009 IBM Corporation

IBM System Storage™

DS3950 Express Specification Overview

• Two models:• 94H: four 8 Gbps FC interfaces• 98H: four 8 Gbps FC and four 1 Gbps iSCSI

• 2 GB (94H) or 4 GB (98H) of cache• Mirrored, battery-backed, destaged to flash

• FC/SATA drives• FC: 146.8 GB, 300 GB, 450 GB (15K)

• SATA: 750 GB, 1,000 GB (7.2K)

• Four 4 Gbps FC drive interfaces support up to six EXP395 expansion units • Max of 112 drives



DS3950 Express Specification Overview

• Client version: 10.60• Firmware: 7.60

• Premium features supported:• Partitioning – 2 (Std.), 4, 8, 16, 32, 64, 128• FlashCopy – 4, 8 (per base)• VolumeCopy• Enhanced Remote Mirroring – 32, 64



DS3950 Express Disk System – Components

• DS3950 Express controller enclosure• Dual-active controllers• Host/SAN connections• Expansion drive loops• Ethernet connections• Battery • Hot-swappable CRUs• 16 FC/SATA drives

• EXP395 drive expansion unit• 4 Gbps ESMs• 16 FC/SATA drives • Switched architecture• Hot-swappable CRUs



DS3950 Express Disk System

Back View

Front ViewPower / Cooling

Drives

Controllers



DS3950 Express – Rear View

1

1

2

2

1

2

Controllers

Power / cooling



DS3950 Express Controller Comparisons

Two FC host ports

Two FC host ports, and

Two iSCSI host ports



DS3950 Express Controller

Host interfaces

Serial connection

Dual Ethernet connections

Cache battery

Drive ports

Model 98H shown



Host-side Connectivity

• Four 8 Gb/s FC ports for host or SAN connections

• Auto-negotiates 2, 4, 8 link speeds

• Model 98H adds four 1 Gbps iSCSI ports

• I/O paths to each controller should be established for full redundancy and failover protection

DS3950 Model 94H

DS3950 Model 98H



DS3950 Express Drive Ports

• Four 4 Gbps drive loops support up to 112 drives

• Each drive port is capable of delivering up to 400 MB/s

Model 98H shown



Back-end Designed For Availability / Low Latency

• When attaching enclosures, drive loops are configured as redundant pairs utilizing one port from each controller. This helps ensure data access in the event of a path/loop or controller failure

• Top-down, bottom-up cabling ensures drives stay online

• Short, quick drive loops reduce latency and create more responsive applications

Model 98H shown



EXP395 Expansion Unit

• 16 drives in 3U enclosure

• 4 Gbps FC interfaces / ESMs• High-speed, low-latency interconnect

from controllers to drives

• Supports intermixing FC and SATA drives• More efficient use of enclosures

• Unique speed-matching technology• 3 Gbps SATA II drives effectively run at 4 Gbps speeds

• Switched architecture• Drive isolation, better diagnostics• Higher performance, lower latency



Enclosure-based Storage Tiers

• Drive carrier designed to eliminate rotational vibration issues

• Supports intermixing FC and SATA drives in single enclosure

• Maintains 4 Gbps FC drive loop

• Allows optimal configurations• Maximize backend channels• Fully utilize purchased enclosures• Increase system availability

SATAFC SATAFC SATAFC SATAFC SATASATA FCFC

No restrictions or limitations of FC/SATA drive locations within EXP395



14

DS3950 Controller



15

• Core processor with built-in hardware-assist for RAID • Performs both XOR (5) and P+Q (6)• 1.2 Ghz

• 2 GBps PCI-Express X8 busses between processor and external interfaces• 2 GBps of internal bandwidth

per controller

DS3950 Controller Technology Processors And Busses



16

• Two 8 Gbps FC host ports• Models 94H and 98H

• Two optional 1 Gbps iSCSI host ports• Model 98H

• Quad-ported 8 Gbps FC chip• Two ports for host-side• Two ports for drive-side• PCIe x8 connection to processor

• 4 Gbps FC “loop switch” chips connect controllers to drives• Each switch chip has a dedicated

connection to the alternate controller• Two external drive ports for expansion

DS3950 Controller Technology Host And Drive Interfaces



17

• 2 or 4 GB of data cache / memory• Dynamic read/write allocations• Dedicated 4 GBps buss to processor• De-staged to flash after power loss

