| 摘要 |
In one embodiment a method for providing recoverability to a system includes: protecting a critical PDSE by creating a copy of the critical PDSE, providing a CDR task with exclusive access to the PDSE copy, initiating a transaction queue for tracking updates to the critical PDSE, adding any updates performed to the critical PDSE to the transaction queue, updating the PDSE copy according to the transaction queue, quiescing the critical PDSE, corralling open connections to the critical PDSE, completing each update resident in the transaction queue to the PDSE copy up to a last known uncorrupted state of the critical PDSE, providing a replacement critical PDSE by redirecting the corralled connections to the PDSE copy, protecting the replacement critical PDSE by creating a copy of the replacement critical PDSE, referred to as a replacement PDSE copy, and providing the CDR task with exclusive access to the replacement PDSE copy.
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