Virtualization admins, thus, have a serious conundrum in front of them. Exhausted resources can lead to serious downtime within the enterprise and can create discontentment among the employees. It’s easy for enterprises to jump into oversubscription bandwagon, however, effective mitigation measures are needed to ensure that VDI performance remains the top priority. As mentioned earlier, it is better to be proactive than reactive.įor enterprises, the sooner the bottleneck gets resolved, the better. This can have serious impact on an enterprise’s workflow as then every remedial action performed by the virtualization admins become a reactive task. Two, if the percentage value is too high, the alarms will be triggered late. One, if the percentage value is kept low, then the alert will be triggered early which can lead to wastage of space. When the capacity exceeds the predetermined free space, the datastore alarm will alert the administrator who then performs the necessary action–either increase the storage capacity or add more datastores to migrate virtual machines.įurthermore, administrators have to consider two factors while setting the percentage value of an alarm. However, administrators can alter the percentage values for Warning and Alert according to the convenience of an enterprise. The alarm also triggers an alert message when the used disk space on the datastore exceeds 85 percent. The vCenter Server comes with a default alarm for datastore usage which normally triggers a warning message when the capacity exceeds 75 percent. Virtualization administrators can enable alarms to monitor the available space as well as the percentage of over-allocation on a vSphere datastore. In addition, Storage vMotion causes no downtime for enterprises. During the procedure, the virtual machine retains network identity and connections, thus, warranting a smooth migration process. Migration of a running virtual machine can be performed through Storage vMotion, an in-built component of VMware. The process of migrating virtual machines to new datastores is known as a service intervention by administrators. The main benefit of monitoring is that it enables administrators to be proactive rather than reactive. Moreover, with the help of Storage vMotion the support staff can migrate any virtual machine to a different datastore where there is enough capacity to carry out operations without glitches. If strict monitoring measures are in place, administrators can add more space to a datastore that is on the brink of exhaustion. The primary solution for mitigating the risks involved in storage oversubscription is to monitor the amount of available space in a datastore. Here are some of the best practices whereby enterprises can utilize the benefits of oversubscription while containing the risks: The cons of oversubscription can be mitigated through constant monitoring and applying proper control measures when required. Moreover, retrieving lost data is a very costly affair. However, once an oversubscribed resource gets exhausted, stability issues can creep up along with other many other issues like virtual machine startup failures, snapshot creation glitches, erratic performance and data loss. Oversubscription enables administrators to make use of idle resources thereby maximizing the enterprise’s storage efficiency without downtime. The term oversubscription refers to the various methods by which more resources than physically is allocated on a vSphere datastore.
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