60
Drive Channel
Redundancy for
the CE7900
Controller Tray
and the CE7922
Controller Tray
Each controller has four drive channels, and each drive channel has two ports.
Therefore, each controller has eight drive ports. A controller tray has eight redundant
path pairs that are formed using one drive channel of controller A and one drive
channel of controller B. The following figure shows the redundant pairs in a
controller tray. The following table lists the numbers of the redundant path pairs and
the drive ports of the drive channels from which the redundant path pairs are formed.
NOTE To maintain data access in the event of the failure of a controller, an ESM, or
a drive channel, you must connect a drive tray or multiple drive trays on a loop to both
drive channels on a redundant path pair.
NOTE If you are connecting DE6900 drive trays and you plan to use the drive-side
trunking capability, you must connect each drive tray (or multiple drive trays on a loop)
to both drive channels on each of two redundant path pairs to maintain hardware
redundancy.
Figure 1 Redundant Path Pairs on the CE7900 Controller Tray and the CE7922
Controller Tray
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