Configure Local and Remote Backup Servers

Before you perform dumps and loads, you must configure the local and remote Backup Servers at start-up by providing appropriate values for the system resources that are controlled by the command line options.

See the Utility Guide for a complete list of the command line options.

If your system resources are not configured properly, the dump or load may fail. For example, a remote dump to more than 25 stripes with the local and remote Backup Servers started with default configuration fails, because the maximum number of network connections that Backup Server can originate (specified by the -N option) is 25; however, by default, the maximum number of server connections into the remote Backup Server (specified by the -C option) is 30.

If these parameters are not configured properly, when a dump is started to (or a load is started from) a large number of stripes, the operation may abort because of lack of system resources. You receive a message that Backup Server cannot create or attach to a shared memory segment and therefore, the SYBMULTBUF processes are terminated.

• Setting Shared Memory Usage
  Use the -m parameter to set the shared memory for Backup Server.
• Configuring Shared Memory Dumps
  Use the memory dump compression level configuration parameter to configure SAP ASE to compress shared memory dump files, which significantly reduces the size of them.
• Setting the Maximum Number of Stripes
  The maximum number of stripes that Backup Server can use is limited by the maximum number of Open Server threads it can create. Open Server imposes a maximum limit of 12K on the number of threads an application can create.
• Setting the Maximum Number of Network Connections
  The maximum number of network connections a local Backup Server can originate is limited by Open Server to 9118.
• Setting the Maximum Number of Service Threads
  The -P parameter for Backup Server configures the number of service threads Open Server creates.