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| Configuring DMP for SAN booting | ||
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| Prev | Administering DMP | Next |
On AIX, you can configure a SAN disk for booting the operating system. Such a disk, called a SAN boot disk, contains the root volume group (rootvg). In order for the SAN disk to be used for booting (bootable), the SAN disk must be a Logical Volume Manager (LVM) disk. The SAN root disk must be an Active/Active (A/A), A/A-A, or ALUA type array.
You can configure a SAN boot disk so that Dynamic Multi-Pathing (DMP) provides the multi-pathing for this device.
DMP supports LVM root disks in the following ways:
DMP support for OS native LVM disks
When you enable the support for LVM disks, DMP provides multi-pathing functionality for the operating system native devices configured on the system. When this option is enabled, operations such as extendvg and mirrorvg can be done online.
DMP native support is controlled by the tunable parameter dmp_native_support. Veritas recommends this method.
DMP support for LVM root disks
When you enable the support for LVM root disks only, DMP manages the multi-pathing for the LVM root disk only.
LVM root disk support is controlled with the command: vxdmpadm native enable|disable vgname=rootvg
The procedures in this section describe configuring a SAN root disk under DMP control. Choose the appropriate method based on the existing configuration, as follows:
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Configure a new device. |
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Migrate an internal root disk. |
See Migrating an internal root disk to a SAN root disk under DMP control . |
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Migrate an existing SAN root disk under MPIO control |
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Migrate an existing SAN root disk under EMC PowerPath control |
See Migrating a SAN root disk from EMC PowerPath to DMP control. |
After you configure the root disk as a SAN root disk under DMP control, administer the root volume group.
See Administering the root volume group (rootvg) under DMP control.