VMware CLOUD DIRECTOR 1.0 Manuel d'utilisateur télécharger pdf (Page 28)

PERFORMANCE STUDY /28

VMware vCloud Director 1.0 Performance and Best Practices

Note: Reconnecting a vCenter will incur some down time for actions performed against that particular vCenter,

so we recommend you reconnect the vCenter when overall vCloud Director activity is low. It usually takes

between 5-30 seconds to move the VC Listener from one cell to another because vCloud Director has to

disconnect from the current cell and connect back from a different cell. This process will not affect currently

running VMs in any way; they will continue to function without any interruption.

Adjusting Thread Pool and Cache Limits

A vCloud Director installation has preconfigured limits for concurrent running tasks, various cache sizes, and

other thread pools. These all are configured with good default values, which are tested to work within an

environment of 10,000 VMs. Some of these numbers are also configurable in case you want to adjust them. You

must restart the cell for the changes to go into effect.

Table 4. Thread Pool Limits

THREAD

POOL

DEFAULT

SIZE (FOR

EACH CELL)

USAGE/INFORMATION HOW TO ADJUST

Tasks

128 Maximum number of concurrent tasks that can

be executed per cell of a vCloud Director

installation. This is a global task count and is not

scoped per user or organization. Different cells

of the same vCloud Director installation can

have different values.

org.quartz.threadPool.threadCount = N

Where N is some number of concurrent

tasks you want to run on a given cell.

Thumbnails

32 Maximum number of concurrent threads that

can fetch VM thumbnail images from vCloud

Director Agent running on an ESX host. Only

thumbnail images for running (powered on)

VMs are collected. Thumbnails are also retrieved

in batches, so all VMs residing on the same

datastore or host will be retrieved in batches.

vCloud Director only fetches thumbnails if they

are requested and once fetched, also caches

them. Thumbnails are requested when a user

navigates to various list pages or the dashboard

that displays the VM image.

Not configurable.

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VMware CLOUD DIRECTOR 1.0 Manuel d'utilisateur Page 28

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