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Remove Faulty disk from HP-UX LVM VG


 
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Operating Systems HP-UX Remove Faulty disk from HP-UX LVM VG
# 1  
Remove Faulty disk from HP-UX LVM VG

Requirement to remove a faulty mirrored disk from hp-ux LVM

Code:
<root@pdwp1s>/etc # vgdisplay -v /dev/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                      10
Open LV                     10
Max PV                      16
Cur PV                      3
Act PV                      2
Max PE per PV               4350
VGDA                        4
PE Size (Mbytes)            8
Total PE                    8680
Alloc PE                    7713
Free PE                     967
Total PVG                   0
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)            504
   Current LE                  63
   Allocated PE                126
   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/stale
   LV Size (Mbytes)            4096
   Current LE                  512
   Allocated PE                1536
   Used PV                     2

vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":
The specified path does not correspond to physical volume attached to
this volume group

Suggest a safest wasy to achieve this ...

Last edited by methyl; 02-09-2012 at 09:45 AM.. Reason: please use code tags
# 2  
Is this the same computer as the original computer in this post:
HP-UX server cloning

What output do you get from this "ioscan" enquiry:
Code:
ioscan -fnCdisk

Assuming this is one mirror of the system disc and you have physically removed the disc or corrupted it, this is a delicate sitution. The tactics depend on whether you want to replace the disc or permanently remove the disc. Because you are tempting fate with your cloning guesswork it has to be assumed that this is not a straightforward disc failure.

If you don't already have a copy of "When good disks go bad", then it is currently on this link. Well worth a read to help you consider your options:
http://bizsupport2.austin.hp.com/bc/.../c01911837.pdf

Based on your previous posts we assume that you have no backup of this system.
# 3  
No this is another set of server on which am testing the clone behaviors ..

Here what have did
# OS data alread in 1 mirrored state
# HAVE mirrored it to one more disk
# AND removed the third disk
# Then have run below script
Code:
# sh -x  lvmirr_b.sh
## cat lvmirr_b.sh
for i in 1 2 3 4 5 6 7 8 9
do
 # lvextend -m 1 /dev/vg00/lvol${i} /dev/dsk/c2t0d0    ## As have extended to  -m 2
 lvreduce -m 1 -A n -k  /dev/vg00/lvol${i} /dev/dsk/c2t0d0
done

# vgreduce -f  /dev/dsk/c2t0d0
# mv /etc/lvmtab /etc/lvmtab_9212
# vgscan -v 

### And now am getting above error 

### Below out for more desc..
 # lvdisplay -v /dev/vg00/lvol1
lvdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":
The specified path does not correspond to physical volume attached to
this volume group
lvdisplay: Warning: couldn't query all of the physical volumes.
--- Logical volumes ---
LV Name                     /dev/vg00/lvol1
VG Name                     /dev/vg00
LV Permission               read/write
LV Status                   available/stale
Mirror copies               1
Consistency Recovery        MWC
Schedule                    parallel
LV Size (Mbytes)            504
Current LE                  63
Allocated PE                126
Stripes                     0
Stripe Size (Kbytes)        0
Bad block                   off
Allocation                  strict/contiguous
IO Timeout (Seconds)        default

   --- Distribution of logical volume ---
   PV Name            LE on PV  PE on PV
   /dev/dsk/c2t2d0    63        63

   --- Logical extents ---
   LE    PV1                PE1   Status 1 PV2                PE2   Status 2
   00000 /dev/dsk/c2t2d0    00000 current  ???                00000 stale
   00001 /dev/dsk/c2t2d0    00001 current  ???                00001 stale
   00002 /dev/dsk/c2t2d0    00002 current  ???                00002 stale
.
.

--Shirish

Last edited by methyl; 02-09-2012 at 10:56 AM.. Reason: please use code tags
# 4  
Please post the ioscan requested in post #2. I suspect that you have pulled the wrong disc.
# 5  
Code:
# ioscan -funC disk
Class     I  H/W Path        Driver   S/W State   H/W Type     Description
===========================================================================
disk     41  0/0/1/1.0.0     sdisk    CLAIMED     DEVICE       HP 36.4GST336753LC
                            /dev/dsk/c1t0d0   /dev/rdsk/c1t0d0
disk      0  0/0/1/1.2.0     sdisk    CLAIMED     DEVICE       HP 36.4GST336753LC
                            /dev/dsk/c1t2d0   /dev/rdsk/c1t2d0
disk      1  0/0/2/0.2.0     sdisk    CLAIMED     DEVICE       HP 36.4GST336753LC
                            /dev/dsk/c2t2d0   /dev/rdsk/c2t2d0
disk      2  0/0/2/1.2.0     sdisk    CLAIMED     DEVICE       HP      DVD-ROM 305
                            /dev/dsk/c3t2d0   /dev/rdsk/c3t2d0
disk      3  0/10/0/0.1.0.0.0.0.0  sdisk    CLAIMED     DEVICE       HP      A6189B
                            /dev/dsk/c4t0d0   /dev/rdsk/c4t0d0


Last edited by methyl; 02-09-2012 at 12:05 PM.. Reason: code tags
# 6  
According to lvdisplay there is no sign of a second mirror, but it is behaving as if the single mirror to c2t0d0 has failed

Code:
lvreduce -m 1 -A n -k  /dev/vg00/lvol${i} /dev/dsk/c2t0d0

Why "-A n" ?
Why "-k" ?


I'm wondering whether you did not have any mirrors on this system and actually issued what is commented out in your script:
Code:
lvextend -m 1 /dev/vg00/lvol${i} /dev/dsk/c2t0d0


Last edited by methyl; 02-10-2012 at 10:26 AM.. Reason: c2t0d0 is not in ioscan. Remove errorneous comment.
# 7  
When I started mirroring the VG00 on my new disk, the system had already 2 disk in mirrored state ... At that time my mirror value was 1, so while mirroring 3rd disk have used -m 2 .. and my # lvlnboot -v shows all boot order without error .

Then have removed my 3rd disk directly.. without spilting or reducing vg ..

After that had ran above cmnds .. and get stuck .. As I understand now current state is my all mirrored got failed .. only 1 active boot disk is there ... it may be bcz have done wrong vg reduce or lvreduce .. Smilie

## Now what I want is to .. remove what error am getting then remirror this OS on second disk .. to safely handover this server ...

##########
Code:
lvreduce -m 1 -A n -k  /dev/vg00/lvol${i} /dev/dsk/c2t0d0
 
-A n ::  
Do not backup configuration changes after lvreduce .. 
-k:: IS to be used when your pv is missing (i.e disk is not there u had removed )

Had taken these args from source
http://h20000.www2.hp.com/bc/docs/su.../c02261098.pdf

Last edited by methyl; 02-10-2012 at 09:27 AM.. Reason: please use code tags

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