SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

Resetting a Disk....................................................................................................................103
Considerations for RESET DISK..........................................................................................103
Resetting One Disk...........................................................................................................103
Resetting a Group of Disks................................................................................................104
Sparing a Defective Sector.....................................................................................................104
Automatic Sector Reallocation...........................................................................................104
Displaying Information About Automatic Sector Reallocation..................................................104
Enabling Automatic Sector Reallocation..............................................................................104
Disabling Automatic Sector Reallocation.............................................................................105
Controlling Whether $ZRD9 Starts Automatically After a System Load.....................................105
Sparing a Sector Manually................................................................................................105
Correcting Doubly Allocated File Extents..................................................................................106
Considerations for the REBUILDDFS attribute........................................................................106
Identifying Doubly Allocated File Extents.............................................................................106
Rebuilding the Disk Free Space Table.................................................................................106
Troubleshooting Doubly Allocated File Extents......................................................................107
Replacing the Bootstrap Program............................................................................................107
Replacing the Disk Bootstrap Program on a Mirrored Volume (NonStop S-Series Servers)...........107
Replacing the Disk Bootstrap Program on a Nonmirrored Volume (NonStop S-Series Servers).....108
Enabling and Disabling File Opens on a Disk..........................................................................109
Preventing File Opens on a Disk........................................................................................109
Allowing File Opens on a Disk..........................................................................................109
Swapping Processors for a Disk..............................................................................................109
PRIMARY DISK Consideration............................................................................................110
Changing the Active Path for a Disk........................................................................................112
Considerations for SWITCH DISK.......................................................................................113
Switching the Active Path for a Disk....................................................................................114
Managing Encrypted Disk Drives............................................................................................116
Displaying Information about Encrypted Disks......................................................................117
Changing the Speed of Encryption Key Rotation...................................................................117
Handling Power Failures........................................................................................................117
Hard Disk Drives (HDDs) and Solid State Drives (SSDs).........................................................117
Storage CLIMs.................................................................................................................117
8 Disk Load Balancing...............................................................................118
Disk Load Balancing Between Fabrics......................................................................................118
Disk Load Balancing Between Processors.................................................................................119
Guidelines for All G-Series RVUs........................................................................................119
Guidelines for G06.11 and Later RVUs................................................................................119
Topology Branch Example for G06.11 and Later RVUs...........................................................120
A Closer Look at Eight Disks..............................................................................................122
Disk Load Balancing on G06.10 and Earlier RVUs.....................................................................123
Understanding SAC Ownership.........................................................................................123
Guidelines for G06.10 and Earlier RVUs.............................................................................123
Topology Branch Example for G06.10 and Earlier RVUs........................................................123
A Closer Look at Eight Disks..............................................................................................124
PRIMARY Command Function in G06.00 Through G06.10....................................................125
PRIMARY Command Function in G05.00 and Earlier............................................................128
Establishing a Disk Load Balance in RVUs Prior to G06.11.....................................................130
Maintaining a Disk Load Balance...........................................................................................133
9 Configuring and Managing Storage Pools for Disks....................................134
Displaying Information About Storage Pools.............................................................................134
Displaying Storage Pool Configuration Information...............................................................134
Displaying Storage Pool Status Information..........................................................................136
Configuring a Storage Pool for Disk Drives...............................................................................137
6 Contents