The nsrd server maintains all of the RAP resources that describe the state of any jukeboxes and their associated devices, pools, and operations. The nsrmmgd daemon is the process that is responsible for ensuring that the necessary jukebox operations actually get performed when needed by nsrd.
nsrmmgd runs on the same host as the nsrd server, and there will be at most one such daemon running. Multiple nsrlcpd daemons (one per enabled jukebox) may be started and controlled by nsrmmgd to handle the lower-level control of, and interface to, the various jukeboxes. The nsrlcpd processes that nsrmmgd manages may be distributed across multiple hosts, since nsrlcpd runs on the host that the jukebox is on.
The nsrmmgd daemon is invoked automatically by nsrd when needed, and never needs to be started directly by a user. If nsrd detects that there are any jukeboxes configured and enabled, then it will start nsrmmgd as part of the nsrd startup process. If no jukeboxes are enabled when nsrd starts up, then nsrmmgd will not be started until such time as a jukebox resource gets added, or an existing disabled jukebox resource is enabled.
The RPC program number for nsrmmgd is 390430.