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Device, Locality, Configuring Zones, drop-down list. If all fabric elements are set

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Planning Considerations for Fibre Channel Topologies Special consideration must also be given to applications with high data transfer rates or devices that participate in frequent or critical data transfer operations. For example, in Figure 35 on page 78, suppose device D7 is a server and device D9 is a storage unit and both devices participate in a critical nightly backup operation. HP recommends that such a connection be routed directly through Director S2 (rather than the entire fabric) through zoned or WWN-bound port connections. For additional information, refer to "Device Locality" on page 100. ■ Zoning - For multi-switch fabrics, zoning is configured on a fabric-wide basis. Changes to the zoning configuration apply to all directors and switches in the fabric. To ensure the zoning configuration is maintained, certain rules are enforced when two or more elements are connected through ISLs to form a fabric, or when two or more fabrics are joined. For additional information, refer to "Configuring Zones" on page 133. After directors and edge switches are defined and cabled, they automatically join to form a single fabric through a user-transparent process. However, the user should be aware of the following fabric concepts, configuration characteristics, and operational characteristics: ■ Principal Switch selection - Setting this value determines the principal switch for the multi-switch fabric. Select either Principal (highest priority), Default, or Never Principal (lowest priority) from the Switch Priority drop-down list. If all fabric elements are set to Principal or Default, the director or switch with the highest priority and the lowest WWN becomes the principal switch. Following are examples of principal switch selection when fabric elements have these settings. - If you have three fabric elements and set all to Default, the director or switch with the lowest WWN becomes the principal switch. - If you have three fabric elements and set two to Principal and one to Default, the element with the Principal setting that has the lowest WWN becomes the principal switch. - If you have three fabric elements and set two to Default and one to Never Principal, the element with the Default setting and the lowest WWN becomes the principal switch. SAN High Availability Planning Guide 83

