MAX_SBD_CONNS

Sets the maximum number of open file connections between the mbatchd and sbatchd daemons. The system sets the MAX_SBD_CONNS parameter automatically during mbatchd startup.

Syntax

MAX_SBD_CONNS=integer

Description

MAX_SBD_CONNS and LSB_MAX_JOB_DISPATCH_PER_SESSION affect the number of file descriptors. To decrease the load on the management host LIM you should not configure the management host as the first host for the LSF_SERVER_HOSTS parameter.

The default values for the MAX_SBD_CONNS and LSB_MAX_JOB_DISPATCH_PER_SESSION parameters are set during mbatchd daemon startup. They are not changed dynamically. If hosts are added dynamically, mbatchd does not increase their values. Once all the hosts have been added, you must run the badmin mbdrestart command to set the correct values. If you know in advance that your cluster will dynamically grow or shrink, you should configure these parameters beforehand.

Default

MAX_SBD_CONNS = 2 *
number_of_hosts + 300

. This formula does not provide the exact number of sbatchd connections because it also calculates the lost and found hosts. Therefore, the calculated number of connections might be a few more than this theoretical number.

Tip: If you enabled the IBM® Spectrum LSF resource connector, there can be many LSF server nodes joining and leaving from the LSF clusters frequently. In this case, rather than use the default value for MAX_SBD_CONNS, define a more reasonable value. For example, set it as MAX_SBD_CONNS = 2 * maximum_number_of_hosts + 300.