Storage system performance recovery after storage processor failure

摘要

A method performed by a storage system includes a first storage processor performing input/output (IO) requests on a first one or more logical units, and a second storage processor performing IO requests on a second one or more logical units. If the first storage processor fails, the third storage processor performs the IO requests on the first one or more logical units. If the second storage processor fails, the fourth storage processor performing the IO requests on the second one or more logical units.

主权项

1. A method performed by a storage system comprising a first storage processor enclosure comprising a first storage processor comprising a first cache, and a second storage processor comprising a second cache, the second storage processor connected to the first storage processor by a first cache mirroring connection; a second storage processor enclosure comprising a third storage processor comprising a third cache; and a fourth storage processor comprising a fourth cache, the fourth storage processor connected to the third storage processor by a second cache mirroring connection; wherein the first storage processor is connected to the fourth storage processor by a third cache mirroring connection, and the second storage processor is connected to the third storage processor by a fourth cache mirroring connection; and a disk enclosure comprising a plurality of disk units forming a plurality of logical units, wherein the disk enclosure is connected to the first storage processor, the second storage processor, the third storage processor, and the fourth storage processor, the method comprising:
performing, by the first storage processor, input/output (IO) requests on a first one or more logical units of the plurality of logical units; performing, by the second storage processor, IO requests on a second one or more logical units of the plurality of logical units; mirroring, by the first storage processor and the second storage processor, the first cache and the second cache via the first cache mirroring connection; if the first storage processor fails, performing, by the third storage processor, the IO requests on the first one or more logical units, and mirroring, by the second storage processor and the third storage processor, the second cache and the third cache via the fourth cache mirroring connection; and if the second storage processor fails, performing, by the fourth storage processor, the IO requests on the second one or more logical units, and mirroring, by the first storage processor and the fourth storage processor, the first cache and the fourth cache via the third cache mirroring connection.