Queueing Aspects of Integrated Information and Computing Systems in Geosciences and Natural Sciences - Advances in Data, Methods, Models and Their Applications in Geoscience - page 7

Fig. 4. Networks, cabling, switches.
5.6 Systems connection
Linking high end resources is an important factor for ensuring economical use and enabling
for access. In many cases these connections are built for redundancy, in order to switch
connection for maintenance or emergencies.
5.7 System redundancy
Not only systems connections can be created using fallbacks. Figure 5 shows a network switch
connecting some compute resources on redundant pathes. With large numbers of components
the rate of failure increases. Redundancy and appropriate concepts will minimise the risk
due to component failures. Large resources, as we have seen, not only need redundant cores
and memory but various additional redundancies. Figure 5 further shows redundant rack
power supplies, redundant disk drive enclosures with redundant disks, for example with
appropriate RAID level, and redundant meta data storage servers.
Fig. 5. Redundancy with linking resources, rack power supplies, disk drive enclosures and
disks, meta data storage servers.