HP StorageWorks XP Continuous Access User Guide: HP XP12000 Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System (T1711-96025, May 2011)

Contents
1 XP Continuous Access features.....................................................................6
2 Overview of XP Continuous Access operations...............................................7
Components............................................................................................................................7
Disk arrays..........................................................................................................................8
Main and remote control units (MCUs and RCUs).....................................................................8
Volume pairs (P-VOLs and S-VOLs)..........................................................................................9
XP Continuous Access Synchronous consistency groups...........................................................10
XP Continuous Access Asynchronous consistency groups.........................................................10
Remote copy connections....................................................................................................11
Initiator ports and RCU target ports......................................................................................11
XP Remote Web Console....................................................................................................12
Host failover software.........................................................................................................12
Remote copy operations..........................................................................................................12
Initial copy operations........................................................................................................13
Update copy operation.......................................................................................................13
Read and write I/O operations for XP Continuous Access volumes...........................................14
Difference Management.....................................................................................................15
S-VOL write option.............................................................................................................17
XP Continuous Access Asynchronous recordset operations............................................................17
Creating and storing recordsets at the MCU..........................................................................17
Sending recordsets to the RCU.............................................................................................18
Storing recordsets at the RCU..............................................................................................18
Selecting and settling recordsets at the RCU..........................................................................18
Types of recordsets.............................................................................................................19
Inflow control of recordsets..................................................................................................19
Inflow control by MCU...................................................................................................19
Inflow control by RCU....................................................................................................19
XP Continuous Access Synchronous consistency group operations.................................................20
XP Continuous Access Asynchronous consistency group operations................................................22
Group options...................................................................................................................22
Copy pending timeout...................................................................................................22
RCU ready timeout........................................................................................................22
Group operations..............................................................................................................23
XP Continuous Access volume pair status...................................................................................23
XP Continuous Access LUSE pair status..................................................................................24
XP Continuous Access Asynchronous pair status.....................................................................24
XP Continuous Access split types (PSUS)................................................................................26
XP Continuous Access suspend types....................................................................................27
XP Continuous Access Asynchronous suspension conditions.....................................................29
3 Preparing for XP Continuous Access operations............................................31
System requirements................................................................................................................31
Requirements and restrictions....................................................................................................31
One-to-one volume copy operations.....................................................................................32
Logical unit (LU) types.........................................................................................................32
Consistency groups............................................................................................................32
Accessing XP Continuous Access P-VOLs and S-VOLs..............................................................33
Cache and nonvolatile storage (NVS)...................................................................................33
Contents 3