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Frequently Asked Questions About SunFDDI 137
A
• Why do I get the error message “duplicate address”or“duplicate
macid”?
By default, the first SunFDDI/P interface installed in the machine adopts
the host-resident MAC address stored on the motherboard. Each subsequent
SunFDDI/P interface takes the card-resident MAC address stored in its
IDPROM.
• Why is performance poor when I use NFS over FDDI?
For a single file transfer, the maximum data transfer rate is limited to
0.5 Mbytes/second when writing to an NFS mounted file system and
1.5 Mbytes/second when reading from an NFS mounted file system. This
performance limitation, which affects Ethernet, FDDI, and any other fast
network, is due to the NFS version 2 protocol. It will be removed by
NFS version 3.
• Note that when several NFS operations are performed in parallel (several
reads and writes in parallel), the aggregate throughput is much higher with
FDDI than it is with Ethernet.
6. How do I disable the SunFDDI/P interface?
Use ifconfig(1M) to disable the SunFDDI/P interface temporarily. It will
be reconfigured when you reboot your machine.
To disable the SunFDDI/P interface so that it is not reconfigured when you
reboot the machine, change the name of the /etc/hostname.pf<inst> file.
• How do I disable the Ethernet interface?
Use ifconfig(1M) to disable the Ethernet interface temporarily. It will be
reconfigured when you reboot your machine.
# ifconfig pf<inst> down
# mv /etc/hostname.pf<inst> /etc/oldhostname.pf<inst>
# ifconfig le<inst> down