VMware vSphere® Performance by Matt Liebowitz & Christopher Kusek & Rynardt Spies

VMware vSphere® Performance by Matt Liebowitz & Christopher Kusek & Rynardt Spies

Author:Matt Liebowitz & Christopher Kusek & Rynardt Spies
Language: eng
Format: epub, mobi
ISBN: 9781118235584
Published: 2014-02-06T00:00:00+00:00


Memory Reservations

Memory reservations allow administrators to effectively guarantee that a given virtual machine will be allocated a set amount of memory. When a virtual machine is configured with a memory reservation, the ESXi host will ensure that the reservation is honored and will not reclaim memory from the virtual machine below the reservation, even if the virtual machine becomes idle. In other words, idle memory tax does not apply to the memory located within the reservation. However, memory allocated beyond the specified reservation can still be reclaimed and, if idle, can be taxed.

VM1 in Figure 5.15 is configured with a reservation of 512 MB and is therefore guaranteed to be allocated at least 512 MB.



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