
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
Terminology
The following table describes the terminology relating to SAN LUN Mapping.
Term | Description |
|
|
Node Name | This is an |
| 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 |
| 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 |
| 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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