CVM and VxVM Planning

You can create storage groups using the HP-UX Logical Volume Manager (LVM, described in the previous section), or using Veritas VxVM and CVM software.




	NOTE: Check the Serviceguard, SGeRAC, and SMS Compatibility and Feature Matrix and the latest Release Notes for your version of Serviceguard for up-to-date information on CVM support: `http://www.docs.hp.com ->` `High Availability -> Serviceguard`.

When designing a storage configuration using CVM or VxVM disk groups, consider the following:

You must create a rootdg disk group on each cluster node that will be using VxVM storage. This is not the same as the HP-UX root disk, if an LVM volume group is used. The VxVM root disk group can only be imported on the node where it is created. This disk group is created only once on each cluster node.
NOTE: The VxVM rootdg is only required for VxVM 3.5 and earlier; it is not required for VxVM 4.1 and later.
CVM disk groups are created after the cluster is configured, whereas VxVM disk groups may be created before cluster configuration if desired.
High availability applications, services, and data should be placed in separate disk groups from non-high availability applications, services, and data.
You must not group two different high availability applications, services, or data, whose control needs to be transferred independently, onto the same disk group.
Your HP-UX root disk can belong to an LVM or VxVM volume group (starting from VxVM 3.5) that is not shared among cluster nodes.
A cluster lock disk must be configured into an LVM volume group; you cannot use a VxVM or CVM disk group. (See “Cluster Lock Planning” for information about cluster lock options.)
VxVM disk group names should not be entered into the cluster configuration file. These names are not inserted into the cluster configuration file by cmquerycl.

CVM and VxVM Worksheet

The following worksheet will help you organize and record your specific physical disk configuration. This worksheet is an example; blank worksheets are in Appendix F “Blank Planning Worksheets”. Make as many copies as you need. Fill out the worksheet and keep it for future reference.

This worksheet includes volume groups and physical volumes. If you are using the cluster file system, begin planning your multi-node packages here.

 =========================================================================
 
Disk Group Name: ______dg01_____________________
  Disk Name: _____________________c1t2d0__________________________ 
  Disk Name: _____________________c2t2d0__________________________ 
  Disk Name: _____________________c3t2d0__________________________
  Disk Name: _____________________________________________________
CFS DG Package Name: ___________SG-CFS-DG_1_____
CFS Volume, MP, and MP Pkg: _logdata_/mnt/lvol1_ SG-CFS-MP_1______
CFS Volume, MP, and MP Pkg: ______________________________________
 
Disk Group Name: ______dg02______________________
Disk Name: _____________________c1t3d0__________________________
Disk Name: _____________________c2t3d0__________________________
Disk Name: _____________________c3t3d0__________________________
CFS DG Package Name: ___________SG-CFS-DG_2_____
CFS Volume, MP, and MP Pkg: _hrdata__/mnt/lvol4_ SG-CFS-MP_2____
CFS Volume, MP, and MP Pkg: ____________________________________

CVM and VxVM Planning

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CVM and VxVM Worksheet