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


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

This release supports using DMP for the rootvg on vSCSI, NPIV, and physical HBAs. Starting with release 5.1, DMP provides support for alternate root disks and root disks with multiple volumes.

To use DMP on the rootvg, DMP requires a vendor-specific ODM predefined fileset. Symantec includes the predefined filesets for vSCSI devices in the Veritas 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

In this release, with the help of OS Native stack support feature, rootability is achieved by using the vxdmpadm command. In previous releases, rootability was achieved through the use of the vxdmproot install command.

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 ] 
where, 
enable Enable DMP support for AIX boot volume group(rootvg) 
list List boot paths on which DMP support is enabled 
disable Disable DMP support for AIX boot volume group(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