Technical data

• NC360m — C-class Mezz card
• NC364m — C-class Mezz card
7.2.11 Calculating the Actual Utilization of the Virtual Network Card
The emulation of the virtual network I/O card is based on the Intel I8254X family. Thus, the
virtual network card (vNIC) is presented to the guest operating system as PCI-X 1000Base-T with
the speed of 1 Gb regardless of the physical network interface card backing the vswitch. This
emulation could lead to an incorrect calculation of vNIC performance by some network
performance applications on the guest. For example, on a Windows guests, the Task Manager
—> Network Performance display shows 1 Gb utilization. All calculations on the Windows
utilization are then based upon this value rather than the speed of the backing device on the VM
Host.
To accurately calculate vNIC performance, take into consideration the speed of the backing
device on the Integrity VM Host.
7.2.12 Using IP Alias Addresses in the Guest Not Supported for IPv4 or IPv6
Integrity VM Version 4.1 does not support the use of IP alias addressing in the guest for either
IPv4 or IPv6.
7.2.13 Sufficient Memory for Guests with Virtual LAN Devices
If the guest is configured with a number of virtual LAN devices and the guest does not have
sufficient memory, some of the devices could be missing after the guest is booted. To resolve
this issue, increase the size of guest memory with the hpvmmodify -r command.
For more information, see Section 4.2 (page 42).
7.2.14 Vswitches Are Always in SHARED Mode
The hpvmnet command displays the status of the vswitches, including the mode. The vswitches
are always in SHARED mode. No other modes are supported at this time.
7.2.15 Do Not Use the HP A5506B PCI 10/100Base-TX 4 Port Interface for Virtual
Networking
Host to guest connectivity might not be reliable when using the HP A5506B PCI 10/100Base-TX
4 Port interface for guest networking.
7.2.16 Integrity VM V4.1 Does not Support Gelan Drivers
Gelan drivers are not supported with Integrity VM Version 4.1 and later.
7.2.17 MAC Address Validation Can Be Enhanced
When you add a virtual NIC to your guest, Integrity VM checks to make sure the MAC address
is unique.
By default, Integrity VM makes three attempts (each with a one-second timeout) to determine
the validity of the MAC address for the virtual NIC. This process can result in up to ten seconds
of delay for each defined virtual NIC. To speed up this processing, add the following tunable to
the /etc/rc.config.d/hpvmconf configuration file:
HPVMMACADDRFRAMES=n
Where n is the number of attempts (1 to 30). The default is 3. A value of 1 or 2 increases
performance at the risk of missing a response from a slow NIC.
74 Networking Information