Hi Erhan, this directory contains the files related to SD agents used by the Scalability Server (if it's the DM is used by its own internal Scalability Server) so these files are needed. Each computer and user has its own directory and files under each of them as they link the users with the computers and also the container/job information is stored there. Also, you may see cached information in the main directory for information not yet updated in the DM as maybe some agents are not registered yet but the SD registration information has already been registerd in the Scalability Server.
The sd_server process usually do a housekeeping of this directory but if you feel there're too many for the number of computers and users in the system, we can investigate it but we'll need to deal with it in an issue in support.ca.com as we'll need to check the MDB and the whole directory while also forcing a housekeeping to check if the cleanup is done correctly.
Which version are you running?
Kind regards, Xavier.