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Read unit address is done for all devices during online processing to read out LCU features. This is also done after disconnect/connect a LCU. Some older storage hardware does not provide the capability to read unit address configuration. This leads to a loop trying to read unit address configuration every 30 seconds. The device is still operational but logs are flooded with error messages. Fix the loop by recognizing a command reject saying that the suborder for ruac is not supported. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>