User manual

Using iXOS-JUKEMAN
iXOS-JUKEMAN 2.2 User Manual Pre.12/9786
4.2 The server
The jukebox file server is the core of iXOS-JUKEMAN. It controls the de-
vices, and replies to NFS requests and to requests from the iXOS-
JUKEMAN local file system for NT. The server and all the programs and
files it needs are in the JUKEMAN directory. All paths described here are
relative to the JUKEMAN directory.
The server cdnfsd runs as a daemon and receives requests from NFS
clients, from cdadm and from the iXOS-JUKEMAN native file system for
NT. It creates logfile.txt for messages and a database volumes for
disk names and properties. It needs a file server.lic containing the li-
cense key (to use the IFS it also needs a valid writer.lic) and a file
server.cfg containing the server configuration.
To enable task distribution and efficient service to a large number of cli-
ents, the server splits into separate threads. The number of threads in-
creases with the number of devices. They share text and data to minimize
load on the computer.
The server controls devices for handling disks and exports the disks in a
single large file system in which each disk is represented by a directory.
NFS clients need just a single mount, and PC clients connect a single
network drive. The server hides the physical positions of the disks. Each
disk is represented by a subdirectory, whether it is in a storage slot or in a
drive. Clients don’t know if a disk is actually stored in a jukebox, a tower
or is a copy stored in another jukebox. They experience faster access to
the disk because the server chooses the jukebox with less load.