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120 Administering disks
Displaying disk information
The vxassist command overrides the reservation and creates a 20 megabyte
volume on mydg03. However, the command:
# vxassist -g mydg make vol04 20m
does not use mydg03, even if there is no free space on any other disk.
To turn off reservation of a disk, use the following command:
# vxedit [-g diskgroup] set reserve=off diskname
See the vxedit(1M) manual page for more information.
Displaying disk information
Before you use a disk, you need to know if it has been initialized and placed
under VxVM control. You also need to know if the disk is part of a disk group,
because you cannot create volumes on a disk that is not part of a disk group. The
vxdisk list command displays device names for all recognized disks, the disk
names, the disk group names associated with each disk, and the status of each
disk.
To display information on all disks that are known to VxVM, use the following
command:
# vxdisk list
VxVM returns a display similar to the following:
DEVICE TYPE DISK GROUP STATUS
c0t0d0 auto:hpdisk mydg04 mydg online
c1t0d0 auto:hpdisk mydg03 mydg online
c1t1d0 auto:hpdisk - - online invalid
enc0_2 auto:hpdisk mydg02 mydg online
enc0_3 auto:hpdisk mydg05 mydg online
enc0_0 auto:hpdisk - - online
enc0_1 auto:hpdisk - - online
The phrase online invalid in the STATUS line indicates that a disk has not
yet been added to VxVM control. These disks may or may not have been
initialized by VxVM previously. Disks that are listed as online are already
under VxVM control.
VxVM cannot access stale device entries in the /dev/disk and /dev/rdisk
directories. I/O cannot be performed to such devices, which are shown as being
in the error state.
To display details on a particular disk that is defined to VxVM, use the following
command:
# vxdisk [-v] list diskname
The -v option causes the command to additionally list all tags and tag values
that are defined for the disk. Without this option, no tags are displayed.