Section	Page
Contents	3
About this Guide	9
Overview	10
Intended Audience	10
Related Documentation	10
Conventions	11
Document Conventions	11
Table 1: Document Conventions	11
Text Symbols	12
Equipment Symbols	12
Rack Stability	13
Getting Help	14
HP Technical Support	14
HP Storage Website	14
HP Authorized Reseller	14
Introduction to HP Fibre Channel Products	15
Product Overview	15
Figure 1: Rack-mount HP products	17
Directors	18
Director Performance	19
Director 2/64	21
Figure 2: Director 2/64 (front view)	21
Figure 3: Director 2/64 (rear view)	22
Director 2/140	23
Figure 4: Director 2/140 (front view)	23
Figure 5: Director 2/140 (rear view)	24
Edge Switches	25
Edge Switch Performance	25
Edge Switch 2/16	26
Figure 6: Edge Switch 2/16 (front view)	26
Figure 7: Edge Switch 2/16 (rear view)	27
Edge Switch 2/24	28
Figure 8: Edge Switch 2/24 (front view)	28
Figure 9: Edge Switch 2/24 (rear view)	29
Edge Switch 2/32	30
Figure 10: Edge Switch 2/32 (front view)	30
Figure 11: Edge Switch 2/32 (rear view)	31
Product Features	32
Connectivity Features	32
Security Features	33
Serviceability Features	34
Product Management	37
Product Management	38
Figure 12: Out-of-band product management	39
Figure 13: Inband product management	40
HAFM Server Description	41
Figure 14: HAFM Server	41
HAFM Server Specifications	42
Ethernet Hub	43
Figure 15: HP Ethernet hub	43
Remote User Workstations	43
Product Firmware	44
Backup and Restore Features	45
Product Software	47
Management Services Application	47
Graphical User Interface	48
HAFM Application	48
Products View	49
Figure 16: Products View	49
Fabrics View	51
Figure 17: Fabrics View - Topology tab	51
Figure 18: Fabrics View - Zone Set tab	52
Product Manager Application	53
Figure 19: Hardware View	53
Embedded Web Server Interface	54
Figure 20: View Panel (Embedded Web Server interface)	55
Command Line Interface	56
Planning Considerations for Fibre Channel Topologies	57
Fibre Channel Topologies	58
Planning for Point-to-Point Connectivity	59
Characteristics of Arbitrated Loop Operation	60
Shared Mode Versus Switched Mode	60
Figure 21: Shared mode operation	61
Figure 22: Switched mode operation	62
Public Versus Private Devices	62
Figure 23: Public device connectivity	63
Figure 24: Private device connectivity	64
Public Versus Private Loops	65
Figure 25: Public loop connectivity	65
Figure 26: Private loop connectivity	66
Planning for Private Arbitrated Loop Connectivity	66
Shared Mode Operation	67
Figure 27: Shared Mode operation and logical equivalent	67
Figure 28: 20-Device private arbitrated loop	68
Switched Mode Operation	70
Figure 29: Switched mode operation and logical equivalent	70
Figure 30: Switched mode operation with eight independent looplets	71
Planning for Fabric-Attached Loop Connectivity	73
Connecting a SAN to a Switched Fabric	73
Figure 31: Arbitrated loop to switched fabric connectivity	74
Figure 32: ISL bandwidth limitation	75
Server Consolidation	76
Figure 33: Server consolidation	76
Tape Device Consolidation	77
Figure 34: Tape drive consolidation	77
Planning for Multi-Switch Fabric Support	78
Figure 35: Example multi-switch fabric	78
Fabric Topology Limits	79
Factors to Consider When Implementing a Fabric Topology	80
Table 2: ISL Transfer Rate versus Fabric Port Availability (Two-Director Fabric)	82
Fabric Topologies	89
Cascaded Fabric	89
Figure 36: Cascaded fabric	90
Ring Fabric	91
Figure 37: Ring fabric	91
Mesh Fabric	92
Figure 38: Full mesh fabric	92
Core-to-Edge Fabric	94
Figure 39: 2-by-14 Core-to-Edge fabric	94
Figure 40: 4-by-12 Core-to-Edge fabric	95
Fabric Island	96
Planning a Fibre Channel Fabric Topology	97
Fabric Performance	97
I/O Requirements	98
Application I/O Profiles	98
ISL Oversubscription	99
Figure 41: ISL oversubscription	99
Device Locality	100
Figure 42: Device locality	101
Device Fan-Out Ratio	101
Figure 43: Device fan-out ratio	102
Performance Tuning	102
Figure 44: Fabric performance tuning	103
Fabric Availability	104
Redundant Fabrics	105
Figure 45: Redundant fabrics	106
Fabric Scalability	107
Obtaining Professional Services	107
Fabric Topology Design Considerations	107
Large Fabric Design Implications	107
FCP and FICON in a Single Fabric	108
Director or Switch Management	109
Port Numbering Versus Port Addressing	110
Figure 46: Director 2/64 port numbers and logical port addresses	110
Management Limitations	111
Protocol Intermix Recommendations	112
Multiple Data Transmission Speeds in a Single Fabric	114
Physical Planning Considerations	115
Port Connectivity and Fiber-Optic Cabling	116
Port Requirements	116
Optical Transceivers	117
Data Transmission Distance	118
Cost Effectiveness	118
Device or Cable Restrictions	118
Extended-Distance Ports	119
High-Availability Considerations	119
Cables and Connectors	120
Cables	120
Director and Switch Connectors	121
Figure 47: SFP transceiver and LC duplex connector	121
Routing Fiber-Optic Cables	121
HAFM Server, LAN, and Remote Access Support	122
HAFM Server	122
HAFM Server Connectivity	123
Connectivity Planning Considerations	124
Remote User Workstations	124
Figure 48: Typical network configuration (one Ethernet connection)	126
Figure 49: Typical network configuration (two Ethernet connections)	127
SNMP Management Workstations	128
Web Browser Access	128
Inband Management Access (Optional)	129
Security Provisions	131
Password Protection	131
Table 3: Types of User Rights	131
Name Server Zoning	132
Figure 50: Product zoning	132
Benefits of Zoning	133
Configuring Zones	133
Joining Zoned Fabrics	135
Factors to Consider When Implementing Zoning	136
Server and Storage-Level Access Control	136
Obtaining Professional Services	137
Optional Features	138
Inband Management Console Access	139
Open Systems Management Server	139
FICON Management Server	139
Flexport Technology	140
SANtegrity Binding	140
Enterprise Fabric Mode	141
SANtegrity Binding Planning Considerations	142
Open Trunking	142
Figure 51: Open Trunking configuration	142
Configuration Planning Tasks	145
Task 1: Prepare a Site Plan	146
Table 4: Physical Planning and Hardware Installation Tasks	148
Table 5: Operational Setup Tasks	149
Task 2: Plan Fibre Channel Cable Routing	151
Task 3: Consider Interoperability with Fabric Elements and End Devices	152
Task 4: Plan Console Management Support	153
Task 5: Plan Ethernet Access	154
Task 6: Plan Network Addresses	155
Task 7: Plan SNMP Support (Optional)	156
Task 8: Plan E-Mail Notification (Optional)	157
Task 9: Establish Product and HAFM Server Security Measures	157
Task 10: Plan Phone Connections	158
Task 11: Diagram the Planned Configuration	158
Task 12: Assign Port Names and Nicknames	158
Rules for Port Names	159
Rules for Nicknames	159
Task 13: Complete the Planning Worksheet	159
Task 14: Plan AC Power	164
Task 15: Plan a Multi-Switch Fabric (Optional)	165
Task 16: Plan Zone Sets for Multiple Products (Optional)	166
Index	167
A	167
B	167
C	167
D	168
E	168
F	168
G	169
H	169
I	170
J	170
L	170
M	170
N	170
O	171
P	171
R	172
S	172
T	173
U	173
W	173

