An ICF catalog is made up of two components:
The normal mode of operation for a delete is to remove the cluster's definition from both components. Occasionally, however, this is not possible. If the BCS and VVDS are on different volumes and the volume with the VVDS is destroyed, the BCS will still have pointers to the VVDS that is now destroyed. When this occurs (assuming you do not have a copy of the VVDS that can be recovered), it is necessary to delete the cluster entries from the BCS with the noscratch option prior to restoring the VSAM clusters. This tells catalog management to remove the entry from the BCS without trying to delete it from the VVDS. This can be done with IDCAMS, or can automatically be invoked by CA Disk by specifying sysparm VSNOSCRO with a value of Y.
With this parameter specified as a Y (the default value is N), CA Disk will reattempt any delete that fails with a VVDS error (during a normal cluster recovery operation) with the noscratch option. Note that the noscratch option will only be attempted if the normal delete fails.
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