EMC CX600 Configuration Guide - Page 20

Switch Topology Rules, Switches in Fabric, Inter Switch Links (ISLs)

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February 3, 2003 EMC CLARiiON Open Systems Configuration Guide Switch Topology Rules • General Switch Topology Rules...20 • Common Rules for DS-xxB and DS-xxM Switches 22 • DS-xxM Series Switches...23 • DS-xxB Series Switches ...22 • ED-64M, ED-140M, and ED-1032 Enterprise Directors 24 • Switch Interoperability...24 General Switch Topology Rules For information on switch fabric configurations, also refer to EMC Networked Storage Topology Guide. Switches in Fabric All switches except ED-12000B A fabric can contain only EMC storage, supported non-EMC storage, and EMC supported servers. • A maximum of 16 switches may form a single fabric via E-port, except for a single fabric with multiple HBA-port servers, which has a maximum of 2 switches. In a dual-fabric configuration, the switches in each fabric can differ in quantity. • A maximum of 3 hops may exist between a communicating server and a storage system. ED-12000B switch • Each ED-12000B switch consists of two switches (domains), and a maximum of 2 ED-12000B switches may form a single fabric. • Maximum of 3 hop may exist between a communicating server and a storage system. Note: The ED12000B does not support QuickLoop. Inter Switch Links (ISLs) A maximum of 8 ISLs may exist between two directly communicating switches in a fabric, regardless of the number of switches in the fabric. In a non-remote mirror configuration Minimum of 2 Inter Switch Links (ISLs) between two directly communicating switches are required, regardless of the number of switches in the fabric. In a remote mirror configuration Single ISL can connect a remote and local switch. However, for optimal performance, availability, and support, we strongly recommend a minimum of two ISLs between the switches. For mirroring over IP, an ISL is connected to the IP network through an FC-to-IP device. For supported FC-to-IP devices, refer to the EMC Support Matrix. Maximum ISL lengths - 500 meters using SWL optics (GBICs or SFPs) and 50/125 multi-mode fiber cable at 1Gbps operation. - 300 meters using SWL optics (GBICs or SFPs) and 50/125 multi-mode fiber cable at 2Gbps operation. - 10 kilometers with LWL optics (GBICs or SFPs) and 9/125 single-mode fiber cable at 1Gbps or 2Gbps operation. - 20 kilometers with LWL optics (SFPs) and 9/125 single-mode fiber cable at 1Gbps or 2Gbps operation for the DS-16B2, DS-16M, DS-16M2, DS-32M, DS-32M2, DS-32B2, ED-64M, ED-140M, and ED-12000B switches. Note: Support for distances greater than 10 kilometers is dependent on the quality of the fiber cable between the two data centers. When deploying any length of longwave/singlemode media for mission-critical business environments, EMC advises customers to hire a fiber-cable specialist who can measure the quality of the fiber cable and compare it to expected standards. Adding ISLs to an operational fabric - Causes the fabric to rebuild routing tables, which may interrupt I/O flow. Document Rev 19 Page 20 EMC Confidential

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February 3, 2003
EMC CLARiiON Open Systems Configuration Guide
Document Rev
19
Page 20
EMC Confidential
Switch Topology Rules
•
General Switch Topology Rules
....................................................................................................................
20
•
Common Rules for DS-xxB and DS-xxM Switches
....................................................................................
22
•
DS-xxM Series Switches
.................................................................................................................................
23
•
DS-xxB Series Switches
..................................................................................................................................
22
•
ED-64M, ED-140M, and ED-1032 Enterprise Directors
.............................................................................
24
•
Switch Interoperability
...................................................................................................................................
24
General Switch Topology Rules
For information on switch fabric configurations, also refer to
EMC Networked Storage Topology Guide.
Switches in Fabric
All switches except ED-12000B
A fabric can contain only EMC storage, supported non-EMC storage, and EMC supported servers.
•
A
maximum of 16
switches may form a single fabric via E-port, except for a single fabric with multiple
HBA-port servers, which has a maximum of 2 switches. In a dual-fabric configuration, the switches in each
fabric can differ in quantity.
•
A maximum of 3 hops may exist between a communicating server and a storage system.
ED-12000B switch
•
Each ED-12000B switch consists of two switches (domains), and a maximum of 2 ED-12000B switches may form
a single fabric.
•
Maximum of 3 hop may exist between a communicating server and a storage system.
Note:
The ED12000B does not support QuickLoop.
Inter Switch Links (ISLs)
A maximum of 8 ISLs may exist between two directly communicating switches in a fabric, regardless of the
number of switches in the fabric.
In a non-remote mirror configuration
Minimum of 2 Inter Switch Links (ISLs) between two directly communicating switches are required, regardless of
the number of switches in the fabric.
In a remote mirror configuration
Single ISL can connect a remote and local switch. However, for optimal performance, availability, and support, we
strongly recommend a minimum of two ISLs between the switches. For mirroring over IP, an ISL is connected to
the IP network through an FC-to-IP device. For supported FC-to-IP devices, refer to the E
MC Support Matrix
.
Maximum ISL lengths
- 500 meters using SWL optics (GBICs or SFPs) and 50/125 multi-mode fiber cable at 1Gbps operation.
- 300 meters using SWL optics (GBICs or SFPs) and 50/125 multi-mode fiber cable at 2Gbps operation.
- 10 kilometers with LWL optics (GBICs or SFPs) and 9/125 single-mode fiber cable at 1Gbps or 2Gbps operation.
- 20 kilometers with LWL optics (SFPs) and 9/125 single-mode fiber cable at 1Gbps or 2Gbps operation for the
DS-16B2, DS-16M, DS-16M2, DS-32M, DS-32M2, DS-32B2, ED-64M, ED-140M, and ED-12000B switches.
Note:
Support for distances greater than 10 kilometers is dependent on the quality of the fiber cable between the
two data centers. When deploying any length of longwave/singlemode media for mission-critical business
environments, EMC advises customers to hire a fiber-cable specialist who can measure the quality of the fiber cable
and compare it to expected standards.
Adding ISLs to an operational fabric - Causes the fabric to rebuild routing tables, which may interrupt I/O flow.