Specifications

Chapter 2 Hardware Installation and Configuration 2-5
If two disk trays have the same tray ID, the system reports a 98/01 ASC/ASCQ error
code during boot up time. In the 1x2 configuration since two drive channels from a
controller share one disk tray, it is unavoidable to have a tray ID conflict. During
boot up time, the 98/01 ASC/ASCQ error code is reported but has no impact on
system performance.
In a Fibre Channel dual controller connection through two hubs, each hub should be
connected to one “A” controller and one “B” controller to avoid SCSI ID conflicts
(see Section 2.2.4 in the Sun StorEdge A3500/A3500FC Hardware Configuration Guide).
Also, see Section 2.3 “Setting the Loop ID” in the Sun StorEdge A3500/A3500FC
Hardware Configuration Guide for procedures to set the loop ID for A3500FC
controllers. This section also contains a detailed SCSI ID/loop ID reference chart.
For better redundancy, do not connect both controllers of the same controller module
to the same I/O board.
It is recommended that you set both controllers to active/active mode and to balance
the LUNs across both controllers for better performance. The maximum number of
supported LUNs is the total number of LUNs between the two controllers. For
example, if the maximum supported number of LUNs is 16 then you can have 8
LUNs on controller A and 8 LUNs on controller B. If one controller becomes off-line
then the surviving controller owns all 16 LUNs.
2.1.7 World Wide Name (WWN)
Each FC-AL device requires a unique World Wide Name (WWN) that identifies the
device or controller on the loop. There is no hardware setting for the WWN. The
WWN is a 16-byte hexadecimal value that can be retrieved as the logical unit WWN
in the device identifier inquiry page (0x83) and is generated as follows:
■ The name (derived from the controller MAC address) of the storage array
controller creating the volume in the upper 8-bytes.
■ An auto increasing number and time stamp in the lower 8-bytes.
Note – When a controller is hot swapped, the upper 8-bytes of the WWN may not
match a controller in the storage array.