4. How to mirror the root disk on a hp pa-risc hp-ux system?

How to mirror the root disk on a hp pa-risc hp-ux system?


  • Mirroring the root disk on an itanium hp systems and a pa-risc hp system differ, here only the pa-risc method is shown, look at the how to on itanium root disk mirroring for that type.

    First determine your current root disk hardware path

    # setboot
Primary bootpath : 0/1/1/0.0.0
Alternate bootpath : 0/0/2/0.3.0

Autoboot is ON (enabled)
Autosearch is ON (enabled)

    By running the ioscan command you'll see that the alternate boot path is currently the dvd-rom, make a note of the root disk device paths.

    # ioscan -fun -C disk

    To check the number of disks being used for the root volume group run vgdisplay, here you see right at the end of the output the physical volumes used. This will determine if you have mirror only one disk or more. In this example we are mirroring one disk only.

    # vgdisplay -v vg00
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 18
Open LV 18
Max PV 8
Cur PV 1
Act PV 1
Max PE per PV 9200
VGDA 2
PE Size (Mbytes) 16
Total PE 4318
Alloc PE 3434
Free PE 884
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

--- Logical volumes ---
LV Name /dev/vg00/lvol1
LV Status available/syncd
LV Size (Mbytes) 592
Current LE 37
Allocated PE 37
Used PV 1

LV Name /dev/vg00/lvol2
LV Status available/syncd
LV Size (Mbytes) 16000
Current LE 1000
Allocated PE 1000
Used PV 1

LV Name /dev/vg00/lvol3
LV Status available/syncd
LV Size (Mbytes) 1024
Current LE 64
Allocated PE 64
Used PV 1



LV Name /dev/vg00/lvol5
LV Status available/syncd
LV Size (Mbytes) 8192
Current LE 512
Allocated PE 512
Used PV 1

LV Name /dev/vg00/lvol6
LV Status available/syncd
LV Size (Mbytes) 1024
Current LE 64
Allocated PE 64
Used PV 1

LV Name /dev/vg00/lvol7
LV Status available/syncd
LV Size (Mbytes) 8192
Current LE 512
Allocated PE 512
Used PV 1

LV Name /dev/vg00/lvol8
LV Status available/syncd
LV Size (Mbytes) 512
Current LE 32
Allocated PE 32
Used PV 1

LV Name /dev/vg00/lvol9
LV Status available/syncd
LV Size (Mbytes) 12000
Current LE 750
Allocated PE 750
Used PV 1

LV Name /dev/vg00/lvol10
LV Status available/syncd
LV Size (Mbytes) 4096
Current LE 256
Allocated PE 256
Used PV 1


--- Physical volumes ---
PV Name /dev/dsk/c1t7d0s2
PV Status available
Total PE 4318
Free PE 884
Autoswitch On

    Determine the h/w path and device name of an unused disk that will be the root mirror, again use ioscan, then run the following. Note your device could be different.

    Create a physical volume, so the disk can be part of Logical Volume Manager (LVM).

    # /usr/sbin/pvcreate -f -B /dev/rdsk/c1t0d0
Physical volume "/dev/rdsk/c1t0d0" has been successfully created.

    Extend the disk into the root volume group

    # /usr/sbin/vgextend /dev/vg00 /dev/dsk/c1t0d0
Volume group "/dev/vg00" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf

    Create the boot area on the disk, either character device or block device can be used.

    # /usr/sbin/mkboot /dev/rdsk/c1t0d0

    Run the mkboot again to update the boot string in the AUTO file. The "-lq" allow the disk to boot with quorum, this basically means with being associated with the primary root disk.

    # /usr/sbin/mkboot -a "hpux -lq" /dev/rdsk/c1t0d0

    Use lvextend to mirror each logical volume on the root disk in the same order as the orginal root disk.
    To get the current root disk logical volume order do:

    # pvdisplay -v /dev/dsk/c1t7d0s2 | grep current | grep 00000

    Mirror the logical volume, in the order displayed above. We are only showing the mirroring of on logical volume, perform the same for all the logical volumes or create a for loop in a script.

    # lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c1t0d0s2
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol1" has been successfully extended.

    Update the root volume group information, reestablish LVM knowledge of root, boot, swap and dump areas. This can be run individually or as one command:

    # lvlnboot -R /dev/vg00
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf

    or

    # /usr/sbin/lvlnboot -b /dev/vg00/lvol1
# /usr/sbin/lvlnboot -r /dev/vg00/lvol3
# /usr/sbin/lvlnboot -s /dev/vg00/lvol2
# /usr/sbin/lvlnboot -d /dev/vg00/lvol2
# /usr/sbin/lvlnboot -R

    Display the boot disk reserved area using lvlnboot.

    # lvlnboot -v
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c1t7d0s2 (0/4/1/0.7.0) -- Boot Disk
/dev/dsk/c1t0d0 (0/4/1/0.0.0)
/dev/dsk/c1t0d0s2 (0/4/1/0.0.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c1t7d0s2
/dev/dsk/c1t0d0s2
Root: lvol3 on: /dev/dsk/c1t7d0s2
/dev/dsk/c1t0d0s2
Swap: lvol2 on: /dev/dsk/c1t7d0s2
/dev/dsk/c1t0d0s2
Dump: lvol2 on: /dev/dsk/c1t7d0s2, 0

    Set the alternate boot path to the newly mirrored disk

    # setboot -a 0/4/1/0.0.0

    Finally edit the /stand/bootconf. With a line beginning with a lowercase letter l, meaning logical, LVM or VxVM, for the newly mirrored disk.

    # vi /stand/bootconf
l /dev/dsk/c1t7d0s2
l /dev/dsk/c1t0d0s2

    The mirror disk should be tested on reboot simply boot into the alternate path, then shutdown and reboot again, booting into primary path.

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