Logical unit settings for the HDS Thunder, Hitachi AMS 200, AMS 500, and AMS 1000, WMS100, and HDS TagmaStore WMS systems

Logical unit (LU) settings apply to individual LUs that are configured in the HDS Thunder, Hitachi AMS 200, AMS 500, and AMS 1000, WMS100, and HDS TagmaStore WMS systems.

You must configure the systems LUs as described in HDS Thunder, Hitachi AMS 200, AMS 500, and AMS 1000, WMS100, and HDS TagmaStore WMS systems LU settings for the system if the logical unit number (LUN) is associated with ports in a switch zone that is accessible to the system.

Table 1. HDS Thunder, Hitachi AMS 200, AMS 500, and AMS 1000, WMS100, and HDS TagmaStore WMS systems LU settings for the system
Option	Required values	Default setting
LUN default controller	Controller 0 or Controller 1	Any

Note: These settings only apply to LUs that are accessible to the system.

Data corruption scenarios to avoid

Scenario 1: The configuration application enables you to change the serial number for an LU. Changing the serial number also changes the unique user identifier (UID) for the LU. Because the serial number is also used to determine the WWPN of the controller ports, two LUNs cannot have the same unique ID on the same SAN because two controllers cannot have the same WWPN on the same SAN.

Scenario 2: The serial number is also used to determine the WWPN of the controller ports. Therefore, two LUNs must not have the same ID on the same SAN because this results in two controllers having the same WWPN on the same SAN. This is not a valid configuration.

Attention: Do not change the serial number for an LU that is managed by the system because this can result in data loss or undetected data corruption.

Scenario 3: The configuration application enables you to create LUN A, delete LUN A, and create LUN B with the same unique ID as LUN A. If the LUN is managed by the system, this scenario can cause data corruption because the system might not recognize that LUN B is different than LUN A.