Brocade Network Advisor SAN User Manual v12.3.0 User Manual
Page 1118
1066
Brocade Network Advisor SAN User Manual
53-1003154-01
FCIP troubleshooting
27
IP Performance sends dummy data as fast as possible to the remote IP address and measures
how much data can be sent over a given interval. IP Performance attempts to saturate the
network link to see how much bandwidth is available. It will display the media link bandwidth
only if no other traffic is flowing. The remote IP address must belong to a managed switch so
that IP Performance can set up the receiving end on the remote switch.
For more information about IP Performance, refer to Chapter 20 in the Fabric OS
Administrator’s Guide.
During the IP Performance test, data is sent continuously and statistics are sampled every 30
seconds. At the end of the period, the IP Performance results dialog box displays. The IP
Performance results dialog contains a table with one row for each 30-second sample of the
test. Columns in the perf results dialog are:
7. Click Close on the IP Performance Result dialog box.
8. Click Cancel on the IP Performance dialog box.
Field/Component
Description
Available Bandwidth
The average bytes per second sent during the sample interval. This is a count of FC
payload bytes; for example, the throughput seen by an FC application. It is slightly
lower than the actual bytes-per-second on the wire since it does not include
headers and acknowledgements.
Weighted Bandwidth
The weighted bandwidth represents what the FCIP tunnel / FC application sees for
throughput rather than the Ethernet on-the-wire bytes.
Loss Percent
An estimate of the percentage of data packets lost during the sampling interval,
based on TCP re-transmits.
DELAY
The average round trip time to send a packet of data and receive the
acknowledgement.
PMTU
(Path Maximum
Transmission Unit)
The largest packet size that can be transmitted over the end path without
fragmentation. This value is measured in bytes and includes the IP header and
payload. IP Performance tries the configured Fabric OS Jumbo MTU value (anything
over 15000, then 1500, then 1260. The value displayed in the table is the largest
value that worked.