6.0.1

Action
Parameter in the
vSphere Web Client
Parameter for the esxcli
system settings sdvanced
set Command
Value
Set a default interrupt rate higher
than the expected packet rate. For
example, set the interrupt rate to
16000 if 15000 interrupts are expected
per second.
Net.CoalesceScheme
Net.CoalesceParams
/Net/CoalesceScheme
/Net/CoalesceParams
rbc
16000
Disable coalescing for low
throughput or latency-sensitive
workloads. For information about
configuring low-latency workloads,
see Best Practices for Performance
Tuning of Latency-Sensitive
Workloads in vSphere VMs.
Net.CoalesceDefaultOn /Net/CoalesceDefaultOn
0
Revert to the coalescing scheme from
earlier ESXi releases.
NOTE The ability to revert to the
earlier algorithm will not be available
in later vSphere releases.
Net.CoalesceScheme /Net/CoalesceScheme
calibrate
For information about configuring a host from the vSphere Web Client, see the vCenter Server and Host
Management documentation. For information about setting host properties by using a vCLI command,
refer to the vSphere Command-Line Interface Reference documentation.
Virtual Machines on the Same Distributed Port Group and on Different
Hosts Cannot Communicate with Each Other
Under certain conditions, the virtual machines that are on the same distributed port group but on different
hosts cannot communicate with each other.
Problem
Virtual machines that reside on different hosts and on the same port group are unable to communicate.
Pings from one virtual machine to another have no effect. You cannot migrate the virtual machines between
the hosts by using vMotion.
Cause
n
There are no physical NICs on some of the hosts assigned to active or standby uplinks in the teaming
and failover order of the distributed port group.
n
The physical NICs on the hosts that are assigned to the active or standby uplinks reside in different
VLANs on the physical switch. The physical NICs in different VLANs cannot see each other and thus
cannot communicate with each other.
Solution
n
In the topology of the distributed switch, check which host does not have physical NICs assigned to an
active or standby uplink on the distributed port group. Assign at least one physical NIC on that host to
an active uplink on the port group.
n
In the topology of the distributed switch, check the VLAN IDs of the physical NICs that are assigned to
the active uplinks on the distributed port group. On all hosts, assign physical NICs that are from the
same VLAN to an active uplink on the distributed port group.
vSphere Troubleshooting
92 VMware, Inc.