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366 Creating and administering volume sets
Raw device node access to component volumes
value of the makedev attribute is currently set to on. The access mode is
determined by the current setting of the
compvol_access attribute.
The following example creates a volume set, myvset1, containing the volume,
myvol1, in the disk group, mydg, with raw device access enabled in read-write
mode:
# vxvset -g mydg -o makedev=on -o compvol_access=read-write \
make myvset1 myvol1
Displaying the raw device access settings for a volume set
You can use the vxprint -m command to display the current settings for a
volume set. If the
makedev attribute is set to on, one of the following is displayed
in the output:
vset_devinfo=on:read-only Raw device nodes in read-only mode.
vset_devinfo=on:read-write Raw device nodes in read-write mode.
This field is not displayed if
makedev is set to off.
Note: If the output from the vxprint -m command is fed to the vxmake command
to recreate a volume set, the
vset_devinfo attribute must set to off. Use the
vxvset set command to re-enable raw device access with the desired access mode
as described in “Controlling raw device access for an existing volume set” on
page 366.
Controlling raw device access for an existing volume set
To enable or disable raw device node access for an existing volume set, use the
following command:
# vxvset [-g diskgroup] [-f] set makedev={on|off} vset
The makedev attribute can be specified to the vxvset set command to create
(
makedev=on) or remove (makedev=off) the raw device nodes for the component
volumes of a volume set. If any of the component volumes are open, the
-f
(force) option must be specified to set the attribute to off.
Note: Specifying makedev=off removes the existing raw device nodes from the
/dev/vx/rdsk/diskgroup directory.
If the makedev attribute is set to off, and you use the mknod command to create
the raw device nodes, you cannot read from or write to those nodes unless you
set the value of makedev to on.