Essential metadata replication
First Claim
1. A method, comprising:
- receiving, by a storage system, a storage request;
identifying, based on the storage request, one or more storage management units;
identifying, for each of the storage management units, one or more master partition tables having multiple master entries and one or more backup partition tables, each of the backup partition tables having backup entries in a one-to-one-correspondence with the master entries;
performing the storage request;
upon performing the storage request, identifying any changes to essential metadata in the one or more master partition tables;
storing the identified changes to the essential metadata in the one or more backup partition tables; and
upon detecting a failure in master partition table, configuring one of the backup partition tables as a replacement master partition table, calculating, using the essential metadata in the replacement master partition table, non-essential metadata, and storing the calculated non-essential metadata to the replacement master partition table.
1 Assignment
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Accused Products
Abstract
Methods, apparatus and computer program products implement embodiments of the present invention that include defining, in a storage system including receiving, by a storage system, a storage request, and identifying, based on the storage request, one or more storage management units. For each of the storage management units, a master partition table having multiple master entries and one or more backup partition tables is identified, each of the backup partition tables having backup entries in a one-to-one-correspondence with the master entries. The storage request is performed, and upon the storage request being performed, any changes to essential metadata in the one or more master partition tables are identified, and the identified changes are stored to the essential metadata in the one or more backup partition tables.
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Citations
17 Claims
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1. A method, comprising:
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receiving, by a storage system, a storage request; identifying, based on the storage request, one or more storage management units; identifying, for each of the storage management units, one or more master partition tables having multiple master entries and one or more backup partition tables, each of the backup partition tables having backup entries in a one-to-one-correspondence with the master entries; performing the storage request; upon performing the storage request, identifying any changes to essential metadata in the one or more master partition tables; storing the identified changes to the essential metadata in the one or more backup partition tables; and upon detecting a failure in master partition table, configuring one of the backup partition tables as a replacement master partition table, calculating, using the essential metadata in the replacement master partition table, non-essential metadata, and storing the calculated non-essential metadata to the replacement master partition table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A storage system, comprising:
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a memory configured to store one or more master partition tables and one or more backup partition tables; and a processor configured to receive a storage request, to identify, based on the storage request, one or more storage management units, to identify, for each of the storage management units, one of the master partition tables having multiple master entries and the one or more backup partition tables, each of the backup partition tables having backup entries in a one-to-one-correspondence with the master entries, to perform the storage request, to identify, upon performing the storage request, any changes to essential metadata in the one or more master partition tables, and to store the identified changes to the essential metadata in the one or more backup partition tables;
wherein upon detecting a failure in master partition table, the processor is configured to configure one of the backup partition tables as a replacement master partition table by calculating, using the essential metadata in the replacement master partition table, non-essential metadata, and storing the calculated non-essential metadata to the replacement master partition table. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A computer program product, the computer program product comprising:
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a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising; computer readable program code configured to identify, based on the storage request, one or more storage management units; computer readable program code configured to identify, for each of the storage management units, one or more master partition tables having multiple master entries and one or more backup partition tables, each of the backup partition tables having backup entries in a one-to-one-correspondence with the master entries; computer readable program code configured to perform the storage request; computer readable program code configured upon performing the storage request, to identify any changes to essential metadata in the one or more master partition tables; computer readable program code configured to store the identified changes to the essential metadata in the one or more backup partition tables; and computer readable program code configured to configure, upon detecting a failure in master partition table, one of the backup partition tables as a replacement master partition table, to calculate, using the essential metadata in the replacement master partition table, non-essential metadata, and to store the calculated non-essential metadata to the replacement master partition table.
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Specification