nStor NexStor 4200F Series, Руководство пользователя

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Chapter 3 - Setup and Installation
Operating Mode Configuration and Cabling
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Operating Mode Configuration and Cabling
In this section you will find the instructions for setting the SES Controller card
switches. Next you will find illustrated instructions for the setting up and cabling
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 address ID will always be the same. Previous addressing,
when hard addressing is not employed this 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 previous ID, and 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 card has a set of switches which configures the enclosure base address
and assigns drive slots a device ID and sets the drive spin-up options. The disk
drive slot device IDs are determined by the first three switches, labeled AD0,
AD1, and AD2 establishing a base enclosure hard address and assigns the drive
slots a specific series of pre-determined IDs.
Switches 4, 5 and 6 are spares, and switches 7 and 8 set 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.
4200F.book Page 52 Thursday, January 23, 2003 2:47 PM