Veritas InfoScale™ 7.4.1 Virtualization Guide - AIX
- Section I. Overview
- Storage Foundation and High Availability Solutions in AIX PowerVM virtual environments
- Section II. Implementation
- Setting up Storage Foundation and High Availability Solutions in AIX PowerVM virtual environments
- Supported configurations for Virtual I/O servers (VIOS) on AIX
- Installing and configuring Storage Foundation and High Availability (SFHA) Solutions in the logical partition (LPAR)
- Installing and configuring Cluster Server for logical partition and application availability
- Supported configurations for Virtual I/O servers (VIOS) on AIX
- Setting up Storage Foundation and High Availability Solutions in AIX PowerVM virtual environments
- Section III. Use cases for AIX PowerVM virtual environments
- Application to spindle visibility
- Simplified storage management in VIOS
- Configuring Dynamic Multi-Pathing (DMP) on Virtual I/O server
- Configuring Dynamic Multi-Pathing (DMP) pseudo devices as virtual SCSI devices
- Extended attributes in VIO client for a virtual SCSI disk
- Virtual machine (logical partition) availability
- Simplified management and high availability for IBM Workload Partitions
- Implementing Storage Foundation support for WPARs
- How Cluster Server (VCS) works with Workload Patitions (WPARs)
- Configuring VCS in WPARs
- High availability and live migration
- Limitations and unsupported LPAR features
- Multi-tier business service support
- Server consolidation
- About IBM Virtual Ethernet
- Using Storage Foundation in the logical partition (LPAR) with virtual SCSI devices
- How DMP handles I/O for vSCSI devices
- Physical to virtual migration (P2V)
- Section IV. Reference
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. Veritas 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.
Rootability is achieved by using the vxdmpadm command, which uses the OS Native stack support feature internally.
- 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
- Run the following command:
# vxdmpadm native enable vgname=rootvg
- Reboot the system to enable DMP support for LVM bootablity.
- Run the following command:
# vxdmpadm native disable vgname=rootvg
- Reboot the system to disable DMP support for LVM bootability.
- 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.