prng.22c4d8 prng runs in TDES mode with chunksize=<read chunk size in bytes> and reseed_limit=<reseed limit>
Explanation
The pseudo-random number device driver started in triple DES mode.
For IBM mainframes earlier than IBM zEnterprise EC12 (zEC12),
triple DES is the only available mode.
As of zEC12, the preferred mode is SHA-512.
User response
If triple DES is the expected mode, no action is required.
Otherwise, verify that the prng started with the mode= module or
prng.mode= kernel parameter set to a value other than 1.
The value 1 forces triple DES mode. Also ensure that the mainframe
runs with the latest firmware level.