StorCase Technology CSI-to-SCSI Single & Dual RAID - Manual (Page 109)

96 Configuration
StorCase Technology, Inc. Dual RAID Module User's Guide - Rev. A03
Host Channel
Setting
Configuration Description
Stand-Alone
Dual Port
Single RAID
Module Unit
Dual RAID
Module Unit
This option allows the controller to operate with two host ports. In
this mode, the same LUNs display on the two separate host ports.
Stand-Alone Dual Port mode allows the host to achieve greater
throughput by balancing I/O operations across the two host ports.
Host port fault tolerance is also achieved, since the host can con-
tinue accessing the controller if one host channel fails.
This option allows both controllers to operate independently and
in an active-active pair. Active-Active modes allow two controllers
to cooperate in system operation in a fault-tolerant manner. If one
controller fails while in Active-Active mode, the other controller
assumes its activities, allowing host access to continue.
When both controllers are online, each controller presents its
LUNs on only one port.
This option allows the use of just one controller, with the second
controller acting only as a backup (in case of a failure of the con-
troller in use).
When changing to this mode on one controller, both controllers
must be rebooted at the same time. Upon reboot, both controllers
will automatically be in Active-Passive Dual Port mode
Active-Active
Single Port
Active-Passive
Dual Port
Dual RAID
Module Unit
IFSII_DR4
Single RAID
Module Unit
Stand-Alone
Single Port
This option allows the controller to operate with one host port and
three or four disk channels. Select Stand-Alone Single Port mode
if you do not want to run in dual port mode, or your host operating
system does not support it.
Table 7: Operating Mode Settings