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• Operation as a shared-root file system
• Support for multiple-block sizes (each volume can have a different block size) up
to 4 KB, for a maximum volume size of 16 TB
• Support for up to 255 cluster nodes
• Context-dependent symbolic link (CDSL) support for node-specific local files
• Asynchronous and direct I/O support for database files for improved database per-
formance
13.1.2 O2CB Cluster Service
The O2CB cluster service is a set of modules and in-memory file systems that are re-
quired to manage OCFS2 services and volumes. You can enable these modules to be
loaded and mounted system boot. For instructions, see
OCFS2 Services"
(page 274).
Table 13.1
O2CB Cluster Service Stack
Service
Node Manager (NM)
Heartbeat (HB)
TCP
Distributed Lock Manager
(DLM)
CONFIGFS
Description
Keeps track of all the nodes in the /etc/ocfs2/
cluster.conf file
Issues up/down notifications when nodes join or leave
the cluster
Handles communications between the nodes with the
TCP protocol
Keeps track of all locks and their owners and status
User space configuration file system. For details, see
Section 13.1.4, "In-Memory File Systems"
Section 13.2.2, "Configuring
(page 270).
Oracle Cluster File System 2
269
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Troubleshooting
