Switched Storage Architecture Benefits Computer Measurements Group November 14 th, 2002 Yves Coderre

Switched Storage Architecture Benefits

Computer Measurements Group

November 14th, 2002

Yves Coderre

Evolution of Technology

Disk Technology

Disk Technology

RAID Technology

1990 5.25” 1GB 3600 RPM1992 5.25” 3-9GB 5400 RPM

1996 Various 18-36GB7200 RPM

1998 Various 72GB 10K RPM2000 Various 180GB 15K RPM

IOPS Measurements

Rotational SpeedSeek and Latency

Linear and Spatial densityRAID ProtectionRead/Write ratioCache Hits

Theoretical Calculation

Theoretical IOPS of a SpindleIOPS = 1000/(Average Seek + Latency)

Average Seek = (Ws + Rs)/2Latency (ms) = (1000/RPS)/2 • Computes to 2.99ms for 10,025 RPM Drives• Computes to 2.00ms for 15,00 RPM Drives

Ex: 1000/(5.7ms + 2.99) = 115 IOPS

Practical Calculation

Accounting for R/W Ratio & Read Hits

IOPS = 1000/[(Rs+L)*Rm*Read% + (Ws+L)*Write%]

Taking into account the # of Spindles/Raid Group, theRaid Penalty and type of workload, one can easilyCalculate the #of Spindles required to process a givenNumber of IOPS for a given workload type.

Sample Calculation

10,000 IOPS, 3/1 R/W Ratio @ 70% Read Hits,

100% Spindle Busy

10K RPM Drives (Rd Seek 5.2ms, Wr Seek 6.0ms)RAID 5 (3+1): 16 Array Groups (64 Drives)

RAID 1 (2+2): 13 Array Groups (52 Drives)

Sample Calculation

10,000 IOPS, 3/1 R/W Ratio @ 70% Read Hits,

100% Spindle Busy





Channel Technology

1990 Block Mux 3-4.5 MB/Sec1993 ESCON 17 MB/Sec

Channel Technology


1996 Fibre Channel 100 MB/Sec1998 Fibre Channel 200 MB/Sec

Channel Technology


1996 Fibre Channel 100 MB/Sec1998 Fibre Channel 200 MB/Sec

2000 FICON 100 MB/Sec2002 FICON 200 MB/Sec

Channel Connectivity

1990 16 BMUX 72 MB/Sec1993 16 ESCON 272 MB/Sec



1995 32 ESCON 544 MB/Sec1996 32 Fibre 3.2 GB/Sec



1995 32 ESCON 544 MB/Sec1996 32 Fibre 3.2 GB/Sec

2000 32 FICON 3.2 GB/Sec2002 64 FICON 6.4 GB/Sec

Disk Subsystems

1990 3880, 3990 with Attached Disk1991 ICDA Technology 4GB-32GB

Disk Subsystems


1993 ICDA 512GB1995 ICDA 1TB

Disk Subsystems


1993 ICDA 512GB1995 ICDA 1TB

1997 RAID Subsystems 5TB2000 RAID Subsystems 75TB

IO Intensity Factors

Disk Technology5 MB to 180 GB Capacity3600 to 15,000 RPM

RAID Technology5.25” to 3.5” to 1” (1GB to 180GB)

IO Intensity Factors

Disk Technology5 MB to 180 GB Capacity3600 to 15,000 RPM

RAID Technology5.25” to 3.5” to 1” (1GB to 180GB)

Channel Bandwidth & Connectivity3.5 MB/Sec to 200MB/Sec, 64 Ports

Disk Subsystems evolution1 GB to 100 TB High Performance Subsystem

Growth Trends

Demand for bandwidth is growing faster than capacity requirements

Shared Bus Architecture

Switch Architecture 2000

“(…) the most innovative technology), which built a SAN rather than a backbone bus into its Storage Sub-Systems to deliver exceptional performance and capacity flexibility.”

Bob Zimmerman , Giga Group

“The company’s new Switch Architecture further demonstrated their commitment to technological innovation and business-enabling solutions, and redefines the industry standard, once again.”

Jack Scott, Evaluator Group, Inc.

Switched Fabric Architecture

3.2GB/s

Control

3.2GB/s

Control

3.2GB/s

Data

3.2GB/s

Data

100 Mhz x 2 Bytes = 200MB/Sec

200MB/Sec x 16 Paths = 3.2GB/Sec

Switch Architecture

64GB 64GB CacheCache

32 Hosts Connections: FC, Escon, FICON, iSCSI, NAS32 Hosts Connections: FC, Escon, FICON, iSCSI, NAS

32 Cache 32 Cache ConnectionsConnections

5 GB/sBandwidth

5 GB/sBandwidth

Shared Memory - HSN1) 4 paths / (CHA/DKA)2) 32 paths / SM(Each side)Frequency : 166MHz

Cache-HSN1) 2 paths / (CHA/DKA)2) 8 paths / (CSW for CHA/DKA)

3) 8 paths / (CSW for Cache)

4) 8 paths / (Cache)

5) 32 paths / DKC(CSW-Cache)

6) 16 paths / Cluster(CSW-Cache)

7) 32 paths / DKC (CHA/DKA-CSW)

8) 16 paths / Cluster (CHA/DKA-CSW) Frequency : 166MHz

Up to 32 FC-AL backend pathsUp to 32 FC-AL backend paths

166 Mhz x 2 Bytes = 332MB/Sec

332MB/S x 32 Paths = 10.6GB/Sec

Data Bandwidth

Control

Paradigm Shift

Tangible Benefits

Reduced Total Cost of Ownership

Enables Massive Consolidation & Centralization• Reduced complexity by simplifying storage networking

environments with fewer switches, connectionsSimplified management

• Simplified and automated tools reduces time spend managing storage: people can be re-deployed for other tasks.

Reduced software licensing and maintenance• Through improved capacity utilization: less capacity then

lower licensing and maintenance– One 6TB versus three 4TB– $700K plus

Improved Environmental Costs• Reduced floor space, power, cooling

Network Management Requires Open Standards-Based Approach

Exchanging APIs leads to a growing web of proprietary interfaces

Storage networks require an object-based Common Information Model (CIM), for management of mixed environments

Web-Based Enterprise Management(WBEM), provides a standard managementinterface for existing Web servers

CIM/WBEM is an industry accepted specification that provides a truly open and adaptive standard for heterogeneous storage management Software vendors write to an open interface

No need for proprietary commitments

Hardware vendors provide a common object- based management interface that still enables them to provide differentiation

IHV1

ISV1 ISV2 ISVn

IHV2 IHVn

CIM

ISV1 ISV2 ISVn

IHV1 IHV2 IHVn

CIM/WBEM

ISV1 ISV2 ISVn

IHV1 IHV2 IHVn

The Importance of a Message Bus

A CIM object enables ISVs to codeto a common interface

However, ISVs still need to communicate with each otherto reduce management complexity

A Simple Object Access Protocol (SOAP) message bus provides a standard interface for communication between ISV products

New Application Framework should be based on a CIM/SOAP management message bus.

CIM/WBEM

ISV1 ISV2 ISVn

IHV1 IHV2 IHVn

CIM/WBEM

ISV1 ISV2 ISVn

IHV1 IHV2 IHVn

Management Message Bus: CIM/SOAP

High Performance, Open Computing

Computer Measurements Group

Thank You

Yves Coderre

Documents

Switched Storage Architecture Benefits Computer Measurements Group November 14 th, 2002 Yves Coderre