The z/OS® Media server made an attempt to EXTEND the VSAM LDS FILE volume using the SECONDARYALLOCATION value from the FILE device class and failed.
The WRITE operation fails and the FILE volume is marked "read-only".
Allow TSM for z/OS Media server to create EA-enabled VSAM linear data set volumes. 1. Use SMS to manage the VSAM Linear data sets that are associated with the prefix attribute of the FILE device class. 2. Associate the data sets with a data class (an SMS construct) that specifies the extended format and extended addressability options. To make this association between data sets and the data class, use an automatic class selection (ACS) routine to assign the TSM for z/OS Meida VSAM linear data sets to the relevant SMS data class. The ACS routine does the assignment based on the data set name.