NetBackup ACS daemon (acsd)
The NetBackup ACS daemon acsd provides robotic control to mount and dismount volumes. It also requests inventories of the volumes that are under the control of ACS library software. the Media Manager device daemon ltid starts the acsd daemon and communicates with it. If ltid is active already, you can start acsd manually.
The acsd daemon requests SCSI tape unloads through the device host's tape driver before it uses the ACS API to request that tape dismounts. This control process accommodates the configurations that have SCSI multiplexors. Loaded tapes are not ejected forcibly when a dismount operation occurs.
When acsd starts, it first starts the NetBackup acssel process and then starts the acsssi process. When it starts acsssi, acsd passes the ACS library software host name to acsssi. One copy of acsssi starts for each ACS library software host that appears in the NetBackup device configuration for the media server. If multiple media servers share drives in an ACS robot, acsssi must be active on each media server.