Understand the impact of expandable reservations in VMware vSphere 6 and potential drawbacks that may result from excessive reservations.
- [Voiceover] In this video I'll explain…how resource pool reservations are effected…by configuring expandable reservations.…Resource pools can contain multiple objects…such as virtual machines and child resource pools.…And we can configure shares, limits,…and reservations on a resource pool.…Whenever we're dealing with reservations…we have to take admission control into consideration.…Admission control prevents virtual machines…from booting if their reservations cannot be satisfied.…It also prevents us from configuring…reservations on a resource pool…if they cannot be satisfied.…
At times we may need to create reservations…on objects within a resource pool.…These reservations must be satisfied…by the parent resource pool.…The reservations on the child objects…might actually exceed what the parent pool can provide.…This can result in admission control errors.…And we may not be able to boot up virtual machines…with reservations inside this pool.…We can relax these admission control…requirements by configuring expandable reservations.…
VMware Certified Instructor Rick Crisci provides an overview of vSphere resource controls—shares, limits, and reservations—and their impact on performance and VSWP file size. Rick explains exactly what happens when virtual machines compete for resources, the role of swap files, and how resource controls help automate allocation.
In chapter 2, Rick shows how to manage performance with resource pools, including child pools. He explains the impact a reservation has on resource pools, and includes a demo on creating and configuring a resource pool. Chapter 3 is an overview of the vFlash architecture for leveraging SSD resources. Watch this chapter to learn how to configure vFlash reservations and to assign a reservation to a VM.
Note: This course maps to the Administer and Manage vSphere 6.x Resources domain of the vSphere Certified Professional 6—Data Center Virtualization (VCP6DCV) exam.
- Allocating memory and CPU
- Using ESXTOP
- Configuring reservations, limits, and shares
- Managing performance with resource pools
- Creating child and tiered resource pools
- Leveraging SSD resources with vFlash