https://twiki.cern.ch/twiki/bin/view/PSSGroup/ASM_Internals
- PST - Partner Status Table. Maintains info on disk-to-diskgroup membership.
- COD - Continuing Operation Directory. The COD structure maintains the state of active ASM operations or changes, such as disk or datafile drop/add. The COD log record is either committed or rolled back based on the success of the operation. (source Oracle whitepaper)
- ACD - Active Change Directory. The ACD is analogous to a redo log, where changes to the metadata are logged. The ACD log record is used to determine point of recovery in the case of ASM operation failures or instance failures. (source Oracle whitepaper)
- OSM Oracle Storage Manager, legacy name, synonymous of ASM
- CSS Cluster Synchronization Services. Part of Oracle clusterware, mandatory with ASM even in single instance. CSS is used to heartbeat the health of the ASM instances.
- RBAL - Oracle backgroud process. In an ASM instance coordinated rebalancing operations. In a DB instance, opens and mount diskgroups from the local ASM instance.
- ARBx - Oracle backgroud processes. In an ASM instance, a slave for rebalancing operations
- PSPx - Oracle backgroud processes. In an ASM instance, Process Spawners
- GMON - Oracle backgroud processes. In an ASM instance, diskgroup monitor.
- ASMB - Oracle backgroud process. In an DB instance, keeps a (bequeath) persistent DB connection to the local ASM instance. Provides hearthbeat and ASM statistics. During a diskgroup rebalancing operation ASM communicates to the DB AU changes via this connection.
- O00x - Oracle backgroud processes. Slaves used to connected from the DB to the ASM instance for 'short operations'.
