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Chapter 3 - Setup and Installation
Operating Mode Configuration and Cabling
In this section we provide an overview for the SES Controller card switches and
Host I/O card switches. Following this overview, you will find the detailed
instructions to setup and cable the specific operating mode topology.
SES Controller Card Switch Setting Overview
A word about Fibre Channel device IDs. Under the FC protocol, device IDs can
be generated in several ways: hard addressing, previous addressing, and
negotiated addressing. RAID controllers prefer hard device addressing which
ensures that the device ID will always be the same. The previous addressing
method allows the system to determine whether or not the device has had a
previous address ID assigned to it and will attempt to use that ID (if it is not
available it will assign a new ID). Negotiated addressing occurs when a hard
address or a previous address does not exist and it will then negotiate the bus for
a new device ID. The disadvantage of negotiated device IDs is that there is a
potential liability of the device ID changing due to reconfiguration and therefore
could cause potential problems for the RAID controller's array drive members.
The SES Controller card has a set of switches which configures the enclosure
base address and assigns a device ID to the drive slots, and sets the drive spin-up
options. The disk drive slot IDs are determined by the first three switches,
labeled AD0, AD1, and AD2. They establish a base enclosure hard address and
assign the drive slots, each with a pre-determined set of IDs.
Switches 4, 5 and 6 are spares, and switches 7 and 8 determine the drive spin-up
options.
The table on the following page displays the available device ID ranges for each
series of switch settings. Following the diagram, is an illustration which depicts
the drive slot layout within the enclosure.
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Operating Mode Configuration and Cabling
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