EMC CX600 Configuration Guide - Page 9

Storage Area Network (SAN) Configuration Rules, Switch Terminology

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February 3, 2003 EMC CLARiiON Open Systems Configuration Guide Storage Area Network (SAN) Configuration Rules Switch Terminology Arbitrated Loop connection - Equivalent to a QuickLoop connection in a CLARiiON switch environment. Domain - Equivalent to a single switch. DWDM - (Dense Wavelength Division Multiplexing). WDM technology uses multiple lasers and transmits several wavelengths of light simultaneously over a single optical fiber. Dense WDM adds significantly more channels. Fabric - One or more switches connected by E-Ports. GBIC - (GigaBit Interface Converter). The GBIC converts serial electrical signals to serial optical signals and vice versa. Hops - Number of ISLs a frame needs to traverse between the communicating server and storage system. ISL - (Inter Switch Link). A link that connects two E_Ports on two different switches. Path - A path is a connection between an initiator (such as an HBA port) and a target (such as an SP port in a storage system). Each HBA port that is zoned to a port on an SP is one path to that SP and the storage system containing that SP. Depending on the type of storage system and the connections between its SPs and the switch fabric, an HBA port can be zoned through different switch ports to the same SP port or to different SP ports, resulting in multiple paths between the HBA port and an SP and/or the storage system. Note that the failover software running on the server may limit the number of paths supported from the server to a single storage-system SP and from a server to the storage system. Refer to the Path Rules (page 11). Quad - (DS-xxB series switches only) Ports 0-3, 4-7, 8-11, 12-15 where applicable. SFP - Small Form factor Plugable transceiver. Single-initiator Zoning - Each HBA port has a separate zone that contains it and the SP ports with which it communicates. Trunking - Logically merging up to four ISLs into a single link, which enables dynamic load balancing. Number of Servers and Storage Systems As many as the available switch ports, provided each server follows the fan-out rule below and each storage system follows the fan-in rule below, using WWPN switch zoning. Switches 8-port, 16-port, 32-port departmental switches; 32-port and 64 port director-class switches. For more information, see the Switch Topology Rules (page 20). Fibre Connectivity Fibre Channel Switched Fabric (FC-SW) connection to all server types, subject to the restrictions in the CLARiiON sections of the EMC Support Matrix; Arbitrated Loop Emulation mode (QuickLoop) for connection to FC-AL HP-UX servers. Fan-In Rule A server can be zoned to a maximum of 4 storage systems. Fan-Out Rule An initiator is any of the following devices that have access to an SP: - HBA port in a server - Remote mirror port in another storage system. Note that some HBAs have multiple ports. Each HBA port that is zoned to an SP port is one path to that SP and the storage system containing that SP. Depending on the type of storage system and the connections between its SPs and the switch fabric, an HBA port can be zoned through different switch ports to the same SP port or to different SP ports, resulting in multiple paths between the HBA port and an SP and/or the storage system. Note that the failover software running on the server may limit the number of paths supported from the server to a single storage-system SP and from a server to the storage system. Refer to the Path Rules (page 11). Document Rev 19 Page 9 EMC Confidential

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February 3, 2003
EMC CLARiiON Open Systems Configuration Guide
Document Rev
19
Page 9
EMC Confidential
Storage Area Network (SAN) Configuration Rules
Switch Terminology
Arbitrated Loop connection
- Equivalent to a QuickLoop connection in a CLARiiON switch environment.
Domain
- Equivalent to a single switch.
DWDM
- (Dense Wavelength Division Multiplexing). WDM technology uses multiple lasers and transmits
several wavelengths of light simultaneously over a single optical fiber. Dense WDM adds significantly more
channels.
Fabric
- One or more switches connected by E-Ports.
GBIC
- (GigaBit Interface Converter). The GBIC converts serial electrical signals to serial optical signals and vice
versa.
Hops
- Number of ISLs a frame needs to traverse between the communicating server and storage system.
ISL
- (Inter Switch Link). A link that connects two E_Ports on two different switches.
Path -
A path is a connection between an initiator (such as an HBA port) and a target (such as an SP port in a
storage system). Each HBA port that is zoned to a port on an SP is one path to that SP and the storage system
containing that SP. Depending on the type of storage system and the connections between its SPs and the switch
fabric, an HBA port can be zoned through different switch ports to the same SP port or to different SP ports,
resulting in multiple paths between the HBA port and an SP and/or the storage system. Note that the failover
software running on the server may limit the number of paths supported from the server to a single
storage-system SP and from a server to the storage system. Refer to the
Path Rules
(page 11).
Quad
- (DS-xxB series switches only) Ports 0-3, 4-7, 8-11, 12-15 where applicable.
SFP
- Small Form factor Plugable transceiver.
Single-initiator Zoning
- Each HBA port has a separate zone that contains it and the SP ports with which it
communicates.
Trunking
- Logically merging up to four ISLs into a single link, which enables dynamic load balancing.
Number of Servers and Storage Systems
As many as the available switch ports, provided each server follows the fan-out rule below and each storage
system follows the
fan-in rule
below, using WWPN switch zoning.
Switches
8-port, 16-port, 32-port departmental switches; 32-port and 64 port director-class switches. For more information,
see the Switch Topology Rules (page 20).
Fibre Connectivity
Fibre Channel Switched Fabric (FC-SW) connection to all server types, subject to the restrictions in the CLARiiON
sections of the
EMC Support Matrix
; Arbitrated Loop Emulation mode (QuickLoop) for connection to FC-AL
HP-UX servers.
Fan-In Rule
A server can be zoned to a maximum of 4 storage systems.
Fan-Out Rule
An initiator is any of the following devices that have access to an SP:
-
HBA port in a server
-
Remote mirror port in another storage system.
Note that some HBAs have multiple ports. Each HBA port that is zoned to an SP port is one path to that SP and the
storage system containing that SP. Depending on the type of storage system and the connections between its SPs
and the switch fabric, an HBA port can be zoned through different switch ports to the same SP port or to different
SP ports, resulting in multiple paths between the HBA port and an SP and/or the storage system. Note that the
failover software running on the server may limit the number of paths supported from the server to a single
storage-system SP and from a server to the storage system. Refer to the
Path Rules
(page 11).