Database Reference
In-Depth Information
Table 8.6 shows a sample configuration of NIOC resource pools with a user-defined
resource pool for SQL Server replication. It includes the share's values and calculation
for the percentage entitlement of bandwidth of each of the different resource pools.
Although it is possible to tag each resource pool with a class of service (or 802.1p
priority tag, in this example), we are happy for the vSphere hosts to control traffic
priority.
Table 8.6 Sample Network I/O Control Resource Proportional Shares
The shares and the minimum percentage bandwidth entitlement comprise the worst-case
scenario of the total bandwidth a network resource pool will be allocated in times of
contention. This guarantees quality of service when a network adapter is saturated. The
share of transmit bandwidth available to a network resource pool is determined by the
network resource pool's shares and what other network resource pools are actively
transmitting. Where not all network resource pools are transmitting and competing, the
proportion of bandwidth available to each traffic type will be based on the relative
shares. We recommend you always use shares rather than specific host limits for
bandwidth per resource pool.
For example, if only virtual machine and vMotion traffic are being transmitted on a
congested physical adapter, based on the shares in Table 8.6 , their traffic will be
controlled in a proportion of 100 shares (VM traffic) to 25 shares (vMotion traffic).
This would result in VM traffic being entitled to up to 80% of the adapter bandwidth.
This is calculated as follows:
Bandwidth Entitlement = Network Resource Pool Physical Adapter Shares /
Combined Shares of Transmitting Resource Pools
 
 
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