Development and Evaluation of a Virtual PC Type Thin Client System - Data Management in Cloud, Grid and P2P Systems - page 119

delivering the definition file of the virus scan. In the past, the disorder that the
load of the disk I/O soared occurred without grouping having been performed
due to incorrect settings. However, we can now avoid this remarkable rise of disk
I/O by using appropriate grouping.
Fig. 7. Load Balancing by Grouping for Management
5.2 Performance Evaluation of the System That We Built
Objective of Performance Evaluation. Because a virtual PC system is a
system with which a user uses multiple servers at the same time, evaluating
the performance is necessary. The virtual PC system shares one storage unit
with multiple users. Because the OSs are stored in a common storage unit, the
increase of the disk I/O time has a big influence on the user experience during
operation. Therefore, in this section, we pay our attention to a value, the current
disk queue length, which is an index of the disk performance, and we perform a
performance evaluation.
Performance Evaluation Method. First, (1) we find two load level standard
values (in normal load and in peak load) from the actual value of the conventional
system (CB system). (2) We make a load tool that produces an equal load. (3)
We measure how well the system operates while giving a pseudo load with the
load tool to each of the virtual desktop environments for 50 users, 55 users, and
60 users on one server of the virtual PC system 1 . We show items for evaluating
how well the system operated in table 3.
1 With the configuration of the proposed system, the load of one storage depends on
the number of users on one hypervisor. Therefore, an evaluation with 40-60 users is
sucient enough.