Determine whether your network is configured optimally for use of Luna appliances.
Bandwidth and Latency Recommendation:
Bandwidth
Network Latency
About Latency and Testing
Luna appliance client-server communication uses timeouts less than 30 seconds to determine failure scenarios. Thus the appliance does not tolerate network configurations or conditions that introduce a greater delay - problems can result, especially with HA configurations.
Here is a description of one common cause of such a situation, and what you can do about it.
When you disconnect the network cable between any Luna appliance and a switch, and then reconnect, traffic should resume immediately, but with certain network switch configurations it might take 30 seconds for traffic to resume.
The problem here is at the switch (and not the Luna appliance). See http://www.cisco.com/warp/public/473/12.html#bkg for some descriptions of Cisco switches. If the switch is configured to run the Spanning Tree Protocol on the port (which appears to be the default configuration, at least for Cisco switches), then there is a delay of about 30 seconds while it runs through a series of discovery commands and waits for responses. The switches can be configured to run in “PortFast” mode which skips running the Spanning Tree Protocol and starts the traffic flowing immediately.
With the switch introducing a connection detection delay of 30 seconds or greater, transient network failures lasting only seconds are no longer tolerated. A simple test is to set up a ping stream and then disconnect and reconnect the network cable. The ping traffic should resume after a 1 or 2 second delay. A greater delay indicates that a switch in the network is not detecting the reconnection as quickly as is optimal. See the recommendations for network Bandwidth and Latency.
Go to "Prepare to Configure Appliance Network Settings".