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Chapter 1 Troubleshooting Overview 1-17
These are the result of an ICMP message from another router or firewall, typically
due to mis-configuration of that device. It is also possible to configure StorEdge to
ignore ICMP requests to change the default gateway.
■ Check the “Use” statistic in the routing table. This statistic indicates how many
times a route has been used. If you have defined a route for a specific purpose,
such as mirroring, and this counter is not incrementing, then the route was most
likely not defined correctly.
Also, check the basics. Try another client on the same subnet, try another cable, try
another switch port for both client and StorEdge.
To escalate TCP/IP connectivity issues collect a network trace from the StorEdge,
using the internal utility, and also from the client or server attempting to connect to
the StorEdge if possible. Also include details on the client system, especially network
configuration information and operating system version. A network diagram which
includes IP addresses and information on switches and router hardware on the
network is also very helpful.
1.6.2.10 Performance Issues
The following is a general list of barriers to peak performance:
Network Configuration:
■ Verify speed and duplex negotiation.
■ Verify that port aggregation is configured when multiple NICs are connected to a
subnet.
■ Ensure that Jumbo frames are not configured.
■ Ensure that Spanning Tree Protocol is not configured.
■ Ensure that all configured NIS, DNS, SMTP servers and etc. are reachable and
resolvable. (Note: always configure by IP rather than name where possible)
Configuration:
Checkpoints: Checkpoints can be overused and have a drastic effect of performance
of the system. Verify that customers understand the use of checkpoints and how the
retention policy can play a significant role in system performance.
If using ADS, improper configuration of dynamic DNS configuration can adversely
affect performance.