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

1 Introduction to the Storage Subsystem
The storage subsystem allows you to use SCF to configure and manage storage devices online.
This chapter contains these sections:
• “SCF Interface to the Storage Subsystem” (page 25)
• “Manager Processes” (page 25)
“Storage Subsystem Manager ($ZZSTO)” (page 25)◦
◦ “Storage Management Foundation (SMF)” (page 26)
• “Configuration Overview” (page 27)
“To Make Configuration Changes Safely” (page 27)◦
◦ “Using OBEYFORM to Create an SCF Command File” (page 27)
• “Displaying Information About the Storage Subsystem” (page 27)
◦ “LISTDEV Information for the Storage Subsystem” (page 28)
• “Fault Tolerance” (page 28)
SCF Interface to the Storage Subsystem
The storage subsystem configures and manages all storage objects for G-series and H-series RVUs.
You use SCF to configure, control, and inquire about these objects.
The interfaces between SCF, the Subsystem Control Point (SCP), and the $ZZSTO subsystem
manager are described in the NonStop S-Series Planning and Configuration Guide.
When you enter an SCF command, SCF first determines which subsystem can process the command.
SCF then directs the command to the appropriate subsystem through the Subsystem Control Point
(SCP).
Manager Processes
Storage Subsystem Manager ($ZZSTO)
The $ZZSTO storage subsystem manager process is a generic process that uses SCF to perform
persistent configuration and management. That is, when you use SCF to change the system
configuration database, the changes survive a system load. After you configure storage subsystem
objects online, $ZZSTO maintains this configuration information in the system configuration database
($SYSTEM.ZSYSCONF.CONFIG).
You can use SCF to configure any storage device except the system disk while the system continues
to do other processing. Configuration changes made online using SCF take effect as soon as the
SCF Interface to the Storage Subsystem 25