Considerations for IBM Storage Protect for Space Management

Upgrading to GPFS 3.3 or beyond requires consideration for IBM Storage Protect for Space Management. IBM Storage Protect for Space Management requires that all nodes in a cluster are configured with a DMAPI file handle size of 32 bytes.

During upgrade, it is possible to have older versions of GPFS that have a DMAPI file handle size of 16 bytes. Until all nodes in the cluster are updated to the latest release and the DMAPI file handle size is changed to 32 bytes, IBM Storage Protect for Space Management must be disabled. Run mmlsconfig dmapiFileHandleSize to see what value is set.

After all nodes in the cluster are upgraded to the latest release and you change the DMAPI file handle size to 32 bytes, you can enable IBM Storage Protect for Space Management.

The DMAPI file handle size is configured with the dmapiFileHandleSize option. For more information about this option, see GPFS configuration attributes for DMAPI.