• Battery power used to copy data from cache to the internal flash drives

• Eliminates loss of cache due to long-term loss of power

• Small amount (~250 MB) partitioned for processor memory

• Dual 1Gbit Ethernet management port• Each connection has its • own RJ-45 connection• Connections support IPv6

as well as IPv4 addresses

DS3950 Controller Technology Cache and Management



DS3950 Drive Channels

• Fully redundant pathing from host to drive

• Each controller can access all drive ports

• Each drive chip can access every drive



DS3950 Express / DS4700 Comparison

Dual-controller system (unless noted) D S 4 7 0 0 D S 3 9 5 0

Host interfaces optionsFour 4 Gbps FC; or

Eight 4 Gbps FCFour 8 Gbps FC (94H); or

Four 8 Gbps FC & four 1 Gbps iSCSI (98H)

Redundant drive channels Four 4 Gbps Four 4 Gbps

Max drives 112 FC/SATA 112 FC/FDE/SATA

RAID Processor Intel xScale 667MHz 80% Intel xScale 1.2 GHx

Bus Technology PCI-X (1Gbps) PCI-Express x8 (4 Gbps)

Internal controller bandwidth

2 GBps100%

4 GBps

Cache memory (min/max) 2 GB / 4 GB 2 GB (94H) / 4 GB (98H)

Cache IOPS 120,000 IOPS 67% 200,000 IOPS

Disk Read IOPS 40,000 IOPS 25% 50,000 IOPS

Disk Read MB/s 980 MB/s 60% 1,600 MB/s



DS3950 Express / DS5020 Express – Comparison

3950 Model 98H 3950 Model 94H 5020

Host interfaces

options

Four 8 Gbps FC & four 1 Gbps iSCSI

Four 8 Gb/s FCFour 8Gbps FC; or

Eight 8 Gbps FC; orFour FC and four 1 Gbps iSCSI

Drive channels Four 4 Gb/s Four 4 Gb/s Four 4 Gb/s

Max drives 112 FC/SATA 112 FC/SATA 112 FC/FDE/SATA

RAID Engine Integrated XOR / P+Q Integrated XOR / P+Q Integrated XOR / P+Q

Cache memory 4 GB 2 GB 2 or 4 GB

Premium Features

• Partitions (2 std. Up to 128)• FlashCopy (8)• VolumeCopy • Remote Mirroring (64)

• Partitions (2 std. Up to 128)• FlashCopy (8)• VolumeCopy • Remote Mirroring (64)

• Partitions (Up to 128)• FlashCopy (8)• VolumeCopy • Remote Mirroring (64) • Encryption



DS5000 Performance

DS4700 DS3950 DS5100 base performance

DS5300 enhanced performance

Burst I/O rate cache reads

120,000 IOPS 200,000 IOPS 650,000 IOPS 700,000 IOPS

Sustained I/O rate disk reads

39,250 IOPS 50,000 IOPS 76,000 IOPS 170,000 IOPS

Sustained I/O rate disk writes

9,350 IOPS 9,500IOPS 20,000 IOPS 38,000 IOPS

Drives 112 112 256 448

Burst throughput cache read

1,550MB/s 3,700 MB/s 1,600MB/s 6,400 MB/s

Sustained throughput disk read

980MB/s 1,600 MB/s 1,600MB/s 6,400 MB/s

Sustained throughput disk write

850 MB/s 1,400 MB/s 1,300 MB/s 5,300 MB/s

Host ports 4 4 8 16



256

DS530062,243 SPC-1 IOPS@ 256 drives (~ 14ms)

DS4800

45,015 SPC-1 IOPS @ 224 drives (~ 15 ms)

DS3950 Express


DS4700


SPC-1 IOPS Performance

80

40K

20K

60K

Response time at 100% workload. Max allowed is 30 ms.

