HP Virtual Connect 8Gb 24-port Fibre Channel Module for c-Class BladeSystem - Manual (Page 143)

Configuring the Virtual Connect domain using the CLI 143
Virtual Connect provides the ability to enable or disable network loop protection. The feature is enabled by
default and applies to all VC-Enet modules in the domain. Network loops are detected and server ports can
be disabled even prior to any enclosure being imported.
A loop-protect reset command resets and restarts loop detection for all server ports in a “loop-detected” error
condition.
Server blade power on and power off guidelines
Certain server profile changes require the server blade in the device bay to be powered off before the
change can be made. HP recommends that administrators power off servers with the server console before
attempting such operations within the Virtual Connect Manager.
If any changes are made to a server profile that require modifications to the server, the server blade must be
powered off. Network or fabric changes do not require the server blade to be powered off. Server side
settings include the following:
• Assigning a VC- or user-defined MAC address
• Changing the PXE setting
• Assigning a VC-defined WWN
• Changing the Fibre Channel boot parameters
• Changing iSCSI boot parameters
• Adding or deleting a connection of any kind
If any of the listed settings are changing, the server must be powered off before the profile action can occur.
If the server blade is not powered off, a message appears and no changes are made. In this case, power off
the server blade and repeat the action.
When server side settings are changing, the following operations require that server blades be powered off:
• Assigning a profile to a server blade already installed in a device bay
• Deleting a profile, moving a profile to a different device bay, or unassigning a profile from the existing
bay
• Making modifications to a profile that affect settings on the server blade; for example, PXE
enable/disable, changing the number of connections, or changing Fibre Channel boot parameters
• Assigning a VC-assigned serial number
The following operations do not require the server blade to be powered off:
• Changing the network connected to an already defined Ethernet port
• Changing the Fabric connected to a Fibre Channel port
• Changing the speed of a Fibre Channel port
• Assigning or unassigning server profiles, if server factory defaults are used for MAC addresses and
WWNs, BIOS Fibre Channel boot settings are used, and PXE is not being enabled or disabled (USE
BIOS for all network connections)
Exceptions for Flex-10 connection changes are specified in the following sections.
Flex-10 connection changes that require power off
Always power off server blades with Flex-10 connections in the following instances:
• Adding a connection that is mapped to Flex-10