Restrictions and limitations

OAM supports a maximum object size of 50 megabytes (52␠428␠800 bytes) unless a larger maximum object size, up to 2000 megabytes (2 097 152 000 bytes), has been defined using the MOS=nnnn parameter in the IEFSSNxx parmlib member. Refer to z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Object Support for more information on using the MOS=nnnn keyword to specify a maximum object size greater than 50 megabytes.

Note:

When storing an object greater than 50 MB, if multiple data buffers are supplied, however the data buffers are not in contiguous storage, the request fails with OSREQ return/reason code: Return Code=08 , Reason Code=2402080A or 2409080A
When retrieving an object greater than 50 MB, if the first data buffer supplied is not large enough to contain the requested or partial object, the request fails with OSREQ return/reason code: Return Code=08 , Reason Code = 2403080B

These buffer restrictions ensure that extra GETMAINs are not made in the user's (applications) address space. The minimum message area size is 244 bytes.