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Trying to set a DASD root device online can fail under some circumstances with the message "Read configuration data returned error -5". The cause is that read configuration data incorrectly aborts with -EIO when it encounters a temporary busy condition at a storage server. Perform retry when encountering temporary busy conditions. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>