Directory Server uses file descriptors when handling concurrent client connections. A low maximum number of file descriptors that are available for the server process can thus limit the number of concurrent connections. Recommendations that concern the number of file descriptors therefore relate to the number of concurrent connections Directory Server can handle.
On Solaris systems, the number of file descriptors available is configured through the rlim_fd_max parameter. Refer to the operating system documentation for further instructions on modifying the number of available file descriptors.