Contents
Preface.................................................................................................. ix
Intended audience..................................................................................................... x
Product version..........................................................................................................x
Release notes............................................................................................................ x
Document revision level..............................................................................................x
Changes in this revision..............................................................................................x
Referenced documents...............................................................................................x
Document conventions.............................................................................................. xi
Convention for storage capacity values...................................................................... xii
Accessing product documentation..............................................................................xii
Getting help............................................................................................................ xiii
Comments...............................................................................................................xiii
1 Overview of global-active device............................................................1-1
About global-active device.......................................................................................1-2
Global-active device solutions.................................................................................. 1-3
Fault-tolerant storage infrastructure...................................................................1-3
Failover clustering without storage impact..........................................................1-4
Server load balancing without storage impact..................................................... 1-5
System configurations for GAD solutions............................................................ 1-6
GAD and global storage virtualization....................................................................... 1-9
About the virtual ID.......................................................................................... 1-9
Monitoring GAD status...........................................................................................1-10
GAD status.....................................................................................................1-10
GAD status transitions.....................................................................................1-11
Pair status .....................................................................................................1-12
I/O modes......................................................................................................1-12
Relationship between GAD status, pair status, and I/O mode............................. 1-13
Global-active device and server I/O........................................................................ 1-14
Server I/O when the GAD status is Mirrored......................................................1-15
Server I/O when the GAD status is Mirroring.....................................................1-15
Server I/O when the GAD status is Suspended..................................................1-16
Server I/O when the GAD status is Blocked.......................................................1-17
Quorum disk and server I/O...................................................................................1-17
I/O stoppage detected in the counterpart system..............................................1-18
I/O stoppage not detected in the counterpart system........................................ 1-19
iii
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
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