IBM 26R0881, Installation And User Manual

Page: 62 / 78

Session and credentials
The AMM displays an error page when another user attempts to login with the
same credentials.
For most of the OFM operations, the AMM needs to interact with other chassis. By
default, it will use the user name and password that you used to login to the
current AMM. If the AMM cannot login to other chassis, it will prompt you to
provide an alternative user name and password. The alternative user name and
password are stored for the local session and are not cleared until you log out.
Thus, while you are using OFM, another user cannot. If another user tries to open
the OFM page while it is in use by you, the Web interface displays an Open Fabric
Manager is in Use By Another Session page. If the new user clicks Continue , the
your operation will be aborted.
Note: This page is displayed only in the case where a new user starts OFM while
you have started a OFM operation but did not complete it. If you complete
your last operation, this page is not displayed and the credentials are
cleared automatically.
Standby AMM
Because an AMM failure results in a configuration loss, IBM recommends that you
install a Standby AMM when using OFM.
The OFM configuration is not included in the AMM configuration backup. Such a
backup would allow OFM configuration updates from a file that might be
outdated and would cause inconsistencies with the configuration of other chassis.
The OFM configuration is chassis-based and will not transfer with the physical
AMM. When an AMM is moved to a new chassis, it clears out its OFM
configuration, and the OFM configuration must be reapplied on the new AMM.
Note: When an AMM is moved to a new chassis, it will clear the configuration for
all slots except for slots that have blades powered-on with a valid OFM
configuration that is already in use. For these slots, the AMM will use the
OFM configuration as defined on the blades.
If the AMM configuration is reset to factory defaults, the OFM configuration is
handled as if a new AMM was inserted to the chassis.
If the primary AMM fails, the standby AMM will contain the OFM configuration
and will take over. As an additional precaution, you should always save your OFM
configuration file or files via the OFM interface whenever changes are made or a
new configuration is applied.
If you only have one AMM installed in the chassis and must replace it, before you
do the replacement, insert the new AMM as a standby unit, let it power on and
wait for a few minutes. This will allow the OFM configuration to be transferred to
the new unit. The old unit can then be removed and you will not have to reapply
the OFM configuration.
Note: You might have to wait longer than a few minutes if the AMM you insert in
the standby slot does not have the same firmware level as the primary.
50
IBM BladeCenter Open Fabric Manager Installation and User's Guide