HSG80 Enterprise/Modular Storage RAID Array Fibre Channel Solution Software V8.7A for Windows Release Notes (AA-RH0QL-TE, July 2003)

Avoiding Problem Situations

Release Notes – HSG80 Enterprise/Modular Storage RAID Array Fibre Channel Solution

Software Version 8.7A for Windows

Replacing Array Controllers, Cache Modules, or External

Cache Battery Storage Building Blocks

You can replace the array controller, cache module, or external cache battery (ECB)

storage building block (SBB) while the storage system is shut down. However, you

must enter the

SHUTDOWN THIS_CONTROLLER command prior to shutting down the

storage system in order to make configuration changes. If two array controllers are

configured in a dual-redundant configuration, you must first enter the

SHUTDOWN OTHER_CONTROLLER command.

These commands instruct the array controllers to flush all unwritten data from the

cache modules and discontinue all I/O activity. For more information regarding the

SHUTDOWN controller command, see the HSG80 Array Controller ACS Version 8.7 CLI

Reference Guide. For information on maintenance and replacement of the array

controller, cache module, and external cache battery, see the HSG80 Array Controller

ACS Version 8.7 Maintenance and Service Guide.

Disk Resource Pending Timeout for Large Configurations

In order to ensure continuous operation of Disk Resources across SAN perturbations

with Disk Resource counts greater than eight, it is recommended that the Pending

Timeout parameter for each Disk Resource be increased from 180 seconds to 360

seconds.

To view and set the Pending Timeout parameter:

1. Open the Microsoft Cluster Administrator.

2. Select a Disk Group resource in the left pane.

3. Right click each Disk Resource in right pane, one at a time, and select Properties.

4. Select the Advanced tab from the Properties menu.

5. Locate the Pending Timeout value and change it to 360.

6. Click OK.

Unit Offsets

Setting unit offsets requires a host reboot for the newly set offsets to take effect.