Reclaiming free space in a storage system
First Claim
1. A method for reclaiming free space in a storage system, comprising:
- selecting a first blob for reclamation from a first data center;
sending a first message to a second data center indicating the first blob is to be reclaimed;
reclaiming the first blob from the first data center;
sending a second message to the second data center after reclaiming the first blob; and
receiving a global reclamation complete message from the second data center;
wherein;
the global reclamation complete message indicates a second blob in the second data center has been reclaimed;
the second blob comprising data associated with data in the first blob;
the storage system comprises a plurality of data centers;
each data center maintains a local erasure code and a map of data stored locally therein; and
the plurality of data centers is protected by a global erasure code distributed across all blobs across all data centers.
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Accused Products
Abstract
One embodiment provides a method for reclaiming free space. The method comprises selecting a first blob for reclamation from a first data center; sending a first message to a second data center indicating the first blob is to be reclaimed; sending a second message to the second data center after reclaiming the first blob; receiving a global reclamation complete message from the second data center; reading at least one data set from the first blob; and storing in a write buffer the at least one data set for encoding into a erasure code group in an alternative blob in the first data center. Further, upon receipt of the global reclamation message from the second data center, indicating the first blob is free in the map in the first data center. In one embodiment, selecting the first blob is based on the map indicating free space in the first data center.
32 Citations
10 Claims
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1. A method for reclaiming free space in a storage system, comprising:
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selecting a first blob for reclamation from a first data center; sending a first message to a second data center indicating the first blob is to be reclaimed; reclaiming the first blob from the first data center; sending a second message to the second data center after reclaiming the first blob; and receiving a global reclamation complete message from the second data center; wherein; the global reclamation complete message indicates a second blob in the second data center has been reclaimed; the second blob comprising data associated with data in the first blob; the storage system comprises a plurality of data centers; each data center maintains a local erasure code and a map of data stored locally therein; and the plurality of data centers is protected by a global erasure code distributed across all blobs across all data centers. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for reclaiming free space in a storage system, comprising:
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sending a first message to a second data center indicating a first blob is to be reclaimed; reclaiming the first blob from the first data center; sending a second message to the second data center after reclaiming the first blob; and receiving a global reclamation complete message from the second data center, wherein the global reclamation complete message indicates a second blob in the second data center has been reclaimed;
the second blob comprising data associated with data in the first blob. - View Dependent Claims (9, 10)
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Specification