Restoring redundancy in a storage group when a storage device in the storage group fails

摘要

Provided are a system, computer program, and method for restoring redundancy in a storage group when a storage device in the storage group fails. In response to detecting a failure of a first storage device in a storage group, wherein the storage group stores each of a plurality of extents in the first storage device and a second storage device to provide redundancy, a determination is made whether a spare storage device that has a storage capacity less than that of the storage group. One of the extents in a storage location in the second storage device that is beyond an upper limit of positions in the spare storage device is moved to a new storage location. The spare drive is incorporated into the storage group to provide redundant storage for the storage group, wherein the extents in the storage group are copied to the spare drive.

主权项

1. A system managing access to data stored in one or more storage devices comprising:
a processor comprising a programmable data processing apparatus; and a non-transitory computer readable storage medium including code executable by the processor for performing operations, the operations comprising:
in response to detecting a failure of a first storage device in a storage group having a plurality of extents in both the first storage device and a second storage device to provide redundancy, determining whether a spare storage device has a storage capacity less than that of the extents of the storage group, wherein each of the first storage device and the second storage device have at least the storage capacity of the storage group that exceeds the storage capacity of the spare storage device;moving one of the extents in a storage location in the second storage device having a position higher than an upper limit of the spare storage device to a new storage location in the second storage device that is within the upper limit in the spare storage device in response to determining that the spare storage device has the storage capacity less than the extents of the storage group; andincorporating the spare storage device into the storage group to provide redundant storage for the storage group, wherein the extents in the storage group are copied to the spare storage device.