Dell PowerVault DP600 - Manual (Page 102)

102
See Also
Increasing Capacity
Managing Performance
Using Network Bandwidth Usage Throttling
Network bandwidth usage throttling limits the amount of network bandwidth that DPM can use to
create and synchronize replicas. Throttling helps to ensure that network bandwidth is available to
applications other than DPM.
The advantage of using network bandwidth usage throttling is that it enables you to limit the
amount of network resources a synchronization job can consume. The disadvantage of network
bandwidth usage throttling is that it can lengthen the amount of time each synchronization job
takes to complete.
Network bandwidth usage throttling is configured for each protected computer. Set network
bandwidth usage throttling in terms of an absolute maximum amount of data to be transferred per
second.
To enable network bandwidth usage throttling
1. In DPM Administrator Console, click Management on the navigation bar.
2. Click the Agents tab.
3. In the Display pane, select a server.
4. In the Actions pane, click Throttle computer.
5. Click Enable network bandwidth usage.
You can configure network bandwidth usage throttling separately for work hours and non-
work hours, and you can define the work hours for the protected computer. Work hours
and non-work hours use the time zone of the protected computer.
Network bandwidth usage can be limited by Group Policy. The Group Policy reservable
bandwidth limit on the local computer determines the combined reservable bandwidth for all
programs that use the Packet Scheduler, including DPM. The DPM network bandwidth usage
limit determines the amount of network bandwidth that DPM can consume during replica creation,
synchronization, and consistency checks. If the DPM bandwidth usage limit, either by itself or in
combination with the limits of other programs, exceeds the Group Policy reservable bandwidth
limit, the DPM bandwidth usage limit might not be applied.
For example, if a DPM computer with a 1-gigabit-per-second (Gbps) network connection has a
Group Policy reservable bandwidth limit of 20 percent, 200 Mbps of bandwidth is reserved for all
programs that use the Packet Scheduler. If DPM bandwidth usage is then set to a maximum of
150 Mbps while Internet Information Services (IIS) bandwidth usage is set to a maximum of
100 Mbps, the combined bandwidth usage limits of DPM and IIS exceed the Group Policy
reservable bandwidth limit, and the DPM limit might not be applied.
To resolve this issue, reduce the DPM setting for network bandwidth usage throttling.