You must be aware that the upgrade process requires additional disk space. Ensure that you have enough free disk space to complete this process successfully. The following disk space recommendations are applicable for upgrading to DB2® Version 10.5.
Ensure that you have sufficient free space on the system catalog and the system temporary table spaces for the databases that you are upgrading. System catalog table space is required for both old and new database catalogs during upgrade. The amount of free space required varies, depending on the complexity of the database, as well as on the number and size of database objects.
For the system catalog table space, free pages should be equal to or greater than used pages. Total pages for the system temporary table space should be twice the amount of total pages for the system catalog table space.
To increase the amount of free space on your automatic storage table spaces, you can increase the space on the current storage paths or add a new storage path.
To increase the amount of free space on your System Managed Space (SMS) table spaces, free sufficient disk space on the corresponding file systems or increase the size of your file systems if you are using a volume manager.
To increase the amount of free space on your Database Managed Space (DMS) table spaces, you can increase the size of existing containers. You can also add additional containers although this might trigger data rebalancing. You can reduce the size of the containers after upgrade.
To ensure sufficient log file space is available, you can set the logsecond database configuration parameter to twice the current value of logprimary and logsecond if the file system containing the log files has enough disk free space to increase this parameter. If you already have available a large log file space, it might not be necessary to increase this parameter. Also on partitioned database environments, you only need to increase the log space in the catalog partition.
You must update these database configuration parameters values before you upgrade the instance to DB2 Version 10.5, because you will not be able to update these database configuration parameters until you issue the UPGRADE DATABASE command. If this command fails because there is insufficient log file space, then you can set these database configuration parameters to higher values and then re-issue the UPGRADE DATABASE command.
The new database configuration parameter settings for log space can be restored to their original value after the upgrade is complete.