If you want to create a physical copy of an encrypted image copy (so that the output copy is encrypted with the same encryption key as the input copy), the CIC function can bypass the decryption and encryption processes to save time and resources. If a single job step creates an Instant Snapshot copy and a traditional image copy through the CIC function, the secondary copy (copy 2) can be encrypted. For more information, see DBRC considerations for the CIC function. The function also considers DBRC notification in determining whether to encrypt the output copy. The function can encrypt the output image copy data set if encryption is specified in the dynamic allocation model that is used to allocate the output data set. The function automatically detects that an input copy is encrypted. The CIC function can read and write encrypted image copy data sets. Reading and writing encrypted image copy data sets If DBRC is not active for the function and the input data set is an Instant Snapshot copy, you must specify the DUMPTYPE(I) keyword on the CIC or ACIC statement to identify that the input is an Instant Snapshot copy. The CIC function uses DBRC to determine the type of the input data set. However, if the function is producing an Instant Snapshot copy (the DSSNAP keyword is specified on the IC, AIC, OIC, or AOIC control statement), you can use the CIC function (by including a CIC or ACIC statement) in the same job step for the same data set group or area to produce one or more traditional image copies with the Instant Snapshot copy. Usually you cannot use the CIC function in the same job step with other utility functions that process the same data set group or area. Generally, the Image Copy utility cannot process the same data set group or area more than once in the same job step. If the input to the CIC function is an Instant Snapshot copy, the output data set is a traditional image copy. Read an image copy and write it to a stacked tape that contains other image copies, or read an image copy from a stacked tape and write it to an unstacked tape or to DASD\Ĭreating traditional copies from Instant Snapshot copies Read a compressed image copy and write an uncompressed image copy, or read a compressed image copy and write a compressed image copy that uses different compression characteristics Read an encrypted image copy and write an image copy that is not encrypted, or read an image copy that is not encrypted and write an encrypted image copy Read an Instant Snapshot copy and write a traditional image copy (which can be compressed or encrypted) To transform the input copy into a different format, such as in the following examples: To replace an existing copy with an identical copy, such as a copy that might be required for an image copy data set that has been flagged as in error To create additional output copies of the input data set, such as to send offsite or to use for testing You can use the CIC function for the following purposes: The following figure shows the processing flow of the CIC function. The timestamp on the output data set is the same as the timestamp on the original data set. The CIC function reads an input image copy data set and creates one or more output copies of that data set. These topics provide information about the Copy Image Copy (CIC) function.
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