Extending IOVF and SDEP storage portions if an out-of-space condition occurs
If an out-of-space condition occurs in IOVF or SDEP, you can use the Fast Path Online Reorg/EP patented Extend feature to extend the IOVF or SDEP portions of a DEDB. The ability to extend the IOVF or SDEP portions of the area can save time and resources in comparison to using offline CHANGE or UNLOAD/RELOAD commands.
If you use the Extend feature with an online reorganization and the area is registered with Virtual Storage Option (VSO), the IMS VUNLOAD command must be issued before executing the reorganization.
Depending on how many IOVF or SDEP portions that you request, the number of control intervals (CIs) that are required to accommodate your request is rounded up to the next control area (CA) boundary. If additional CIs must be added as a result of the rounding, the additional CIs are added to the SDEP portion of the database.
IOVF can be extended online when there are SDEPs defined. However, the minimum number of blocks that are being added must be as large as the number of SDEP blocks that are currently in use. The number of SDEP blocks that are in use can be reduced by executing the SDEP Scan/Delete utilities before executing the Extend function.
If you are extending IOVF, and the SDEP portion of the area is in a wrapped condition, the SDEP blocks will be rearranged to unwrap the SDEP portion.
If you are extending SDEP only, and the SDEP portion of the area is in a wrapped condition, the SDEP blocks will not be unwrapped. The existing SDEP blocks are rearranged so that the newly created SDEP blocks fall between the SDEP Logical End (LE) and SDEP Logical Begin (LB) points. As a result, the new blocks are immediately available for use; there is no need to run the SDEP Scan/Delete utilities. This action occurs only if the number of new SDEP blocks exceeds the number of used SDEP blocks between the LB point and the original end of file.
The following sections present step-by-step procedures for using the EXTEND command to extend IOVF or SDEP.
- Extending IOVF if an out-of-space condition occurs
- Extending SDEP in control intervals (CI), units of work(UOW), or cylinders