VMware 4817V62 - vSphere - PC, Administration Manual

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Table C-5. Memory Data Counters (Continued)
Counter Label Description
Entity
V H R C
overhead Memory
Overhead
Amount of additional machine memory allocated to a virtual
machine for overhead. The overhead amount is beyond the
reserved amount.
VM
Amount of machine memory used by the
VMkernel to run the virtual machine.
Host
Total of all overhead metrics for powered-
on virtual machines, plus the overhead of
running vSphere services on the host.
n
Stats Type: absolute
n
Unit: kiloBytes
n
Rollup Type: average (min/max)
n
Collection Level: 1(4)
• ο ο ο
reservedCapacity Memory
Reserved
Capacity
Total amount of memory reservation used by powered on VMs
and vSphere services on the host. Includes overhead amount.
n
Stats Type: absolute
n
Unit: megaBytes
n
Rollup Type: average
n
Collection Level: 2
ο • ο •
shared Memory
Shared
VM
Amount of guest physical memory that is
shared with other virtual machines
(through the VMkernel’s transparent page-
sharing mechanism, a RAM de-duplication
technique). The value of shared includes the
size of the zero memory area.
Host
Sum of the shared memory values of all
powered-on virtual machines, plus the
amount for the vSphere services on the host.
The host’s Memory Shared may be larger
than the amount of machine memory if
memory is overcommitted (the aggregate
virtual machine configured memory is
much greater than machine memory). The
value of this statistic reflects how effective
transparent page sharing and memory
overcommitment are for saving machine
memory.
n
Stats Type: absolute
n
Unit: kiloBytes
n
Rollup Type: average (min/max)
n
Collection Level: 2(4)
• • ο ο
sharedcommon Memory
Shared
Common
Amount of machine memory that is shared by all powered-on
virtual machines and vSphere services on the host.
Memory Shared - Memory Shared Common = Host memory
saved by sharing
n
Stats Type: absolute
n
Unit: kiloBytes
n
Rollup Type: average (min/max)
n
Collection Level: 2(4)
ο • ο ο
Appendix C Performance Metrics
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