Drives

IOP

S

50% performance gain20% more IOPS per drive

60% response time decrease

DS3950DS3950vs. DS4700vs. DS4700

* Based on DS5020 results



DS53005,631 SPC-2 MB/s@ 128 drives

DS4800

1,381 SPC-2 MB/s @ 60 drives

DS3950 Express

1,247 SPC-2 MB/s @ 30 drives

DS4700

823 SPC-2 MB/s @ 30 drives

SPC-2 MB/s Performance

6030

2K

5K

128Drives

MB

/s

50% throughput increaseDS3950DS3950vs. DS4700vs. DS4700

* Based on DS5020 results



DS Storage Manager Software

• Feature-rich management software enables high performance, maximum utilization and uninterrupted data availability



• Intuitive and powerful• Robust functionality with easy-to-understand GUI and wizards• Unparalleled configuration flexibility enables superior

utilization• Tune any attribute to meet any server / application need

• Data is always available / protected• Online configuration, reconfiguration, expansion, maintenance• Automated I/O path failover, drive rebuild, cache destage• Integrated disk encryption, RAID 6, proactive drive monitoring

• Fully-integrated advanced functionality (premium features)• Partitioning, FlashCopy, Volume Copy,

Enhanced Remote Mirroring

DS Storage Manager Software



Intuitive GUI For Simplified Daily Administration

• Ease of use features • Right-click menus and fly-over help• Online help | documentation• One-step configuration capture • Script engine for batch operations• Automatic and manual device discovery• User-named disk systems

and logical drives • Task-oriented starting point for

carrying out common storage management operations



Anytime Administration – Anytime Data

Helps ensure data is always available

• EXP HotAdd Technology• Online capacity expansion, configuration and LUN access

• Dynamic Array Expansion (DAE)• Add drives to existing array (restripes logical drives, defrags array)

• Dynamic Volume Expansion (DVE)• Add available capacity to existing logical drives (OS dependent)

• Dynamic RAID Level Migration (DRM)• Change the RAID configuration of an array (without relocating data )

• Dynamic Segment Size Migration (DSS)• Change the data stripe size (without relocating data )

• Dynamic mode switching• Change between remote mirroring modes



Configuration Flexibility

• Tune any attribute to meet any application need

• Single storage system supports:• Multiple RAID levels

0, 1, 1+0, 3, 5, 6• Multiple drive types, capacities

and rotational speeds• Multiple and various RAID array sizes

• RAID 1 and 10 – 1+1 up to 56+56• RAID 3, 5 and 6 – 2+1 up to 29+1

• One or more logical drives per RAID array• Settings defined on a logical drive basis

• Concurrently maximize performance, capacity and availability• Dynamic configuration / re-configuration



DACstore Technology

• Configuration data is stored on every configured drive. • Each drive knows its state and status as

well as its logical drives’ state and status• One drive in each RAID array stores the

controller- and subsystem-level information• Minimum of three per disk system

• DACstore benefits:• Creates “data intact” drive portability as drives

are not bound to a given enclosure or slot• Individual physical drives can be relocated within a system

to improve channel utilization (performance / availability)• Individual RAID arrays can be migrated to another system• Full systems can be upgraded by simply replacing the controllers

• Higher availability• Critical configuration data stored on every drive, not just a few

USABLE STORAGE



RAID 6

• Uses two independent forms of check data (n+2) to protect against two distinct failure scenarios:• The failure of any two member drives• Media error during reconstruction

• Hardware-assisted P+Q implementationenables superior performance• Single-stripe write that employs two parity

values (“p” and “q”) within each data stripe • Efficient implementation delivers greater performance

(compared to DP)

• Additional features• Enabled on a per-array basis• Dynamic RAID level migration available

• Combined with PDHM offers unparalleled drive and data protection



• Creates multiple virtual systems from a single disk system• Max 128 partitions

• Heterogeneous host support enables consolidation in multi-platform environments

• Storage-based implementation ensures data integrity

• Logical partitioning provides flexibility

Storage PartitioningHost

A Host

B SVC

Group C

LD2

LD2

StoragePartition

A

StoragePartition

B

StoragePartition

C

Unmapped Volumes



Storage Partitioning Benefits

• More efficient storage utilization• No need for extra capacity on each server -- available capacity

can be easily allocated to servers as needed

• More efficient storage management• Administrators spend less time and money managing storage --

fewer storage systems needed to support many servers

• Improved storage flexibility• Servers and storage are de-coupled -- easily add storage, new

servers or retire older servers without storage unload/reload or downtime

• Reduced storage TCO• Amortize the cost of high performing, highly available storage over

multiple servers or clusters -- including servers where not previously economically feasible



FlashCopy

• A point-in-time (PiT) image of a logical drive • Logical equivalent of a physical copy

• Features:• Provides an instantaneous copy• Requires less disk space than a full copy• Mappable to any host • Can be read from, or written to

