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InfoScale™ 9.0 Virtualization Guide - AIX

Last Published: 2025-09-09

Product(s): InfoScale & Storage Foundation (9.0)

Platform: AIX

Using DMP to provide multi-pathing for the root volume group (rootvg)

In many cases, the use of MPIO for the rootvg creates a situation with dual multi-pathing tools. To simplify system administration and improve system reliability, use DMP to provide multi-pathing for the rootvg.

DMP is supported for the rootvg on vSCSI, NPIV, and physical HBAs. DMP is also supported for alternate root disks and root disks with multiple volumes.

To use DMP on the rootvg, DMP requires a vendor-specific ODM predefined fileset. Arctera includes the predefined filesets for vSCSI devices in the Arctera product distribution. For other devices, obtain and install the ODM predefined fileset from the storage vendor. For example, for the IBM DS array, install the devices.fcp.disk.ibm.rte fileset.

http://www-1.ibm.com/support/docview.wss?rs=540&context=ST52G7&dc=D400&q1=host +script&uid=ssg1S4000199&loc=en_US&cs=utf-8&lang=en

Rootability is achieved by using the vxdmpadm command, which uses the OS Native stack support feature internally.

To get help about rootability

Run the following command:

# vxdmpadm help native

Manage DMP support for AIX boot volume group(rootvg)
Usage:
  vxdmpadm native { enable | disable } vgname=rootvg
  vxdmpadm native list [ vgname=rootvg ]
  vxdmpadm native { release | acquire } [ vgname=rootvg ]
where,
  enable   Enable DMP support for AIX boot volume group(rootvg)
  disable  Disable DMP support for AIX boot volume group(rootvg)
  list     List boot paths on which DMP support is enabled
  release  Giveback pvid to OS device paths corresponding to rootvg
  acquire  Takeover pvid from OS device paths corresponding to rootvg

To enable rootability

Run the following command:
```
# vxdmpadm native enable vgname=rootvg
```
Reboot the system to enable DMP support for LVM bootablity.

To disable rootability

Run the following command:
```
# vxdmpadm native disable vgname=rootvg
```
Reboot the system to disable DMP support for LVM bootability.

To monitor rootability

Run the following command:

# vxdmpadm native list
PATH          DMPNODENAME
==========================
hdisk64       ams_wms0_302 
hdisk63       ams_wms0_302

For more information about using DMP with rootvg, see the Dynamic Multi-Pathing Administrator's Guide.