So it is not really necessary to do so, but if load in a cluster is predictable, it is possible to save resources for calculating operations of DRS. This way the server cluster is better prepared for non predictable situations, which can appear all the time. VMware DRS can be run either in automatic or manual mode.[90] The situations mentioned above, belongs to the automatic mode. In the manual mode DRS just give recommendations on which server to put a specific VM. The decision and the movement of the VMs itself are up to the administrator in that case. This is useful for very critical environments where it is necessary that every action of the software has to be reviewed by the administrator before making a final change. But here an administrator needs to monitor the server cluster at any time. An additional feature of DRS is the maintenance mode. It allows maintenance and server changes without disruption to virtual machines and users. This can be realized again either in automatic or manual mode. While a server is put into maintenance status, all its VMs are moved to the other servers in the cluster. The users do not notice anything about the maintenance and are able to continue their work on the VMs. Using the automatic mode, the server maintenance can be realized completely automatically. In conclusion VMware DRS is a powerful tool with many options for a powerful dynamic load balancing in virtualized environments.
Posted on: Mon, 14 Jul 2014 04:37:17 +0000
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