StorCase Technology FC-to-SCSI Single & Dual RAID - Manual (Page 25)

12 Installation
StorCase Technology, Inc. FC-SCSI Dual RAID Module User's Guide - Rev. A01
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_FDR21
Dual RAID
Module Unit
Active-Active
Dual Port
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 both ports, permitting redundant host access to all LUNs
when there is a failure between host and controller. After failover,
one port of the surviving controller presents Controller A’s LUNs
and other port presents Controller B’s LUNs.
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-Active Dual Port mode
Table 1: Operating Mode Settings
CAUTION: DO NOT bend the LC (optical) cable beyond the cable's minimum bend
radius, data transmission degradation may occur. Follow cable manufac-
turer's guidelines for bend radius limitation.
WARNING: DO NOT look directly into the open end of an active LC (optical) cable or
optical SFP module (with plugs removed)! Serious eye damage can occur
from direct exposure to the infrared light!
NOTES: HSSDC2 (copper) SFP modules support 1Gbps operation only.
LC (optical) SFP modules support both 2Gbps and 1Gbps operation.
When in Active-Active mode, the dual controllers communicate with each other
using SCSI Initiator IDs 6 & 7 on the disk channels. IDs 6 & 7 are factory set to ensure
optimum communication between the two controllers. These IDs cannot be
changed while in Active-Active mode. DO NOT configure any other devices to IDs
6 & 7 on the disk channels, or the Active-Active configuration will fail to operate!
Refer to section "Working with Operating Modes" for further information on Operating Modes.