Shared-Disk Mode

Shared-disk mode lets you run multiple SAP Control Center instances—SCC servers, SCC agents, or a mixture of the two—from a single installation of the product.

The shared-disk capability enables SCC servers or agents on the installation host or on remote hosts to access and execute from the same installation. This feature is especially useful if you plan to use SCC to manage SAP® ASE clusters, SAP® Sybase® Event Stream Processor clusters, or SAP Sybase IQ multiplexes.

After installing SCC on a shared disk, use the sccinstance command to enable shared-disk mode and deploy instances. sccinstance copies the files needed for the instance into a new directory structure. The path takes the form <SCC-install-directory>/instances/<instance-name> (for example, SCC-3_3/instances/SCCserver-1).

You can specify a name for each instance. If you do not supply a name, the instance name defaults to the host name.

An instance runs on the host on which you start it. When shared-disk mode is enabled, SCC servers and agents run out of the SCC-3_3/instances subdirectories, not from the base file system.

In shared-disk mode, changes made to configuration files in the base file system (everything under SCC-3_3 except the SCC-3_3/instances branch) are copied to any instance deployed thereafter. Previously deployed instances are not affected.

Use sccinstance to deploy, remove, refresh, or convert an instance; to configure an instance’s ports; and to configure a Windows instance to run as a service. Perform other tasks, including configuring a UNIX instance to run as a service, and all other configuration, using the tools and procedures documented for all installations. Use tools provided by the UI wherever possible. When you must edit a file to change the configuration of an instance (for role mapping, for example), edit the copy of the file stored under <SCC-install-directory>/instances/<instance-name>.

Related concepts
Related tasks
Enabling and Disabling Shared-Disk Mode
Related information
sccinstance Command