Hitachi G1000 - Page 4

GAD pair operations.............................................................................................. 1-19
Initial copy and differential copy.............................................................................1-20
GAD components.................................................................................................. 1-21
User interfaces for global-active device operations...................................................1-22
Hitachi Command Suite .................................................................................. 1-23
Command Control Interface ............................................................................1-23
Configuration workflow for global-active device.......................................................1-23
2 System requirements............................................................................ 2-1
Requirements and restrictions..................................................................................2-2
Interoperability requirements...................................................................................2-4
Volume types that can be used for GAD............................................................. 2-4
Dynamic Provisioning / Dynamic Tiering.............................................................2-6
ShadowImage ................................................................................................. 2-6
Limitations when sharing GAD and ShadowImage volumes........................ 2-8
SI operations and GAD pair status............................................................ 2-8
GAD operations and SI pair status.......................................................... 2-11
Thin Image ................................................................................................... 2-12
Limitations for using both GAD and Thin Image.......................................2-13
Thin Image operations and GAD status................................................... 2-14
GAD operations and Thin Image pair status.............................................2-16
Use cases for pairing GAD volumes with SI or HTI............................................ 2-17
Data Retention Utility .....................................................................................2-17
GAD status and I/O allowance by access attribute................................... 2-18
LUN Manager ................................................................................................ 2-19
Virtual Partition Manager ................................................................................2-19
Volume Shredder ...........................................................................................2-19
Performance Monitor ......................................................................................2-19
GAD I/O added to Performance Monitor.................................................. 2-20
Number of I/Os to the port to be added to Performance Monitor.............. 2-21
3 Planning for global-active device............................................................3-1
Storage system preparation.....................................................................................3-2
Planning system performance.................................................................................. 3-3
Hitachi Dynamic Link Manager...........................................................................3-3
Planning physical paths........................................................................................... 3-4
Determining the required bandwidth.................................................................. 3-4
Fibre-Channel connections................................................................................ 3-5
Connection types..............................................................................................3-6
Direct connection.................................................................................... 3-6
Connection using switches....................................................................... 3-7
Connection using channel extenders.........................................................3-8
Planning ports........................................................................................................ 3-9
Planning the quorum disk...................................................................................... 3-10
Installation of the external storage system....................................................... 3-10
Relationship between the quorum disk and number of remote connections......... 3-11
Suspended pairs depending on failure location (quorum disk not shared).. 3-13
Suspended pairs depending on failure location (shared quorum disk)........ 3-15
Response time from the external storage system.............................................. 3-15
Planning GAD pairs and pair volumes..................................................................... 3-16
Maximum number of GAD pairs....................................................................... 3-16
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Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide