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

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


  • Mirroring the root disk on an itanium hp systems and a pa-risc hp system differ, here only the itanium method is shown, look at the how to on pa-risc root disk mirroring for that type. Note your devices could be different, and device naming is different on HP-UX 11i v3

    First determine your current root disk hardware path

    # setboot
Primary bootpath : 0/4/1/0.0.0.7.0
HA Alternate bootpath : 0/4/2/0
Alternate bootpath : 0/0/2/1.0.16.0.0

    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

    On the current root disk determine the sizes of the EFI partition, the HP-UX partition, and the HPSP partition, another article discusses what the are, but for now we'll just say they are systems partitions.

    # diskinfo -b /dev/rdsk/c1t7d0s1 | awk '{print $1 / (1024) }'
500
# diskinfo -b /dev/rdsk/c1t7d0s2 | awk '{print $1 / (1024) }'
69107
# diskinfo -b /dev/rdsk/c1t7d0s3 | awk '{print $1 / (1024) }'
400

    Create file with the size information obtained from the previous step, the 100% for HP-UX partition means after assigning 500MB for EFI and 400MB for the HPSP partitions, use 100% of the rest for HP-UX. The 3 means three partitions.

    vi /tmp/ipf
3
EFI 500MB
HPUX 100%
HPSP 400MB

    Partition your mirror disk using the idisk command:

    # idisk -f /tmp/idf -w /dev/rdsk/c1t0d0
idisk version: 1.31
********************** WARNING ***********************
If you continue you may destroy all data on this disk.
Do you wish to continue(yes/no)? yes

EFI Primary Header:
Signature = EFI PART
Revision = 0x10000
HeaderSize = 0x5c
HeaderCRC32 = 0x12887a5e
MyLbaLo = 0x1
AlternateLbaLo = 0x88bb991
FirstUsableLbaLo = 0x22
LastUsableLbaLo = 0x88bb96e
Disk GUID = 8227cf64-8c85-11dc-8001-d6217b60e588
PartitionEntryLbaLo = 0x2
NumberOfPartitionEntries = 0xc
SizeOfPartitionEntry = 0x80
PartitionEntryArrayCRC32 = 0x55e1fb33

Primary Partition Table (in 512 byte blocks):
Partition 1 (EFI):
Partition Type GUID = c12a7328-f81f-11d2-ba4b-00a0c93ec93b
Unique Partition GUID = 8227d108-8c85-11dc-8002-d6217b60e588
Starting Lba = 0x22
Ending Lba = 0xfa021
Partition 2 (HP-UX):
Partition Type GUID = 75894c1e-3aeb-11d3-b7c1-7b03a0000000
Unique Partition GUID = 8227d126-8c85-11dc-8003-d6217b60e588
Starting Lba = 0xfa022
Ending Lba = 0x87f396d
Partition 3 (HPSP):
Partition Type GUID = e2a1e728-32e3-11d6-a682-7b03a0000000
Unique Partition GUID = 8227d13a-8c85-11dc-8004-d6217b60e588
Starting Lba = 0x87f396e
Ending Lba = 0x88bb96d

EFI Alternate Header:
Signature = EFI PART
Revision = 0x10000
HeaderSize = 0x5c
HeaderCRC32 = 0x25f3c2cb
MyLbaLo = 0x88bb991
AlternateLbaLo = 0x1
FirstUsableLbaLo = 0x22
LastUsableLbaLo = 0x88bb96e
Disk GUID = 8227cf64-8c85-11dc-8001-d6217b60e588
PartitionEntryLbaLo = 0x88bb970
NumberOfPartitionEntries = 0xc
SizeOfPartitionEntry = 0x80
PartitionEntryArrayCRC32 = 0x55e1fb33

Alternate Partition Table (in 512 byte blocks):
Partition 1 (EFI):
Partition Type GUID = c12a7328-f81f-11d2-ba4b-00a0c93ec93b
Unique Partition GUID = 8227d108-8c85-11dc-8002-d6217b60e588
Starting Lba = 0x22
Ending Lba = 0xfa021
Partition 2 (HP-UX):
Partition Type GUID = 75894c1e-3aeb-11d3-b7c1-7b03a0000000
Unique Partition GUID = 8227d126-8c85-11dc-8003-d6217b60e588
Starting Lba = 0xfa022
Ending Lba = 0x87f396d
Partition 3 (HPSP):
Partition Type GUID = e2a1e728-32e3-11d6-a682-7b03a0000000
Unique Partition GUID = 8227d13a-8c85-11dc-8004-d6217b60e588
Starting Lba = 0x87f396e
Ending Lba = 0x88bb96d

Legacy MBR (MBR Signatures in little endian):
MBR Signature = 0xecce2782

Protective MBR

    Install special files for all partition on the disk.

    # insf -e -H 0/4/1/0.0.0.0.0
insf: Installing special files for sdisk instance 1 address 0/4/1/0.0.0.0.0

    After completing this you should have 8 special files, verify with

    # ioscan -fun -C disk

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

    # /usr/sbin/pvcreate -f -B /dev/rdsk/c1t0d0s2
Physical volume "/dev/rdsk/c1t0d0" has been successfully created.

    Extend the disk into the root volume group

    # /usr/sbin/vgextend /dev/vg00 /dev/dsk/c1t0d0s2
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. The -e is for EFI layout and the -l is for volume layout disk ie..VxVM or LVM.

    # /usr/sbin/mkboot -e -l /dev/rdsk/c1t0d0

    Before any other EFI commands can be run, efi_fsinit must be run to initialize the file system on a device file.

    # efi_fsinit -d /dev/rdsk/c1t0d0s1

    Copy the autoboot file from the root disk EFI partition to the current directory, copy it to the new disk s1

    # efi_cp -d /dev/rdsk/c1t7d0s1 -u /efi/hpux/auto ./AUTO

    Copy the contents of the AUTO boot file created in the previous step to the mirror disk

    # efi_cp -d /dev/rdsk/c1t0d0s1 ./AUTO /efi/hpux/auto

    Alternatviely, and this is recommended in most case, you can add ignore quorum so the mirror boots without interruption. The lq option ensures that the system will boot without quorum, that is without being tied to the root disk. In the event of the primary boot disk failing this will allow the mirror disk to boot.

    # print 'boot vmunix -lq' > /tmp/AUTO
# efi_cp -d /dev/rdsk/c1t0d0s1 /tmp/AUTO /efi/hpux/auto

    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 (0/4/1/0.0.0.7.0) -- Boot Disk
/dev/dsk/c1t0d0 (0/4/1/0.0.0.0.0)
/dev/dsk/c1t0d0s2 (0/4/1/0.0.0.0.0) -- 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

    Set the alternate boot path to the newly mirrored disk

    # setboot -a 0/4/1/0.0.0.0.0

    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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