TECHNIQUE FOR PACING AND BALANCING PROCESSING OF INTERNAL AND EXTERNAL I/O REQUESTS IN A STORAGE SYSTEM
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United States of America Patent
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Issued Date -
Nov 2, 2017
app pub date -
Apr 29, 2016
filing date -
Apr 29, 2016
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Abstract
A technique paces and balances a flow of messages related to processing of input/output (I/O) requests between subsystems, such as layers of a storage input/output (I/O) stack, of one or more nodes of a cluster. The I/O requests may be directed to externally-generated user data, e.g., write requests generated by a host coupled to the cluster, and internally-generated metadata, e.g., write and delete requests generated by a volume layer of the storage I/O stack. The user data (and metadata) may be organized as an arbitrary number of variable-length extents of one or more host-visible logical units (LUNs) served by the nodes. The metadata may include mappings from host-visible logical block address ranges (i.e., offset ranges) of a LUN to extent keys, which reference locations of the extents stored on storage devices, such as solid state drivers (SSDs), of a storage array coupled to the nodes. The I/O requests are received at a pacer of the volume layer configured to control delivery of the requests to an extent store layer of the storage I/O stack in a policy-dictated manner to enable processing and sequential storage of the user data and metadata on the SSDs of the storage array.
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