US 2014/0229676 A1 · REBUILD OF REDUNDANT SECONDARY STORAGE CACHE

Abstract

System and techniques for rebuilding a redundant secondary storage cache including a first storage device and a second storage device are described. A metadata entry indicative of a validity of a portion of information stored by a first storage cache device and associated with a region of a primary storage device is received. When the validity of the portion of information associated with the region of the primary storage device is established, a region lock is requested on the region of the primary storage device associated with the portion of information stored by the first storage cache device. Then, the portion of information and the corresponding metadata entry associated with the region of the primary storage device is copied from the first cache storage device to a second storage cache device to rebuild the second storage cache device.

Claims20

Dependent claims

A system for rebuilding a redundant secondary storage cache comprising a first storage device and a second storage device, the system comprising:

a processor configured to receiving a metadata entry indicative of a validity of a portion of information stored by a first storage cache device and associated with a region of a primary storage device;
and
a memory configured to store the metadata entry indicative of the validity of the portion of information stored by the first storage cache device, the memory having computer executable instructions stored thereon, the computer executable instructions configured for execution by the processor to:
establish the validity of the portion of information associated with the region of the primary storage device,
request a region lock on the region of the primary storage device associated with the portion of information stored by the first storage cache device when the validity of the portion of information associated with the region of the primary storage device is established, and
copy the portion of information and the corresponding metadata entry associated with the region of the primary storage device from the first cache storage device to a second storage cache device to rebuild the second storage cache device.

3 more elements

A computer-implemented method for rebuilding a redundant secondary storage cache comprising a first storage device and a second storage device, the computer-implemented method comprising:

receiving a metadata entry indicative of a validity of a portion of information stored by a first storage cache device and associated with a region of a primary storage device;
when the validity of the portion of information associated with the region of the primary storage device is established, requesting a region lock on the region of the primary storage device associated with the portion of information stored by the first storage cache device;
when an indication that the metadata entry has changed is received after requesting the region lock on the region of the primary storage device associated with the portion of information stored by the first storage cache device, releasing the region lock on the region of the primary storage device associated with the portion of information stored by the first storage cache device;
and
when an indication that the metadata entry has changed is not received after requesting the region lock on the region of the primary storage device associated with the portion of information stored by the first storage cache device, causing a processor to copy the portion of information and the corresponding metadata entry associated with the region of the primary storage device from the first cache storage device to a second storage cache device to rebuild the second storage cache device.

2 more elements

Dependencies are inferred from the claim text.

Rebuild of redundant secondary storage cache

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Rebuild of redundant secondary storage cache

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Abstract

Claims20