VMware CLOUD DIRECTOR 1.0 Manuel d'utilisateur télécharger pdf (Page 24)

PERFORMANCE STUDY /24

VMware vCloud Director 1.0 Performance and Best Practices

Figure 21. Inventory Sync Latencies

In-Memory Inventory Cache

An in-memory inventory cache is implemented in vCloud Director 1.0. The cache saves the time to fetch inventory

information from the database and the time to de-serialize the database record. Figure 22 demonstrates the

effectiveness of the inventory cache for reconnect-vCenter-sync usage. When the cache size is set to 10,000

inventory items, the cache-hit ratio

Cache-hit ratio is the percentage of accesses to the cache that result in hits.

is much higher. The latency to sync 5000 VMs is also much faster when the

cache-hit ratio is higher.

1000

2000

3000

Seconds

Number of Inventory Items

initial sync restart-cell-sync reconnect-vCenter-sync

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VMware CLOUD DIRECTOR 1.0 Manuel d'utilisateur Page 24