Failed disk in HP LVM volume group

[Nyck_1]

Hello,

I have a failed hard drive in a volume group, I have an enginner coming in tomorrow to replace the drive but could someone please remind me of the LVM syntax I need to perfrom during & after the drive swap?

Details of the volume group are below:-

VG Name                     /dev/vg_migration1

VG Write Access             read/write    

VG Status                   available                

Max LV                      255   

Cur LV                      1     

Open LV                     1     

Max PV                      16    

Cur PV                      1     

Act PV                      1     

Max PE per PV               4375        

VGDA                        2  

PE Size (Mbytes)            32             

Total PE                    4374   

Alloc PE                    3125   

Free PE                     1249   

Total PVG                   0       

Total Spare PVs             0             

Total Spare PVs in use      0                    

   --- Logical volumes ---

   LV Name                     /dev/vg_migration1/migration1

   LV Status                   available/syncd          

   LV Size (Mbytes)            100000         

   Current LE                  3125     

   Allocated PE                3125       

   Used PV                     1      

   --- Physical volumes ---

   PV Name                     /dev/dsk/c2t2d0

   PV Status                   unavailable             

   Total PE                    4374   

   Free PE                     1249   

   Autoswitch                  On       

   Proactive Polling           On              

Cheers

Nick

[Patrick Wallek]

This is a very good reference for dealing with disk failures.

When Good Disks Go Bad: Dealing with Disk Failures Under LVM

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01911837/c01911837.pdf

[Nyck_1]

Hello,

yes I have been looking at that but getting a bit confused as a bit rusty with HP-UX as you can probably tell. I was thinking that i would just remove the volume group completly and once the drive had been replaced just re-create it. The sytnax I'm planning on using is as follows. Does it look correct?

Delete an LV,

cd ~/

vgdisplay -v | grep Name

lvremove /dev/vg01/lvexample

write down the PV name, then delete a VG and its PV,

vgdisplay -v | grep Name

vgremove vg01

pvremove /dev/rdsk/c2t0d1

Cheers

Nick

[Nyck_1]

I have just tried the following and still no luck:-

vgexport -v /dev/vg_migration1
Beginning the export process on Volume Group "/dev/vg_migration1".
vgexport: Volume group "/dev/vg_migration1" is still active.
vgexport: Couldn't export volume group "/dev/vg_migration1".

[lonita8] # vgchange -a n /dev/vg_migration1

vgchange: Couldn't deactivate volume group "/dev/vg_migration1":
Device busy

[Torsten. · Accepted solution]

Do

pvchange -a n /dev/dsk/c2t2d0

replace the disk, do a vgcfgrestore and vgchange -a y ... and then you have the original LVM structure on this disk. Now do a newfs ... and restore the data, since the disk is not mirrored. 

[Nyck_1]

Hello,

all is now resolved and thanks to all who responded :-)

In the end I cheated a bit and just blew away all the failed volume groups as I wanted to re-create them but this time a bit smaller than they originally were.