Space ABEND generally occurs when your system encounters the end of volume condition occurs. There are three types of Space ABEND as mentioned below.
The SPACE parameter specifies the primary and secondary allocation. A space request like (CYL,(100,100)) means the system would try to allocate 100 cylinders of primary space. The secondary space is the overflow size. That is if the dataset becomes full, system routines extend the dataset by another 100 cylinders of secondary space. For the non-VSAM dataset, the system allows up to 16 extents of a file per disk volume. Theoretically, you can therefore have a file size of 1 primary extent and up to 15 secondary extents. For a space request like (CYL,(100,100)), this translates to a maximum size of 100 cylinders + 15 x 100 cylinders = 1600 cylinders of space.
Give primary and secondary allocations: While allocating your dataset give primary and secondary allocations in space specification provided that there are enough DASD units for secondary space allocation, it is important also to maintain some sort of a reasonable balance between primary and secondary space requests. While there are no universal rules for determining what balance is “right”, there is a “rule of a thumb” that works reasonably well in most cases.
Allocate the same dataset with a different name: It is always nice to create another dataset with the same DCB parameters. Give space parameters so that you can your dataset can fit in. You can just go to your JCL and change DD name to a new one. If you want to allocate with the same name then delete the existing one and reallocate.
Use data class Compress: You can prevent the dataset to exceed space by using the data class COMPRESS. This data class can be used for only DASD files, It won’t work with the TAPE files in the systems. It is very simple to use just add the statement DATACLAS=COMPRESS in your dataset parameter list separately.
Use Dataset name type Large: In order to accommodate huge volume datasets in Large format, PS files were introduced in z/OS 1.7 . They can allocate space beyond 65535 tracks per volume. A large dataset type is available for PS datasets. Generally, they are used for storing large format datasets.
Command to compress the PDS: In case if you are editing a member is PDS and you are not able to save it due to space issues then you can just open a new ISPF window. Go to option 3.4 browse. Put the PDS name and hit enter. Once the PDS name gets listed then put a command ‘Z’ against it. The dataset will be compressed.
TMSFORMT Expand utility: This utility can be used in order to move the dataset to a new volume and allocate new space parameters for the same.
TAPE datasets instead of DASD: This is one of the preventive techniques you can use for allocating the large dataset. You can use the TAPEs for storing the datasets instead of DASD. If you don’t need tape then use GDGs for storing large datasets.
If you are in an edit session, you are not able to leave the session until you deal with the problem. Some of the things you can do are:
Note: Some installations use Space Manager to increase space for a data set. By issuing a command, they can automatically increase the data set’s space & avoid Space Abend.
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