Compaq ProSignia 300 SMART-2DH Array Controller Reference Guide - Page 148

Concurrent I/O Request Servicing, Optimized Request Management

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D-15 Concurrent I/O Request Servicing SMART-2DH Controller has the capability to service hundreds of I/O requests at a time. For example, if you request data that resides on the first drive and another user requests data that resides on the second drive, the controller can deliver both pieces of information concurrently. Figure D-9 illustrates concurrent request servicing. User 1 Request User 2 Request User 3 Request User 4 Request Daz-9-10.EPS Figure D-9. Concurrent Request Servicing handles several I/O requests Optimized Request Management Optimized request management, also known as elevator trend sorting, is another performance enhancement feature provided by the SMART-2DH Controller. The controller receives and queues multiple data requests from the operating system. The controller then rearranges the requests in an order that optimizes performance. SMART-2DH Array Controller Reference Guide Writer: Pamela King Project: SMART-2DH Array Controller Reference Guide Comments: 295469-002 File Name: K-APPD.DOC Last Saved On: 2/27/98 12:06 PM COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED

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D-15
SMART-2DH Array Controller Reference Guide
Writer: Pamela King
Project: SMART-2DH Array Controller Reference Guide
Comments: 295469-002
File Name: K-APPD.DOC
Last Saved On: 2/27/98 12:06 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Concurrent I/O Request Servicing
SMART-2DH Controller has the capability to service hundreds of I/O requests
at a time. For example, if you request data that resides on the first drive and
another user requests data that resides on the second drive, the controller can
deliver both pieces of information concurrently. Figure D-9 illustrates
concurrent request servicing.
User 1
Request
User 2
Request
User 3
Request
User 4
Request
Daz-9-10.EPS
Figure D-9.
Concurrent Request Servicing handles several I/O requests
Optimized Request Management
Optimized request management, also known as elevator trend sorting, is
another performance enhancement feature provided by the SMART-2DH
Controller. The controller receives and queues multiple data requests from the
operating system. The controller then rearranges the requests in an order that
optimizes performance.