FW V06.XX/HAFM SW V08.02.00 HP StorageWorks SAN High Availability Planning Guide (AA-RS2DD-TE, July 2004)
Table Of Contents
- SAN HA Planning Guide
- Contents
- About this Guide
- Introduction to HP Fibre Channel Products
- Product Management
- Planning Considerations for Fibre Channel Topologies
- Fibre Channel Topologies
- Planning for Point-to-Point Connectivity
- Characteristics of Arbitrated Loop Operation
- Planning for Private Arbitrated Loop Connectivity
- Planning for Fabric-Attached Loop Connectivity
- Planning for Multi-Switch Fabric Support
- Fabric Topologies
- Planning a Fibre Channel Fabric Topology
- Fabric Topology Design Considerations
- FICON Cascading
- Physical Planning Considerations
- Port Connectivity and Fiber-Optic Cabling
- HAFM Appliance, LAN, and Remote Access Support
- Inband Management Access (Optional)
- Security Provisions
- Optional Features
- Configuration Planning Tasks
- Task 1: Prepare a Site Plan
- Task 2: Plan Fibre Channel Cable Routing
- Task 3: Consider Interoperability with Fabric Elements and End Devices
- Task 4: Plan Console Management Support
- Task 5: Plan Ethernet Access
- Task 6: Plan Network Addresses
- Task 7: Plan SNMP Support (Optional)
- Task 8: Plan E-Mail Notification (Optional)
- Task 9: Establish Product and HAFM Appliance Security Measures
- Task 10: Plan Phone Connections
- Task 11: Diagram the Planned Configuration
- Task 12: Assign Port Names and Nicknames
- Task 13: Complete the Planning Worksheet
- Task 14: Plan AC Power
- Task 15: Plan a Multi-Switch Fabric (Optional)
- Task 16: Plan Zone Sets for Multiple Products (Optional)
- Index
Planning Considerations for Fibre Channel Topologies
83SAN High Availability Planning Guide
— Distance limitations can be increased by using multiple fabric elements.
Each director or switch retransmits received signals, thus performing a
repeater and multiplexer function. Distance limitations can also be
increased by using a variety of local area network (LAN), metropolitan
area network (MAN), or wide area network (WAN) extension
technologies.
Note: Variables such as the number of connections, grade of fiber-optic cable, device
restrictions, application restrictions, buffer-to-buffer credit limits, and performance
requirements can affect distance requirements.
■ Bandwidth — ISL connections can be used to increase the total bandwidth
available for data transfer between two directors or switches in a fabric.
Increasing the number of ISLs between elements increases the corresponding
total ISL bandwidth but decreases the number of port connections available to
devices. Table 2 illustrates ISL transfer rate versus port availability for a
fabric consisting of two Director 2/64s.
■ Load balancing — Planning consideration must be given to the amount of
data traffic expected through the fabric or through a fabric element. Because
the fabric automatically determines and uses the least cost (shortest) data
transfer path between source and destination ports, some ISL connections
may provide insufficient bandwidth while the bandwidth of other connections
is unused. To optimize bandwidth use and automatically provide dynamic
load balancing across multiple ISLs, consider purchasing and enabling the
Table 2: ISL Transfer Rate Versus Fabric Port Availability (Two-Director Fabric)
Number
of ISLs
ISL Data Transfer
Rate (at 1.0625 Gbps)
ISL Data Transfer Rate
(at 2.125 Gbps)
Available
Fabric Ports
1 1.0625 Gbps 2.1250 Gbps 126
2 2.1250 Gbps 4.2500 Gbps 124
3 3.1875 Gbps 6.3750 Gbps 122
4 4.2500 Gbps 8.5000 Gbps 120
5 5.3125 Gbps 10.6250 Gbps 118
6 6.3750 Gbps 12.7500 Gbps 116
7 7.4375 Gbps 14.8750 Gbps 114
8 8.5000 Gbps 17.0000 Gbps 112