IBM Tivoli Storage Manager for UNIX and Linux: Backup-Archive ...

|||||||||||||||||||||||||||||||||directory delimiter) or a relative path name. In the later case, the location of thejournal directory is formed by using the name of the file system being journaledand appending the relative path name.v PreserveDbOnExit - The PreserveDbOnExit setting can be used to allow journalsfor shared resources to remain valid when a resource moves to a different nodein the cluster.v DeferFsMonStart - The DeferFsMonStart should be set to 1 to causejournal-based backup to periodically (DeferRetryInterval) check for a file systemcoming online or going offline.v DeferRetryInterval - This controls how often the journal checks for a change infile system status.v logFsErrors - This is used to eliminate excessive ″File System unavailable″messages from being written to the log.The previously listed options can be set for all file systems being journaled. Then,if desired, you can override any given file system with a file system overridestanza.When the journal daemon is set up to monitor file systems as they go online andoffline, this is done in a periodic loop. The following actions occur during resourcefailover and fallback conditions:v nodeA and nodeB share a resource and nodeA has a failure and, therefore, afailover occursv nodeB will detect the shared resource and start monitoringv When nodeA takes the resource back (fallback), if nodeB has an open filedescriptor to the shared journal database, it will receive a SIGKILL interrupt.This interrupt cannot be caught or ignored.v nodeB must be informed of the resource fallback before the event, by removingthe shared file system names from the journal list of file systems to monitorcontained in the options file - tsmjbbd.ini. This can be done manually or it canbe automated by using HACMP start and stop scripts.Two sample perl scripts are provided with the journal: jbbadd.pl andjbbdelete.pl. The invocation of these scripts can be added toStartClusterTsmClient.sh and StopTsmClient.sh. The arguments for these scriptsare just the file system names of the shared resources.516 IBM Tivoli Storage Manager for UNIX and Linux: Backup-Archive Clients Installation and User’s Guide