Not able to take backup from the Mirrored Disk

[Dolphi]

I am using HP rp 3410. Earlier there were two hard disks and now the main one gone faulty and the server is running through the mirrored. When I reboot the server it works fine but when I take backup (scbackup - Full backup) it says "root boot is not available". What can be done?

[Torsten.]

I don't know your backup application, but did you remove all related information for the removed disk?

Please post the results of:

# strings /etc/lvmtab
# vgdisplay -v vg00
# lvlnboot -v
# strings /stand/bootconf
# setboot

[Asif Sharif]

Use Ignite backup command to take OS backup.

Ignite-UX is a product bundled with HP-UX 11i that provides a process to create a bootable system recovery tape. The tape contains a boot area and an operating system archive. Should your root disk fail or corruption of the root disk take place, you can recover using the bootable system recovery tape.

make_tape_recovery is the Ignite-UX tool that is used to create the bootable system recovery tape. You could boot and restore from the system recovery tape and then use your system backup to fully restore the system.

#make_tape_recovery -x inc_entire=vg00

Regards,

[Dolphi]

I am using customize HP - OS (company specific HP-UX11i). I am using the command
#scbackup - for taking ignite backup, that requires two 40GB tapes. One for Ignite backup and the second for Full backup (contains application backup)of the server.
Soon I will display the output of the commands.

[Dolphi]

bbsnm01,sys,root #

bbsnm01,sys,root #

bbsnm01,sys,root # strings /etc/lvmtab

/dev/vg00

/dev/dsk/c2t0d0

/dev/dsk/c2t1d0

bbsnm01,sys,root # vgdisplay -v vg00

vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

--- Volume groups ---

VG Name /dev/vg00

VG Write Access read/write

VG Status available

Max LV 255

Cur LV 16

Open LV 16

Max PV 16

Cur PV 2

Act PV 1

Max PE per PV 5372

VGDA 2

PE Size (Mbytes) 64

Total PE 542

Alloc PE 530

Free PE 12

Total PVG 2

Total Spare PVs 0

Total Spare PVs in use 0



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

--- Logical volumes ---

LV Name /dev/vg00/lvol1

LV Status available/stale

LV Size (Mbytes) 128

Current LE 2

Allocated PE 4

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol2

LV Status available

LV Size (Mbytes) 2048

Current LE 32

Allocated PE 64

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol3

LV Status available/stale

LV Size (Mbytes) 256

Current LE 4

Allocated PE 8

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol4

LV Status available/stale

LV Size (Mbytes) 1216

Current LE 19

Allocated PE 38

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol5

LV Status available/stale

LV Size (Mbytes) 2304

Current LE 36

Allocated PE 72

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol6

LV Status available/stale

LV Size (Mbytes) 256

Current LE 4

Allocated PE 8

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol7

LV Status available/stale

LV Size (Mbytes) 1536

Current LE 24

Allocated PE 48

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol8

LV Status available/stale

LV Size (Mbytes) 768

Current LE 12

Allocated PE 24

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol9

LV Status available/stale

LV Size (Mbytes) 512

Current LE 8

Allocated PE 16

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol10

LV Status available/stale

LV Size (Mbytes) 384

Current LE 6

Allocated PE 12

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol11

LV Status available/stale

LV Size (Mbytes) 10752

Current LE 168

Allocated PE 336

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol12

LV Status available/stale

LV Size (Mbytes) 4736

Current LE 74

Allocated PE 148

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol13

LV Status available/stale

LV Size (Mbytes) 1216

Current LE 19

Allocated PE 38

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol14

LV Status available/stale

LV Size (Mbytes) 256

Current LE 4

Allocated PE 8

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol15

LV Status available

LV Size (Mbytes) 512

Current LE 8

Allocated PE 16

Used PV 1



vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

LV Name /dev/vg00/lvol16

LV Status available/stale

LV Size (Mbytes) 7040

Current LE 110

Allocated PE 220

Used PV 1





--- Physical volumes ---

PV Name /dev/dsk/c2t1d0

vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

vgdisplay: Warning: couldn't query all of the physical volumes.

PV Status available

Total PE 542

Free PE 12

Autoswitch On





--- Physical volume groups ---

PVG Name pvg0

PV Name /dev/dsk/c2t0d0



PVG Name pvg1

PV Name /dev/dsk/c2t1d0





bbsnm01,sys,root # lvlnboot -v

lvlnboot: Couldn't query physical volume "/dev/dsk/c2t0d0":

The specified path does not correspond to physical volume attached to

this volume group

bbsnm01,sys,root # strings /stand/bootconf

l /dev/dsk/c2t0d0

l /dev/dsk/c2t1d0

bbsnm01,sys,root # setboot

Primary bootpath : 0/1/1/0.1.0

Alternate bootpath : 0/1/1/0.0.0



Autoboot is ON (enabled)

Autosearch is ON (enabled)

In the last command, i have changed the booting path. Please suggest.

[Dolphi]

As far as make_tape_recovery is concerned I cannot use the recovery tape as earlier the server was running on different version (older verion of application running)and now it is running on the later release. And for the later release I dont have any backup. For the previous release I am having tape but that I cannot use now.Version in-compatibility.

[Anka]

Why dont you try to correct the lvm problem first and then see if the backup problem will be solved with this correction.
Do you need the mirror copy, or you can temporary reduce it.....

[Dolphi]

There are certain steps of commands like lvreduce and vgreduce to reduce the size. I am not sure about the whole procedure. If anybody knows the procedure please mention.

[Anka]

So there are 2 ways of solving the problem
1) Reduce the unwanted mirror copy
2) restore the configuration from the backup file if the disk is not failed
or replace the disk and restore the configuration if it has failed

1) /dev/vg00
/dev/dsk/c2t0d0 <- failed of with deleated header
/dev/dsk/c2t1d0

>> #vgdisplay shows:
Cur PV 2
Act PV 1

>> also all the logical volumes are in state stale because on of the mirror copies has failed

>> as i see all the lvols are mirrored but you can check it with #lvdisplay -v /dev/vg00/ | more

if you do not see the disk device file in the lvdisplay output but instead of it you see "???" then you should use the -k option when reducing the mirror copy:

>>#lvreduce -m 0 /dev/vg00/ /dev/dsk/c2t0d0
OR
>>#lvdisplay -kv /dev/vg00/ <- to check the pvkey of the disk
#lvreduce -m 0 -k /dev/vg00/

Then reduce the vg with the failed disk:
>> #vgreduce /dev/vg00 /dev/dsk/c2t0d0
OR
>> #vgreduce -f vg00
#mv /etc/lvmtab /etc/lvmtab.
#vgscan -v

check the lvmtab, vgdisplay, lvlnboot...
if the generating of the lvmtab fails for some reason you can restore back the old one

2) check if the disk is failed (syslog.log or dmesg... scsi errors or such things)
If just the header infos are somehow corrupt then restore it:

#vgcfgrestore -n /dev/vg00 -l <- to list the /etc/lvmcnf/vg00.conf file and check if the disks are as expected, if yes then you can do the following:
#pvchange -a n /dev/dsk/c2t0d0
#vgcfgrestore -n vg00 /dev/rdsk/c2t0d0
#vgchange -a y vg00

check with lvdisplay -v ... if the stale extents are being resynchronized...

[Anka]

forgot to mention that he option 2) can be done only if the OLAR introduction patches or later versions are installed on the system
They are lvm commands and cumulative patches.
Should check additionaly which exactly are they, but if you have the latest patches there will be no problem