How to configure so that RINGCHECK is not done for R/O mounts.

Document ID : KB000026249
Last Modified Date : 14/02/2018
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Environment: 

At our DR site when a R/O mount for a tape comes up, we have to flip the write switch. Then when the tapes are taken back into the Data Center, we have to flip the switch again.

 

Solution:

Many years ago when the IBM GIVE process was starting to be used, it provided a means to allow the write ring to no longer be changed to protect a tape from being written over on a R/O mount.

Add the following records to your VMTAPE CONFIG file:

    RINGCHK OFF 
    GIVE READONLY 

The GIVE READONLY turns the I/O over to CP. This means that even if someone calls for a R/O tape mount and then tries to write to it, CP will stop the I/O. This implementation/configuration is especially useful for those with silo or virtual drives.