• Primary uses:• PiT backup image• File / volume restoration source• Data mining / analysis

Base

FlashCopy Repository

FlashCopy Image

X B C A B C

Z

A C

Physical Logical



VolumeCopy

• Complete point-in-time replication of one logical drive (FlashCopy image) to another within a disk system• Target also referred to as a clone

• Primary uses:• Full PiT data set available for analysis, mining, or testing

• Doesn’t degrade performance of production logical drive

• Redistribute data for performance and/or capacity optimization• Technology migration to

new / faster / larger drives• Move logical drives to more

desirable RAID arrays

Production Server Analysis Server

PiTCloneFlashCopy

SourceVolumeCopy



• Storage-based data replication• Designed to provide ongoing, real-time replication of a

logical drive from one storage subsystem to another

• Three mirroring modes• Metro Mirror • Global Copy • Global Mirror

• Primary uses:• Disaster recovery• Centralize backup data• Centralize data mining / analysis

• Up to 64 mirror pairs

Enhanced Remote Mirroring

Cross mirroring

VolumeA

MirrorB

MirrorA

Volume B



Enhanced Remote Mirroring – Key Features

Designed to provide:

• Synchronous, asynchronous and WOC mirroring modes • Helps enables administrators to choose the replication method that

best meets protection, distance or performance requirements

• Dynamic mode switching without suspending the mirror• Helps enables administrators to accommodate changing

application and bandwidth requirements without sacrificing protection

• Suspend / resume mirroring with delta resynchronization • Helps reduce vulnerability associated with reestablishing the mirror

• Read-only mirror access (includes FlashCopy creation)• Helps enable the remote data to be utilized prior to a disaster

without sacrificing protection of the primary site data



QUESTIONS

?



Legal Information and Trademarks

The following terms are trademarks of International Business Machines Corporation in the United States, other countries, or both:IBM, IBM Logo, on demand business logo, TotalStorage, Enterprise Storage Server, xSeries, BladeCenter, eServer, ServeRAID and FlashCopy.

The following are trademarks or registered trademarks of other companies.Intel is a trademark of the Intel Corporation in the United States and other countries.

Java and all Java-related trademarks and logos are trademarks or registered trademarks of Sun Microsystems, Inc., in the United States and other countries.Lotus, Notes, and Domino are trademarks or registered trademarks of Lotus Development Corporation.

Linux is a registered trademark of Linus Torvalds.Microsoft, Windows and Windows NT are registered trademarks of Microsoft Corporation.

SET and Secure Electronic Transaction are trademarks owned by SET Secure Electronic Transaction LLC.UNIX is a registered trademark of The Open Group in the United States and other countries.

* All other products may be trademarks or registered trademarks of their respective companies.

Notes:Performance is in Internal Throughput Rate (ITR) ratio based on measurements and projections using standard IBM benchmarks in a controlled environment. The actual throughput that any user will experience will vary depending upon considerations such as the amount of multiprogramming in the user's job stream, the I/O

configuration, the storage configuration, and the workload processed. Therefore, no assurance can be given that an individual user will achieve throughput improvements equivalent to the performance ratios stated here.

IBM hardware products are manufactured from new parts, or new and serviceable used parts. Regardless, our warranty terms apply.

All customer examples cited or described in this presentation are presented as illustrations of the manner in which some customers have used IBM products and the results they may have achieved. Actual environmental costs and performance characteristics will vary depending on individual customer configurations and

conditions.

This publication was produced in the United States. IBM may not offer the products, services or features discussed in this document in other countries, and the information may be subject to change without notice. Consult your local IBM business contact for information on the product or services available in your area.

All statements regarding IBM's future direction and intent are subject to change or withdrawal without notice, and represent goals and objectives only.

Information about non-IBM products is obtained from the manufacturers of those products or their published announcements. IBM has not tested those products and cannot confirm the performance, compatibility, or any other claims related to non-IBM products. Questions on the capabilities of non-IBM products should be

addressed to the suppliers of those products.

Prices subject to change without notice. Contact your IBM representative or Business Partner for the most current pricing in your geography.

This presentation and the claims outlined in it were reviewed for compliance with US law. Adaptations of these claims for use in other geographies must be reviewed by the local country counsel for compliance with local laws.



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Copyright © 2009 by International Business Machines Corporation. All rights reserved.

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