Chapter 5: SAN LUN Mapping

Overview

When attaching multiple host systems in a SAN environment, it may be necessary to more precisely control which hosts have access to which logical drives. In addition to controlling logical drive availability on a RAID controller on a port-by-port basis, it is also possible to further restrict access to a specific logical drive. Up to 512 SAN LUN mappings are supported.

Terminology

The following table describes the terminology relating to SAN LUN Mapping.

Term

Description

 

 

Node Name

This is an eight-byte hexadecimal number, uniquely identifying

 

a single host system. It incorporates the World Wide Name

 

and two additional bytes which are used to specify the format.

 

 

Port Name

This is an eight-byte hexadecimal number, uniquely identifying

 

a single host port. It incorporates the World Wide Name and

 

two additional bytes which are used to specify the format and

 

indicate the port number.

 

 

Mapping Name

A 32-character name that can be used to help identify the host

 

system.

 

 

Exclusive Access

A logical drive is presented to only one host system. It is not

 

available to any other host systems.

 

 

Read/Write Access

A logical drive will allow both reads and write operations.

 

 

Read Only Access

A logical drive will not allow writes.

 

 

Mapped LUN

This is the LUN number that a specific logical drive responds

Number

to when accessed by a host. It is not necessary for this to bear

 

any relation to the LUN number.

 

 

Mapping Availability

Which controller ports the mapping is valid for.

 

 

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