HP Virtual Connect 4Gb Fibre Channel Module for c-Class BladeSystem - Manual (Page 95)

Server management 95
8. Assign profile connection 8 to LOM port 2 because it is Flex-10 capable and can support up to four
connections.
Bandwidth assignment
In Flex-10 environments, four FlexNICs must share a single 10Gb link. Each FlexNIC is allocated a
portion of that 10Gb link's bandwidth. The bandwidth assigned to the four FlexNICs in a single physical
port cannot exceed 10Gb, but the requested bandwidth settings specified by the user might exceed
10Gb.
Each FlexNIC is assigned a bandwidth value that is a portion of a 10Gb link. A 10Gb NIC might not be
able to saturate a 10Gb link, so FlexNIC bandwidth is limited to a proportion of the NIC's actual
throughput. For example, a FlexNIC that is assigned a requested bandwidth value of 5Gb might not be
able to achieve a full 5Gb of throughput, but that FlexNIC is allocated half of the NIC's actual throughput.
Requested bandwidth is translated to assigned bandwidth with the following rules:
1. FlexNICs with a "preferred" or "custom" value for requested bandwidth receive their allocated
bandwidth first. For example, if the requested bandwidth setting for the four FlexNICs on a given
port are all 2Gb, then each FlexNIC can be assigned 2Gb of bandwidth.
Requested Allocated
FlexNIC a 2Gb 2Gb
FlexNIC b 2Gb 2Gb
FlexNIC c 2Gb 2Gb
FlexNIC d 2Gb 2Gb
2. After bandwidth is allocated in rule 1 above, FlexNICs with an "Auto" value for the requested
bandwidth divide the remaining bandwidth evenly . For example, if the requested bandwidth setting
for the four FlexNICs on a given port are 1Gb, Auto, Auto, and Auto, then the first FlexNIC is
assigned 1Gb (as per rule 1) and the other three FlexNICs divide the remaining 9Gb evenly (3Gb
each). There might be some cases where the bandwidth does not divide evenly as Virtual Connect
assigns bandwidth in increments of 100Mb. Connections with a "preferred" setting to a network
where no preferred speed has been defined are treated as a connection set to "auto".
Requested Allocated
FlexNIC a 1Gb 1Gb
FlexNIC b Auto 3Gb
FlexNIC c Auto 3Gb
FlexNIC d Auto 3Gb
In cases where the requested bandwidth settings specified by the user for the four FlexNICs in a single
physical port exceed 10Gb, the following rules are applied in this order:
1. If FlexNICs with a "preferred" or "custom" value for requested bandwidth exceed 10Gb, each
FlexNIC is allocated bandwidth proportional to its requested bandwidth setting. For example, if four
FlexNICs on a given port have requested bandwidth settings of 1Gb, 2Gb, 4Gb, and 5Gb, their
allocated bandwidth is as shown in the table below. In this example, 200Mb remains after dividing
the 10Gb link. 100Mb is added to the two connections with the least bandwidth.
Requested Calculation Allocation + remainder
FlexNIC a 1Gb (1/12)*10Gb = 800Mb 900Mb