6.4

Table 1‑2. Memory Metric Group
Metric Description
Memory|Balloon (KB) This metric shows the total amount of memory currently
used by the VM memory control.
Use this metric to monitor how much VM memory the
ESXi has reclaimed through memory ballooning.
The presence of ballooning indicates that the ESXi has been
under memory pressure. ESXi activates ballooning when
its consumed memory reaches a specic threshold. For
example, in vRealize Operations Manager 6.0, the
threshold is >98%.
When using this metric, verify if the size of the ballooning
is increasing. An increase in ballooning indicates that the
lack of memory is not a one time occurrence, and that the
memory shortage is worsening. Look for memory
uctuations which indicate that the VM required the
ballooned out page. If the VM requests a ballooned out
page, this translates into a memory performance problem
for the VM because the page has to be returned from the
disk.
When the balloon target value is greater than the value
shown by the metric, it means that there is more available
memory that can be reclaimed.
Memory|Contention (%) This metric shows the percentage of time VMs are waiting
to access swapped memory.
Use this metric to monitor ESXi memory swapping. A high
value indicates that the ESXi is running low on memory,
and a large amount of memory is being swapped.
Memory|Usage (%) This metric shows the amount of physical memory actively
used. The memory usage is displayed as a percentage of
the total congured or available memory. This metric maps
to the Consumed counter in vCenter.
When the metric displays a high value, it indicates that the
ESXi is using a large percentage of available memory.
Check other memory-related metrics to see if the ESXi
requires more memory.
Table 1‑3. Network Metric Group
Metric Description
Network I/O | Aggregate of all instances | Packet Dropped
(%)
This metric shows the percentage of received and
transmied packets dropped in the collection interval.
Use this metric to monitor the reliability and performance
of the ESXi network. A high value indicates that the
network is not reliable and performance decreases.
Network I/O | Aggregate of all instances | Packet Received
per second
This metric shows the number of packets received in the
collection interval.
Use this metric to monitor the network usage of the ESXi.
Network I/O | Aggregate of all instances | Packet
Transmied per second
This metric shows the number of packets transmied
during the collection interval.
Use this metric to monitor the network usage of the ESXi.
vRealize Operations Manager User Guide
48 VMware, Inc.