ETERNUS CS is the virtual archive system provided by Fujitsu.
With ETERNUS CS, a virtual archive system is inserted ahead of the real archive system with the real MTC devices and volumes. The virtual archive system contains a number of virtual devices and volumes. The core of ETERNUS CS is a disk system in the form of a data cache. This not only ensures extremely high-speed access to the data, but, thanks to the large number of virtual drives and logical volumes, existing bottlenecks in a real tape robot system are eliminated.
From the point of view of its connected BS2000 systems, ETERNUS CS acts as a real archive system with MTC devices of type 3590E and LTO-U4. It buffers logical volumes on a RAID disk system. Under the control of the Library Manager, these volumes are backed up in a real archive system. Data is restored by means of the reverse process, where the real robot of the archive system is only called on to act if the volumes are no longer present on the disk.
For more detailed information on the virtual archive system, read the manual “Operating and administrating the ETERNUS CS8000” [11].
The configuration parameters and settings recommended in the manual and in the ETERNUS CS Release Notice should be employed when using ETERNUS CS.
ROBAR controls the virtual archive system ETERNUS CS, but not the real archive system downstream of it. The ETERNUS CS software manages the real archive system with its MTC devices and volumes.
ROBAR controls ETERNUS CS with its virtual MTC devices via the ABBA interface (see "ABBA interface") using a special, autonomous ROBAR rule file. The archive record consists of the databases of the ETERNUS CS software.
ROBAR is the communication interface between the BS2000 system and ETERNUS CS. The BS2000 systems reserve the virtual MTC devices. A BS2000 system has direct and exclusive access only to the virtual MTC device. Robots operate the real MTC devices. ETERNUS CS provides the data.
An overview of the components is provided in figure 3.
ROBAR messages and indications still generally relate to a real archive system. The message ROB9802 indicates a problem within ETERNUS CS.
The term archive system means a virtual archive system when relating to ETERNUS CS. In ETERNUS CS, AMU means the virtual AMU (VAMU).
