VMware CLOUD DIRECTOR 1.0 Instrukcja Użytkownika Pobierz pdf (Strona 25)

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VMware vCloud Director 1.0 Performance and Best Practices

Figure 22. Sync Time for Inventory Cache Sizes Set to 1000, 5000 and 10,000 with 5000 VMs

Inventory Cache and JVM Heap Size Tuning

vCloud Director maintains an inventory of all vCenter Server entities it manages. A part of this inventory is cached

by each vCloud Director cell. This caching process depends on the size of the cache configured for each cell.

There is one sizing configuration for inventory cache for all cells of the vCloud Director installation. Serialization

and deserialization of vCenter Server entities and querying the database for these objects are expensive. So, the

overall performance of vCloud Director is greatly enhanced by proper sizing. This section describes how this

sizing matters and how inventory cache prioritizes objects.

By default, each vCloud Director cell is configured for 5000 inventory items (total inventory cache entries

including hosts, networks, folders, resource pools, and so on). We estimate that this sizing is optimal for 2000

VMs. Our measurements show that on average, each inventory cache item is about 30KB in size. So, with the

default configuration, an installation supporting 2000 VMs may end up using 5000 × 30KB =

150MB.

Note: For steps to change the inventory cache, see “

Adjusting Thread Pool and Cache Limits” on page 28.

Because the number of supported VMs increases in the vCD when additional vCloud Director cells are added,

proper tuning of this inventory size will help boost performance. We recommend the following formula to help

figure out what number to use for the cache size on each cell:

Inventory Cache Size = 2.5 × (Total Number of VMs in vCloud Director)

We assume here that most VMs in one or more instances of vCenter Server that are managed by vCloud Director

are the ones created by vCloud Director. If that is not the case, substitute the

Total number of VMs in vCloud

Director

with

Total number of VMs in each vCenter Server

As the number of VMs managed by vCloud Director increases, you can either add new vCenter Server instances

to support more VMs, or you can utilize vCenter Server to its full scale (3000 VMs for vSphere 4.0 and 10,000

VMs for vSphere 4.1). Because the inventory in vCloud Director is the aggregate of all vCenter Server inventories

5000 × (30KB) = 5000 × (30 × 1024) bytes = 153,600,000 bytes ÷ 1,048,576 = 146MB

1000

5000

10000

Seconds

Inventory Cache Sizes

reconnect-vCenter-sync

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