3Com EtherLink 3C985B-SX, Руководство пользователя

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38 C
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A Packet Receive Buffer is equal to the MAXIMUM
PHYSICAL RECEIVE PACKET SIZE. To calculate the
minimum and maximum memory consumed by the
receive buffers, multiply the number of buffers by the
maximum physical receive packet size. For example, if
the MAXIMUM PHYSICAL RECEIVE PACKET SIZE = 4202
(bytes), then the minimum memory usage is 4202
bytes x 2024 buffers = 8.1 MB of RAM. The maximum
memory usage is 4202 bytes x 3524 buffers = 14.1 MB
of RAM.
■
Slot numbers for multiple NICs — If you are installing
more than one NIC on a server, you must know which
NIC corresponds to a given PCI slot to connect a cable
from the NIC to the appropriate port on the hub or
switch. You can correlate slots with physical NICs by the
NIC MAC addresses. (The MAC address is written on a
bar code label on the top component side of the NIC.)
See
Obtaining Slot Numbers for more information.
Planning NIC Groups
■
Plan the cable changes required to connect each
primary NIC and all secondary NICs to the same
network segment.
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For optimum failover performance, turn the spanning
tree feature off at switches that are connected directly
to the server. If the spanning tree feature must be
turned on, a failover may be delayed up to 30 seconds
while the switch processes the spanning tree algorithm.
■
Decide which NICs are to be part of each Load
Balancing/RSL group.
■
Decide which NIC is to be the primary NIC in each group.
■
Obtain the slot numbers of the NICs. You need these
numbers if you are installing more than one NIC. See
Obtaining Slot Numbers for instructions.
Book Page 38 Monday, June 7, 1999 2:14 PM