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Flow Control Policy
Flow control policies determine whether the uplink Ethernet ports in a Cisco UCS domain send and receive
IEEE 802.3x pause frames when the receive buffer for a port fills. These pause frames request that the
transmitting port stop sending data for a few milliseconds until the buffer clears.
For flow control to work between a LAN port and an uplink Ethernet port, you must enable the corresponding
receive and send flow control parameters for both ports. For Cisco UCS, the flow control policies configure
these parameters.
When you enable the send function, the uplink Ethernet port sends a pause request to the network port if the
incoming packet rate becomes too high. The pause remains in effect for a few milliseconds before traffic is
reset to normal levels. If you enable the receive function, the uplink Ethernet port honors all pause requests
from the network port. All traffic is halted on that uplink port until the network port cancels the pause request.
Because you assign the flow control policy to the port, changes to the policy have an immediate effect on how
the port reacts to a pause frame or a full receive buffer.
Maintenance Policy
A maintenance policy determines how Cisco UCS Manager reacts when a change that requires a server reboot
is made to a service profile associated with a server or to an updating service profile bound to one or more
service profiles.
The maintenance policy specifieshow Cisco UCS Manager deploys the service profile changes. The deployment
can occur in one of the following ways:
• Immediately
• When acknowledged by a user with admin privileges
• Automatically at the time specified in the schedule
If the maintenance policy is configured to deploy the change during a scheduled maintenance window, the
policy must include a valid schedule. The schedule deploys the changes in the first available maintenance
window.
Scrub Policy
This policy determines what happens to local data and to the BIOS settings on a server during the discovery
process and when the server is disassociated from a service profile. Depending upon how you configure a
scrub policy, the following can occur at those times:
Disk Scrub
One of the following occurs to the data on any local drives on disassociation:
• If enabled, destroys all data on any local drives
• If disabled, preserves all data on any local drives, including local storage configuration
Cisco UCS Manager GUI Configuration Guide, Release 2.0
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Server Architecture and Connectivity