HP P6000 Continuous Access Implementation Guide (T3680-96431, August 2012)

Contents
1 HP P6000 Continuous Access .....................................................................7
Features..................................................................................................................................7
Remote replication concepts.......................................................................................................8
Write modes ......................................................................................................................8
DR groups ..........................................................................................................................8
DR group write history log.....................................................................................................9
Managed sets.....................................................................................................................9
Failover............................................................................................................................10
Failsafe mode....................................................................................................................10
Failsafe on Link-down/Power-up...........................................................................................11
Implementation checklist..........................................................................................................11
2 Designing a remote application solution......................................................14
Tools for gathering SAN data...................................................................................................14
Choosing the remote site.........................................................................................................14
High availability................................................................................................................15
Recovery time objective..................................................................................................15
Disaster tolerance..............................................................................................................15
Disaster tolerance and distance.......................................................................................15
Determining the minimum separation distance...................................................................15
Distance and performance..................................................................................................16
Latency factor...............................................................................................................16
Determining intersite latency...........................................................................................17
Evaluating intersite latency.............................................................................................17
Cost.................................................................................................................................17
Choosing the intersite link........................................................................................................17
Distance...........................................................................................................................17
Recovery point objective.....................................................................................................18
Bandwidth .......................................................................................................................18
Bandwidth capacity and peak loads....................................................................................18
Determining the critical sample period.............................................................................19
Sizing bandwidth for synchronous replication....................................................................19
Sizing bandwidth for asynchronous replication..................................................................20
Evaluating bandwidth capacity............................................................................................20
Choosing a write mode...........................................................................................................20
Asynchronous write mode...................................................................................................21
Basic asynchronous mode..............................................................................................21
Enhanced asynchronous mode........................................................................................21
Synchronous mode.............................................................................................................22
Maintaining DR group I/O consistency.................................................................................22
3 Planning the remote replication fabric.........................................................23
Basic dual-fabric configuration.................................................................................................23
Basic configuration limits....................................................................................................23
Basic configuration rules.....................................................................................................24
Extended fabric using long-distance GBICs and SFPs..............................................................24
Extended fabric using WDM...............................................................................................24
Fabric to IP............................................................................................................................25
Fibre Channel-to-IP.............................................................................................................25
FC-to-IP configuration limits.............................................................................................25
FC-to-IP configuration rules.............................................................................................25
Configurations with application failover.....................................................................................26
Contents 3