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Excerpt

The platform uses configuration properties to control the number of concurrent operations for to:

  • a hypervisor
or
  • provider
,
  • device
, or
  • backup manager.
  The
  •   

The platform can control concurrency for:

  • VM operations
and many kinds of entities
  • Entities associated with VMs
(
    • firewalls
,
    • load balancers
,
    • NAT IPs
, and
    • backups
)
    • .

You can now define limits for concurrency limits at the level of:

  • the platform
  • a specific hypervisor type or provider (e.g. vCloud with no concurrency) without affecting other types (e.g. ESXi with maximum concurrency).
And you can also change the context of concurrency control to the VDC level. This means that the
  • VDCs so the platform can limit concurrent operations that affect the same virtual datacenter, while allowing concurrent operations to other VDCs.
You set limits at the
  • The platform applies the limits (platform or provider
level, and the platform applies these limits
  • ) PER VDC.  

You can also allow concurrent operations that to change the state of a VM (e.g. power on), while limiting concurrent configure operations.

For documentation of the individual concurrency control properties, see See the "openSession" properties at Abiquo Configuration Properties#virtualfactoryconfiguration properties#virtualfactory

List of VM operations for which the platform controls concurrency

...

  • VM state changes (powerOn, powerOff, etc)
  • Configure/Deconfigure/Reconfigure VM
  • Register/Unregister/Update VM with Firewall Policy / Load Balancer / Nat Rule 
  • Perform Backup / Schedule Backup / Restore From Backup of a VM 

An example of when the application of concurrency limits apply is when you are deploying a virtual appliance with multiple VMs.

...

Allow fast VM state changes

When you use the fast state changes functionality, the platform will always execute VM state changes when you request them, without waiting for any concurrent operations to finish.

The VM state change operations are as follows: 

...

Code Block
java
java
abiquo.virtualfactory.openSession.faststatechanges=true

...

For example, with the following configuration, the platform will only allow one configure/deconfigure/reconfigure at a time, but several state changes can occur concurrently.
...