HP Storage Essentials V5.1 Installation Guide Second Edition (Linux Release) (T4283-96055, November 2006)

Troubleshooting328
Link Between a Brocade Switch and a Host
Disappears from the Topology
If a link that used to work between a Brocade switch and a host disappears from the topology, you
may need to rediscover the Brocade switch and the host. Also, confirm that both are online and
there are no network connection issues. As a last resort, you may need to reboot the switch. In some
instances, the API of the Brocade switch has been known to hang. Rebooting the switch clears the
switch of the API hang.
Incorrect Topology Sometimes Displayed for CNT Switches
The CNT SMI-S provider for CNT switches does not return the correct topology information when
more than one fabric is managed by the same InVSN™ Storage Network Manager. McDATA,
which completed its acquisition of CNT in the summer of 2005, has been made aware of this issue.
Unable to Find Elements on the Network
NOTE: This section only applies to Discovery from SE.
The management server uses ping to find the devices on the network enabled for IP. Ping is a
program that lets you verify that a particular IP address exists. Ping is not guaranteed to return a
response from all devices. If Discovery is not able to find a device automatically, enter the IP address
for the device on the Discovery Targets tab, which can be accessed by clicking the Discovery button
at the top of the screen in the management server. Sometimes ping cannot find the device if one of
the following conditions occur:
• Network configuration does not support ping, including data center security (firewalls).
• Device has the ping responder turned off.
• Device does not support ping.
Device Locking Mechanism for Brocade Element
Manager Query/Reconfiguration
Please keep in mind that the configuration for Brocade switches is locked while getting all details for
elements in a zones. The software ensures that each CIM query locks out any reconfiguration. For
example, if you are getting details for elements in all zones, you cannot add a new Brocade switch
while you are doing it (the discovery or configuration process waits until the collection of details is
finished before proceeding). However, simultaneous CIM queries do not lock each other out.
A Discovered Sun StorEdge A5000 JBOD Does
Not Display Its WWN Properly
Although full monitoring and management support is available only to those devices for which there
is a provider, the software's topology displays other devices found on your storage area network
(SAN) to give you a more complete view. However, because these devices do not have a provider,
only basic information is returned. In some cases, as with the Sun StorEdge A5000 JBOD (Just a
Bunch of Disks), the Worldwide Name (WWN) presented and reported to the management server