VMware CLOUD DIRECTOR 1.0 Instrukcja Użytkownika Pobierz pdf (Strona 12)

PERFORMANCE STUDY /12

VMware vCloud Director 1.0 Performance and Best Practices

Figure 7. OVF File Upload Latency Breakdown for Different File Sizes

Concurrent OVF File Upload Latency

In a production environment, a single cell handles multiple, concurrent OVF file transfers at the same time. The

performance characterization of the OVF file upload changes when the disk I/O pattern goes from sequential I/O

to random I/O. This is shown in Figure 8. Comparing the first bar with the second bar, to upload two OVF files

concurrently, each file transfer latency is almost doubled. The effectiveness of random disk I/O between two

concurrent file transfers and three concurrent file transfers is much less significant as shown in the second bar

and the third bar of Figure 8.

For this experiment, the vCloud Director server ran in a 64-bit Red Hat Linux 5 virtual machine with 4 vCPUs and

8GB RAM. The OVF file transfer location was on the same disk as the cell log files. A local disk of an ESX host

served as the datastore to back up the cell VM.

200

400

600

800

1000

1200

947MB

2036MB

6383MB

Latency in Seconds

File Size

cell2vSphere

cell prepare

client2cell

client checksum

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 31 32

Brak uwag

VMware CLOUD DIRECTOR 1.0 Instrukcja Użytkownika Strona 12