VMware CLOUD DIRECTOR 1.0 Manuel d'utilisateur télécharger pdf (Page 14)

PERFORMANCE STUDY /14

VMware vCloud Director 1.0 Performance and Best Practices

Figure 9. OVF File Upload with WANem Simulator

Compared with DSL, T1 bandwidth is much larger. The total time to upload the same 295MB size VMDK file for T1

is twice as fast as the one on DSL, as shown in Figure 10.

Figure 10. OVF File Upload Trend for T1, DSL, and Satellite Network

Although the bandwidth of a satellite network is 1.5Mbps, which is twice as big as DSL network bandwidth, the

underlying link cannot fully utilize the bandwidth due to the TCP maximum receive window size of 64KB. The

TCP receive window size determines the amount of received data that can be buffered on the receive side before

the sender requires an acknowledgement to continue sending. For a sender to use the entire bandwidth

available, the receiver must have a receive window size equal to the product of the bandwidth and the roundtrip

delay.

100

150

200

250

T1 DSL Satellite

Minutes

VMware vCloud Director 1.0

vCenter Server

vCenter Database

ESX/ESXi Hosts

vCloud Director Cells

vCloud Director

Web Interface

vCloud Director

Database

WANem Simulator

VMware vSphere 4.0

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 31 32

Pas de commentaire

VMware CLOUD DIRECTOR 1.0 Manuel d'utilisateur Page 14