The distributed lock manager (DLM) provides parallel cache management
for OPS. Each node in an OPS cluster starts an instance of the DLM
process when the node joins the cluster, and the instances then communicate
with each other over the network. DLM timing and other parameters
for an OPS cluster are stored in the cluster configuration file and
in a specific DLM configuration file.
DLM Configuration Files (OPS 7.3.x) |
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One set of DLM parameters is stored along with the cluster
configuration data in the cluster configuration file. Known as cluster
interface parameters, they are a specific set of interval
and timing parameters which ensure that the cluster manager can
recognize the failure of the DLM when it occurs.
A second set of DLM configuration parameters is located in
a binary DLM configuration file which is stored on all nodes in
the cluster. These parameters, known as internal parameters,
allow the DLM to operate smoothly with a particular OPS configuration.
The Oracle database administrator and the HP-UX system administrator
together decide on the values for the internal parameters. Details
are given in the chapter "Chapter 4 “Planning and Documenting and OPS
Cluster”."
The DLM configuration file may be created or modified using
SAM or using HP-UX commands. Details are given in the chapter "Chapter 5 “Building an OPS Cluster Configuration”."
The DLM subnet may be an Ethernet, FDDI, or FibreChannel network. DLM
traffic cannot run on the following:
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