Many times sites want to copy files to be used in recovery and have routinely used DFDSS to store a copy of the Security File.
This is fairly simple with a BDAM file because it is a sequential file. With the addition of the VSAM companion file, using DFDSS no longer works because DFDSS cannot copy a VSAM file and this causes a roadblock.
In VSAM there is a command called REPRO that copies a VSAM file into a Sequential file.
It will also change the sequential file back to its original VSAM file.