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consider the communication delays caused by propagating the SLA objects
among the relevant parties in the distributed environments. Figure 10.9a
shows the absolute values of the average communication delay of differ-
ent stages, and Figure 10.9b shows the percentage value of the overall
communication delays. As we can see the communication delays of stages
1, 3, 4, 6, and 7 are very short (within just a few seconds), while stages 0, 2,
5, and 8 consume longer time than the previous ones and take up to 28%
of the communication delay of overall communication delay in SLA nego-
tiations. The communication time for retrieving data objects remotely
from either client or service provider to its remote SAP takes a much longer
time compared with the other stages in the SLA negotiations. This is
(a)
FDS SLA management communication time
16
15
14
12
12
10
8
8
8
6
4
4
4
2
1
1
1
0
0
1
2
3
4
5
6
7
8
Stages
(b)
Pie chart of FDS SLA communication time
Stage 0
15%
Stage 8
22%
Stage 1
7%
Stage 7
7%
Stage 2
15%
Stage 6
2%
Stage 3
2%
Stage 4
2%
Stage 5
28%
FIGURE 10.9
FDS SLA manager's communication delay over SSP: (a) communication time
of different stages; (b) pie chart of communication time of different stages.
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