SCF Reference Manual for the Storage Subsystem (G06.27+, H06.04+)

Introduction to the Storage Subsystem
SCF Reference Manual for the Storage Subsystem—529937-008
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Manager Processes
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 object is restarted and persist through processor and
system loads (unless you load the system with a new configuration file).
The storage subsystem includes features to manage both SCSI and Fibre Channel
devices. The Fibre Channel features are collectively called the FCS Manager. FCS
Manager assigns Fibre Channel loops for Fibre Channel disk modules (FCDMs) to the
FCS monitors. FCS Manager also passes OSM requests to the FCS Monitors.
The FCS Monitor Process
The FCS monitor process (FCSMON) is a persistent process that runs in every
processor. FCSMON:
•
Monitors the Fibre Channel loops that connect to the Fibre Channel disk modules
(FCDMs).
•
Accepts requests from FCS Manager and notifies FCS Manager about FCDM
configuration information
•
Sends hardware change events and environmental status change events to
$ZLOG
•
Polls FCDMs for drive insertions and removals
•
Polls the Environmental Management Units (EMUs) in the FCDMs
•
Issues commands to the EMUs
Storage Management Foundation (SMF)
The Storage Management Foundation (SMF) uses SCF to help you manage data
storage on multiple disks. Refer to the Storage Management Foundation User’s Guide
for information about:
•
SMF configuration, management, and troubleshooting
•
File relocation
•
File protection and recovery