Check the system log for error message IGW020I, which will
look something like this:
IGW020I HFS DATA SET dsname HAS BEEN MOUNTED R/W ON ANOTHER SYSTEM:
sysname. FILE SYSTEM OPERATIONS ARE DISABLED UNTIL MOUNT
The callable service BPX1LOD failed while attempting to load a
module-name from the HFS. The system return and reason codes were
returned.
Reason Code 5B4B000D - HFS_RSN_SYNC_WRITE_PROTECT_ERROR 0Dx
The Write_Protect field in the first VDF page on disk doesn't match the
RFS field that was completed mount time.
Contact your system administrator to verify that the HFS is not mounted as
R/W on another system.
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