Cluster families for cluster selection and cooperative replication
First Claim
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1. A method for cooperative replication of multiple clusters, the method comprising:
- arranging at least one subset of the multiple clusters into family members of a cluster family;
negotiating between cluster family members to determine which cluster family member is in the best position to obtain at least one outside data object from an outside cluster, the outside cluster being apart from the cluster family;
selecting one family member of the cluster family to obtain the outside data object; and
sharing the outside data objects among the cluster family so that each cluster within the cluster family is consistent with respect to outside data objects;
wherein a first family member to replicate 1/Nth volumes informs the outside cluster that the first family member will maintain the volumes for the cluster family members and relieves the outside cluster from maintaining the volumes in a cache of the outside cluster.
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Abstract
Cluster families for cluster selection and cooperative replication are created. The clusters are grouped into family members of a cluster family base on their relationships and roles. Members of the cluster family determine which family member is in the best position to obtain replicated information and become cumulatively consistent within their cluster family. Once the cluster family becomes cumulatively consistent, the data is shared within the cluster family so that all copies within the cluster family are consistent.
30 Citations
18 Claims
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1. A method for cooperative replication of multiple clusters, the method comprising:
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arranging at least one subset of the multiple clusters into family members of a cluster family; negotiating between cluster family members to determine which cluster family member is in the best position to obtain at least one outside data object from an outside cluster, the outside cluster being apart from the cluster family; selecting one family member of the cluster family to obtain the outside data object; and sharing the outside data objects among the cluster family so that each cluster within the cluster family is consistent with respect to outside data objects; wherein a first family member to replicate 1/Nth volumes informs the outside cluster that the first family member will maintain the volumes for the cluster family members and relieves the outside cluster from maintaining the volumes in a cache of the outside cluster. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for cooperative replication of multiple clusters, the system comprising:
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a network; a plurality of sites in communication over the network, each site comprising at least one host and a storage system comprising a plurality of clusters, each cluster comprising at least one tape drive configured to access volumes stored on magnetic tape, at least one tape volume cache, and a cluster manager configured to execute computer readable programs using a processor and a memory, wherein the computer readable programs; arrange at least one subset of the multiple clusters into family members of a cluster family; negotiate between cluster family members to determine which cluster family member is in the best position to obtain at least one outside data object an outside cluster, the outside cluster being apart the cluster family; select one family member of the cluster family to obtain the outside data object; and share the outside data objects among the cluster family so that each cluster within the cluster family is consistent with respect to outside data objects; wherein a first family member to replicate 1/Nth volumes informs the outside cluster that the first family member will maintain the volumes for the cluster family members and relieves the outside cluster from maintaining the volumes in a cache of the outside cluster. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A computer program product comprising a non-transitory computer readable medium including a computer readable program, wherein the computer readable program when executed on a computer causes the computer to:
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arrange at least one subset of the multiple clusters into family members of a cluster family; negotiate between cluster family members to determine which cluster family member is in the best position to obtain at least one outside data object from an outside cluster, the outside cluster being apart from the cluster family; select one family member of the cluster family to obtain the outside data object; and share the outside data objects among the cluster family so that each cluster within the cluster family is consistent with respect to outside data objects; wherein a first family member to replicate 1/Nth volumes informs the outside cluster that the first family member will maintain the volumes for the cluster family members and relieves the outside cluster from maintaining the volumes in a cache of the outside cluster. - View Dependent Claims (16, 17, 18)
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Specification