HP StorageWorks SAN Virtualization Services Platform Best Practices Guide (5697-0935, May 2011)

DPM group.......................................................................................................................27
Primary and secondary DPMs..............................................................................................27
Pool characteristics.............................................................................................................27
Virtual disk path presentations and resource limits..................................................................27
Front-end presentations..................................................................................................27
Back-end resource limits.................................................................................................27
PiT and snapshots...................................................................................................................27
Snapclones............................................................................................................................29
Virtual disks with dynamically allocated capacity........................................................................30
Using thin provisioning.......................................................................................................30
7 Hardware................................................................................................32
Data Path Modules.................................................................................................................32
Working with DPM groups..................................................................................................32
VSM servers...........................................................................................................................33
8 Hosts......................................................................................................34
Operating system and application considerations.......................................................................34
VMware ESX.....................................................................................................................34
Cluster bit in HP-UX/Linux Serviceguard................................................................................36
Windows..........................................................................................................................36
SQL/TempDB...............................................................................................................36
Linux................................................................................................................................36
9 Data migration.........................................................................................37
Migration tasks......................................................................................................................37
PiTs and snapshots..................................................................................................................37
10 Synchronous mirroring.............................................................................40
Overview..............................................................................................................................40
Synchronous mirror metadata..............................................................................................40
Operating modes..............................................................................................................41
Synchronous mirror best practice..........................................................................................41
Dirty regions..........................................................................................................................42
Segment size.........................................................................................................................42
Synchronous mirror configurations.............................................................................................42
Working set recommendations.................................................................................................43
PiTs in conjunction with synchronous mirrors...............................................................................43
Migrating an existing synchronous mirror group..........................................................................43
Prepare destination site group.............................................................................................44
Migrate to the destination site pool......................................................................................44
Prepare the source site pool................................................................................................44
Migrate to the destination site pool......................................................................................45
Re-create synchronous mirror groups.....................................................................................45
Striped pooling with EVAx400 arrays...................................................................................45
Improving synchronous mirroring performance............................................................................46
Stretched domains..................................................................................................................47
EVA online upgrade and synchronous mirrors.............................................................................48
Oracle..................................................................................................................................48
4 Contents