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Mirroring the Root File System and Primary Swap
By using mirror copies of the root or primary swap logical volumes on
another disk, you will be able to use the copies to keep your system
in operation, if either of these logical volumes fail.
To mirror the root file system, you must first add a bootable LVM disk:
1. Create a physical volume using pvcreate with the -B option.
pvcreate -B /dev/rdsk/c0t3d0
2. Add the physical volume to your existing root volume group with vgextend:
vgextend /dev/vg00 /dev/dsk/c0t3d0
3. Use mkboot(1M) to place boot utilities in the boot area:
mkboot /dev/rdsk/c0t3d0
4. Use mkboot -a to add an AUTO file in boot LIF area:
mkboot -a "hpux (52.3.0;0)/stand/vmunix" /dev/rdsk/c0t3d0
________________________________________________________________________
NOTE This example includes creating a mirror copy of the primary swap
logical volume. The primary swap mirror does not need to be on a
specific disk or at a specific location, but it does need to be
allocated on contiguous disk space. The recommended mirror policy
for primary swap is to have the Mirror Write Cache and the Mirror
Consistency Recovery mechanisms disabled.
When primary swap is mirrored and your primary swap device also
serves as a dump area (see "Setting Up Dump Areas" in Chapter 6),
you must make sure that Mirror Write Cache and Mirror Consistency
Recovery is set to off at boot time to avoid loss of your dump. To
reset these options, you will need to reboot your system in
maintenance mode. Then use the the lvchange command with the -M n
and -c n options.
______________________________________________________________________
5. Mirror the root logical volume to the above disk:
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c0t3d0
6. Mirror the primary swap logical volume:
lvextend -m 1 /dev/vg00/prswaplv /dev/dsk/c0t3d0
7. Verify that the boot information contained in the BDRA of the boot
disks in the root volume group has been automatically updated by
lvlnboot(1M) with the locations of the mirror copies of root and
primary swap:
lvlnboot -v
Once you have created mirror copies of the root logical volume and the
primary swap logical volume, should either of the disks fail, the system
can use the copy of root or of primary swap on the other disk and
continue. When the failed disk comes back online, it will be
automatically recovered, provided the system has not been rebooted.
If the system is rebooted before the disk is back online, you will need
to reactivate the disk and update the LVM data structures that track the
disks within the volume group. You can use vgchange -a y even though the
volume group is already active.
For example, you can reactivate the disk using:
vgchange -a y /dev/vg00
As a result, LVM scans and activates all available disks in the volume
group, vg00, including the disk that came online after the system rebooted.
__
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