When Andrew and I built the esx.pm provisioning module that was
developed at the Open Systems Collaboration and Research Lab (OSCaR),
we wanted to build load balancing functionality based on feedback from
the usage of the servers in real time. From our evaluation, there is
not reasonable way to do this with the VCL 2.X architecture. The
heart of the problem is that the 2.X architecture achieves scheduling
through a combination of frontend code, backend code, and a database
in the middle. The placement decision (which hypervisor an image will
run on) is decided in the frontend, so no amount of API's will enable
this decision to be more intelligent without rewriting portions of
both the frontend and backend to being ESX aware and ESX specific.
Over time, integrating a large number of resource types makes this
integration path intractable.
Having tried to implement this into VCL 2.X, this feature use case is
what brought about the proposal of an alternative VCL architecture to
accommodate these types of features and extensions in a more
reasonable way/ (found here: http://cwiki.apache.org/confluence/display/VCL/Experimental+VCL+Architecture+Document)
. An implementation of this experimental architecture is nearing the
proof of concept stage, and I will commit the POC code of the proposed
experimental architecture to a branch of the SVN next week. I would
encourage your team to use that as a starting point for the
integration you propose. It could be done easily by rewriting the
PlacementController component inside the ESX Resource Manager, which
will contain a simple round robin scheduler as it goes to pair images
with hypervisors to run on. More documentation will also be provided
along with the initial code commit to help get you started.
Secure Open Systems Initiative
On May 15, 2009, at 12:44 AM, 杨杰 wrote:
We are now trying to integrate VCL as a provision manager to a load
banlancing tool. The experiment may help us to manage the VMs
the server load automatically.
The task demands definite understand on the API of VCL, which will
considerably advance our experiment. How could i get it ? or is
website to view the API document ?
Thank you !
Team of MRMSS, Xi'an Jiaotong University
Department of Computer Science and Technology, Xi’an Jiaotong
TEL: +8613468883723;029-82665263 EXT.24
Don Marquis <http://www.brainyquote.com/quotes/authors/d/don_marquis.html
- "Procrastination is the art of keeping up with yesterday."