SCSI I/O coordinator
First Claim
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1. An apparatus, comprising:
- a Small Computer System Interface (SCSI) input/output (I/O) coordinator that caches in memory local to the SCSI I/O coordinator a plurality of I/O request contexts stored in memory non-local to the SCSI I/O coordinator;
wherein the SCSI I/O coordinator associates the plurality of I/O request contexts with a plurality of respective I/O requests, wherein the SCSI I/O coordinator groups one or more sets of I/O requests from the plurality of I/O requests based on one or more of device latency and/or command latency associated with the one or more sets of I/O requests.
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Abstract
A Small Computer System Interface (SCSI) input/output (I/O) coordinator of an apparatus in an example caches in memory local to the SCSI I/O coordinator one or more I/O request contexts stored in memory non-local to the SCSI I/O coordinator.
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Citations
11 Claims
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1. An apparatus, comprising:
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a Small Computer System Interface (SCSI) input/output (I/O) coordinator that caches in memory local to the SCSI I/O coordinator a plurality of I/O request contexts stored in memory non-local to the SCSI I/O coordinator; wherein the SCSI I/O coordinator associates the plurality of I/O request contexts with a plurality of respective I/O requests, wherein the SCSI I/O coordinator groups one or more sets of I/O requests from the plurality of I/O requests based on one or more of device latency and/or command latency associated with the one or more sets of I/O requests.
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2. An apparatus, comprising:
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a Small Computer System Interface (SCSI) input/output (I/O) coordinator that caches in memory local to the SCSI I/O coordinator a plurality of I/O request contexts stored in memory non-local to the SCSI I/O coordinator; wherein the SCSI I/O coordinator associates the plurality of I/O request contexts with a plurality of respective I/O requests, wherein the SCSI I/O coordinator creates a plurality of sets of I/O requests from the plurality of I/O requests as heterogeneous I/O traffic based on a first category of high storage device latency and high I/O command latency, a second category of high storage device latency and low I/O command latency, a third category of low storage device latency and high I/O command latency, and a fourth category of low storage device latency and low I/O command latency. - View Dependent Claims (3, 4)
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5. An apparatus, comprising:
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a Small Computer System Interface (SCSI) input/output (I/O) coordinator that caches in memory local to the SCSI I/O coordinator a plurality of I/O request contexts stored in memory non-local to the SCSI I/O coordinator; wherein the SCSI I/O coordinator associates the plurality of I/O request contexts with a plurality of respective I/O requests, wherein the SCSI I/O coordinator creates a plurality of sets of I/O requests from the plurality of I/O requests based on categorization by one or more storage access patterns associated with the plurality of sets of I/O requests. - View Dependent Claims (6, 7)
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8. An apparatus, comprising:
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a Small Computer System Interface (SCSI) input/output (I/O) coordinator that caches in memory local to the SCSI I/O coordinator a plurality of I/O request contexts stored in memory non-local to the SCSI I/O coordinator; wherein the SCSI I/O coordinator associates the plurality of I/O request contexts with a plurality of respective I/O requests, wherein the SCSI I/O coordinator makes a determination that one or more I/O requests among the plurality of I/O requests deserve higher priority as higher-priority I/O requests, wherein the SCSI I/O coordinator changes an ordering of attention to a number of pending I/O requests of the plurality of I/O requests to give the higher priority to the higher-priority I/O requests.
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9. An apparatus. comprising:
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a Small Computer System Interface (SCSI) input/output (I/O) coordinator that caches in memory local to the SCSI I/O coordinator a plurality of I/O request contexts stored in memory non-local to the SCSI I/O coordinator; wherein the SCSI I/O coordinator associates the plurality of I/O request contexts with a plurality of respective I/O requests, wherein the SCSI I/O coordinator controls a quality of service (QoS) through placement of one or more higher-priority I/O requests of the plurality of I/O requests ahead of one or more lower-priority and already-pending I/O requests of the plurality of I/O requests.
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10. An apparatus. comprising:
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a Small Computer System Interface (SCSI) input/output (I/O) coordinator that applies spatial locality criteria to improve cache hit rate in memory local to the SCSI I/O coordinator for a plurality of I/O request contexts stored in memory non-local to the SCSI I/O coordinator; wherein the SCSI I/O coordinator associates the plurality of I/O request contexts with a plurality of respective I/O requests, wherein the SCSI I/O coordinator identifies spatial locality in one or more of the plurality of I/O requests through employment of one or more of SCSI command type, SCSI device type, SCSI task attribute, and/or SCSI transport factor.
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11. An apparatus, comprising:
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a Small Computer System Interface (SCSI) input/output (I/O) coordinator that applies spatial locality criteria to improve cache hit rate in memory local to the SCSI I/O coordinator for a plurality of I/O request contexts stored in memory non-local to the SCSI I/O coordinator; wherein the SCSI I/O coordinator associates the plurality of I/O request contexts with a plurality of respective I/O requests, wherein the SCSI I/O coordinator employs as the spatial locality criteria one or more of a specific ITLQ nexus that allows the SCSI I/O coordinator to identify spatial locality for any particular ITLQ nexus, a set of ITLQ nexuses that allows the SCSI I/O coordinator to identify spatial locality on a per-ITLQ nexus for a plurality of ITLQ nexuses, SCSI command operational code that allows the SCSI I/O coordinator to identify spatial locality among I/O requests of the plurality of I/O requests that comprise the command operational code, SCSI device type that allows the SCSI I/O coordinator to identify spatial locality among I/O requests of the plurality of I/O requests that are targeted to the SCSI Device type, SCSI I/O timer rules that allow the SCSI I/O coordinator to identify spatial locality among I/O requests of the plurality of I/O requests, and/or spatial locality interval that allows the SCSI I/O coordinator to identify spatial locality for I/O requests of the plurality of I/O requests that are expected to complete within the spatial locality interval across different ITLQ nexuses.
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Specification