EMC Symmetrix DMX-3 User Manual

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EMC Symmetrix DMX-3 Product Guide
Contents
Storage bay power subsystem components........................... 87
DMX-3 communications and environmental control .................. 89
Communications control functions......................................... 89
Environmental control functions............................................. 90
Channel attachments ........................................................................ 92
FICON channel interface connections .................................... 92
ESCON channel interface connections ................................... 95
Mainframe serial channel extenders ....................................... 97
Open systems Fibre Channel interface connections ............. 98
Chapter 3 Symmetrix DMX-3 Input/Output Operations
Symmetrix DMX-3 operation ........................................................ 102
Symmetrix global memory management............................. 103
Elements of a Symmetrix I/O operation ..................................... 105
I/O response time: Mainframe environment....................... 105
I/O response time: Open systems environment ................. 106
Symmetrix I/O operations ..................................................... 106
Read operations........................................................................ 108
Write operations....................................................................... 110
Write destaging operation ...................................................... 112
I/O performance enhancements................................................... 113
Chapter 4 Performance and Optimization
Overview.......................................................................................... 116
Global memory performance features ......................................... 117
Global memory ASICs............................................................. 118
Tag Based Caching (TBC)........................................................ 119
Fast write capabilities.............................................................. 120
Dynamic Mirror Service Policy (DMSP) algorithm ............ 120
Disk Rotational Position Ordering (RPO) ............................ 120
Disk Multiple Priority Queues (DMPQ)............................... 120
PermaCache option.................................................................. 121
Symmetrix file system performance features.............................. 122
Dynamically adjusting performance algorithms................. 122
Enhancement of dynamic mirror service policy ................. 122
Enhancement of Symmetrix Optimizer ................................ 122
Enhanced system audit and investigation ........................... 123
Multiple channel directors............................................................. 124
Channel speeds and cable lengths......................................... 124
Host connectivity ..................................................................... 126
Open systems hypervolumes ....................................................... 127

EMC Symmetrix DMX-3 Specifications

General

Brand	EMC
Model	Symmetrix DMX-3
Category	Storage
Language	English