NetApp FC4600 - Drive Channel Redundancy for the CE6998 Controller Tray

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Drive Channel
Redundancy for
the CE6998
Controller Tray
Each controller has two drive channels, and each drive channel has two ports.
Therefore, each controller has four drive ports. A controller tray has four 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 a string of drive trays to both drive
channels on a redundant path pair.
Figure 2 Redundant Path Pairs on the CE6998 Controller Tray
Table 2 Redundant Path Pairs on the CE6998 Controller Tray
Redundant
Path Pairs
Drive Ports on
Controller A
Drive Channels
on Controller
AController A
Ports on
Controller B
Drive Channels
on Controller B
1 Port 4 Channel 1 Port 1 Channel 3
2 Port 3 Channel 1 Port 2 Channel 3
3 Port 2 ChannelChannel
2
Port 3 Channel 4
4 Port 1 Channel 2 Port 4 Channel 4