Hitachi 3100

Clustered NAS servers (external SMU)
In this configur
ation, the NAS is part of a cluster with an external SMU. In
this case, eth1 on each NAS and eth1 on the SMU are connected to the same
private management network and eth0 on each NAS is optionally connected
to the public management network.
Jumbo frames support
All file serving interfaces of a serv
er support jumbo frames. Jumbo frames
enable transmission of Ethernet frames with a payload larger than 1500
bytes and these frames co-exist with standard frames on an Ethernet
network.
All file serving interfaces receive jumbo frames unconditionally, without any
configuration changes. It is possible to configure a file serving interface to
transmit jumbo frames by specifying an MTU size of between 1,501 and
9,600 bytes.
To use jumbo frame transmission, configure the following settings:
• IP MTU for off-subnet transmits - bytes
• TCP MTU
• Other Protocol MTU
Caution: Networking equipment lacking the jumbo frames extension can
drop jumbo frames and record an oversize packet error. Before configuring
jumbo frame transmission, verify that all network equipment along the route
(and at each end point) supports jumbo frames. If you enable jumbo frames
and either network equipment or clients on the subnet do not support jumbo
frames, it is possible to experience a loss of communication with the server/
cluster.
Successful IP data transmission using jumbo frames depends on the
destination IP address or sub-network. The maximum MTU siz
e for a
24 Network interfaces
Hitachi NAS Platform Network Administration Guide