IBM 26R0881 User Guide - Page 62

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 Such a backup would allow OFM configuration updates from a file that might be outdated and would cause inconsistencies with the configuration of other chassis.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