Before the configuration is started, the TOD clocks on each system must be synchronized with a single time source. Because this synchronization is externally performed and subject to error, the initialization parameter SYNCTOL is provided to specify the maximum error (in seconds) which CA Spool must assume. If the synchronization error is greater than SYNCTOL, then CA Spool is not able to detect certain illegal operator actions. This includes, for example, performing a cold start with other systems active. Equally, certain legal operator actions (for example, a warm start after system failure) might be disallowed if attempted before SYNCTOL seconds have elapsed since system failure.
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