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212 Creating and administering disk groups
Managing the configuration daemon in VxVM
To create a disk group with a previous version, specify the -T version option to
the vxdg init command.
For example, to create a disk group with version 120 that can be imported by a
system running VxVM 4.1, use the following command:
# vxdg -T 120 init newdg newdg01=c0t3d0
This creates a disk group, newdg, which can be imported by Veritas Volume
Manager 4.1. Note that while this disk group can be imported on the VxVM 4.1
system, attempts to use features from Veritas Volume Manager 5.0 will fail.
Managing the configuration daemon in VxVM
The VxVM configuration daemon (vxconfigd) provides the interface between
VxVM commands and the kernel device drivers.
vxconfigd handles
configuration change requests from VxVM utilities, communicates the change
requests to the VxVM kernel, and modifies configuration information stored on
disk.
vxconfigd also initializes VxVM when the system is booted.
The
vxdctl command is the command-line interface to the vxconfigd daemon.
You can use
vxdctl to:
■ Control the operation of the vxconfigd daemon.
■ Change the system-wide definition of the default disk group.
Note: In VxVM 4.0 and later releases, disk access records are no longer stored in
the /etc/vx/volboot file. Non-persistent disk access records are created by
scanning the disks at system startup. Persistent disk access records for simple
and nopriv disks are permanently stored in the /etc/vx/darecs file in the
root file system. The
vxconfigd daemon reads the contents of this file to locate
the disks and the configuration databases for their disk groups. (The /etc/vx/
darecs file is also used to store definitions of foreign devices that are not
autoconfigurable. Such entries may be added by using the
vxddladm addforeign
command. See the vxddladm(1M) manual page for more information.)
You can also use
vxdctl to:
■ Reconfigure the DMP database to include disk devices newly attached to, or
removed from the system.
■ Create DMP device nodes in the directories /dev/vx/dmp and /dev/vx/
rdmp.
■ Update the DMP database with changes in path type for active/passive disk
arrays. Use the utilities provided by the disk-array vendor to change the
path type between primary and secondary.