Match case Limit results 1 per page

Planning Considerations for Fibre Channel Topologies

SAN High Availability Planning Guide

Special consideration must also be given to applications with high data

transfer rates or devices that participate in frequent or critical data transfer

operations. For example, in

Figure 35

on page 78, suppose device

is a

server and device

is a storage unit and both devices participate in a critical

nightly backup operation. HP recommends that such a connection be routed

directly through Director

(rather than the entire fabric) through zoned or

WWN-bound port connections. For additional information, refer to “

Device

Locality

” on page 100.

■

Zoning —

For multi-switch fabrics, zoning is configured on a fabric-wide

basis. Changes to the zoning configuration apply to all directors and switches

in the fabric. To ensure the zoning configuration is maintained, certain rules

are enforced when two or more elements are connected through ISLs to form

a fabric, or when two or more fabrics are joined. For additional information,

refer to “

Configuring Zones

” on page 133.

After directors and edge switches are defined and cabled, they automatically join

to form a single fabric through a user-transparent process. However, the user

should be aware of the following fabric concepts, configuration characteristics,

and operational characteristics:

■

Principal Switch selection —

Setting this value determines the principal

switch for the multi-switch fabric. Select either

Principal

(highest priority),

Default

, or

Never Principal

(lowest priority) from the

Switch Priority

drop-down list. If all fabric elements are set to

Principal

Default

, the

director or switch with the highest priority and the lowest WWN becomes the

principal switch.

Following are examples of principal switch selection when fabric elements

have these settings.

—

If you have three fabric elements and set all to

Default

, the director or

switch with the lowest WWN becomes the principal switch.

—

If you have three fabric elements and set two to

Principal

and one to

Default

, the element with the

Principal

setting that has the lowest WWN

becomes the principal switch.

—

If you have three fabric elements and set two to

Default

and one to

Never

Principal

, the element with the

Default

setting and the lowest WWN

becomes the principal switch.