VMware CLOUD DIRECTOR 1.0 Uživatelský manuál stáhnout pdf (Strana 13)

PERFORMANCE STUDY /13

VMware vCloud Director 1.0 Performance and Best Practices

Figure 8. OVF Uploads with 1, 2, and 3 OVF Packages Transferring at the Same Time

File Upload in WAN Environment

Because OVF package upload often occurs in a WAN (Wide Area Network), it is important to show latency

trends with various network bandwidths and speeds. Table 3 shows the bandwidth, latency, and error rate for

three typical networks in a WAN.

Table 3. Typical Networks in a WAN

NETWORK BANDWIDTH LATENCY ERROR RATE

DSL 512Kbps 100ms 0.05%

Satellite 1.5Mbps 500ms 0.10%

T1 1.5Mbps 100ms 0.05%

A WAN simulator, WANem, was used for this experiment. The layout is shown in Figure 9. WANem (Wan Area

Network EMulation) is a piece of software running on Knoppix, a well-known Linux distribution based on Debian.

For more information, refer to the

WANem Simulator Web site

[3].

100

200

300

400

500

600

700

800

1 transfer

2 concurrent

transfers

3 concurrent

transfers

Latency in Seconds

cell2vSphere

cell prepare

client2cell

client checksum

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 31 32

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VMware CLOUD DIRECTOR 1.0 Uživatelský manuál Strana 13