Adaptive quiesce for efficient cross-host consistent CDP checkpoints
First Claim
1. A method for generating cross-host consistent checkpoints, for use in disaster recovery systems, comprising:
- transmitting, at a first time, a write quiesce command to a plurality of enterprise host computers, the write quiesce command including a timeout period, wherein the plurality of enterprise host computers are operative to write enterprise data to source datastores;
determining whether acknowledgements have been received from each of the plurality of enterprise host computers within the timeout period, the acknowledgments indicating that an enterprise host computer of the plurality of enterprise host computers has successfully stopped writing enterprise data to the source datastores;
adjusting the timeout period for the write quiesce command;
transmitting at a second time, the write quiesce command with the adjusted timeout period; and
generating a target datastore, by a continuous data protection disaster recovery system to replicate the enterprise data in the source datastores.
4 Assignments
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Accused Products
Abstract
A disaster recovery system, including a target datastore for replicating data written to source datastores, and a checkpoint engine (i) for transmitting, at multiple times, quiesce commands to a plurality of host computers, each quiesce command including a timeout period that is adjusted at each of the multiple times, (ii) for determining, at each of the multiple times, whether acknowledgements indicating that a host has successfully stopped writing enterprise data to the source datastores, have been received from each of the host computers within the timeout period, (iii) for marking, at each of the multiple times, a cross-host checkpoint in the target datastore and reducing the timeout period for the quiesce commands at the next time, if the determining is affirmative, and (iv) for increasing, at each of the multiple times, the timeout period for the quiesce commands transmitted at the next time, if the determining is not affirmative.
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Citations
20 Claims
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1. A method for generating cross-host consistent checkpoints, for use in disaster recovery systems, comprising:
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transmitting, at a first time, a write quiesce command to a plurality of enterprise host computers, the write quiesce command including a timeout period, wherein the plurality of enterprise host computers are operative to write enterprise data to source datastores; determining whether acknowledgements have been received from each of the plurality of enterprise host computers within the timeout period, the acknowledgments indicating that an enterprise host computer of the plurality of enterprise host computers has successfully stopped writing enterprise data to the source datastores; adjusting the timeout period for the write quiesce command; transmitting at a second time, the write quiesce command with the adjusted timeout period; and generating a target datastore, by a continuous data protection disaster recovery system to replicate the enterprise data in the source datastores. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A disaster recovery system for providing continuous data protection to an enterprise, the enterprise comprising a plurality of host computers that are operative to read enterprise data from source datastores and write enterprise data to source datastores, comprising:
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a target datastore for replicating data written to the source datastores; and a checkpoint engine (i) transmitting, at a first time, a write quiesce command to a plurality of enterprise host computers, each write quiesce command including a timeout period that is adjusted, (ii) for determining whether acknowledgements have been received from each of the plurality of enterprise host computers within the timeout period, the acknowledgements indicating that an enterprise host computer of the plurality of enterprise host computers has successfully stopped writing enterprise data to the source datastores, (iii) for adjusting the timeout period for the write quiesce command; and
(iv) for transmitting at a second time, the write quiesce command with the adjusted timeout period. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification