Blue Arc Titan SiliconServer, Руководство системного администратора

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Titan Networking Overview and Concepts
System Administration Manual 63
Jumbo Frames
Jumbo frames allow transmissions of MAC frames of a size greater than the Ethernet standard
of 1,518 bytes. Networking equipment lacking this extension simply drop any jumbo frames
received and record an oversize packet error. The use of Jumbo frames allows increased transfer
rates by reducing the number of MAC frames required for large transfers.
Jumbo frames co-exist with standard frames on an Ethernet network. To use jumbo frames,
correctly configured equipment between the end-points supporting jumbo frames must be
provided. The configured equipment offers a MTU maximum of 9000 bytes.
All the GE interfaces of a Titan SiliconServer support jumbo frames.
• Jumbo frames are received unconditionally on all GE interfaces without any
configuration changes.
• Jumbo frames can be transmitted by a GE interface by configuring its MTU size to a
value less than or equal to 9000.
IP data transmission using jumbo frames depends on the destination IP address or sub-
network. The maximum MTU size for a destination IP address or sub-network is configured as
an attribute in the IP routing table.
IP Address Assignments
IP addresses are assigned to Titan for three different purposes:
• File services . Network clients access Titan’s File Services through Titan’s configured file
service IP addresses. File services are only accessible through the GE ports. Multiple IP
addresses can be assigned for file services. The IP addresses assigned may be on the
same or different networks, but must be unique.
• Administration Services . These IP addresses are used when managing Titan , through
Web Administration Manager or using Titan’s embedded management interfaces. Titan
requires at least one IP address, which is assigned to the 10/100 Ethernet port
connected to the
private management network . Additional IP addresses can be assigned
to GE ports, so that management functions (such as telnet or SSC) may be performed
directly on these network ports.
Note: When configuring an Administration Services IP address for use on
the private management network, verify that its subnet mask matches that
of the SMU's private management network (eth1) i.e. 255.255.255.0. Also,
choose an IP address that resides within the management network's range
e.g. 192.0.2.2-254. This should be the same IP address that is used when
configuring Titan as the managed server on the SMU.
• Clustering . When configured as a cluster , each Titan needs an IP address for the 10/
100 management port connected to the private management network. This is used for
communication between Cluster Nodes and between the Cluster Nodes and Quorum
Device (QD).
At least two IP addresses are required to configure Titan for access through the public network.