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Undo vgextend

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Operating Systems HP-UX Undo vgextend
# 1  
Old 02-18-2010
Bug [Solved] Undo vgextend
Hi

I had extended one of the FS yesterday as rsync was failing and the temp solution was to extend it to 4GB while we worked on cron script.

Code:
spthrv01:/root# bdf /p05
Filesystem          kbytes    used   avail %used Mounted on
/dev/vg232/lvol1   130940928 82208608 48385792   63% /p05

spthrv01:/root# lvdisplay /dev/vg232/lvol1
--- Logical volumes ---
LV Name                     /dev/vg232/lvol1
VG Name                     /dev/vg232
LV Permission               read/write   
LV Status                   available/syncd           
Mirror copies               0            
Consistency Recovery        MWC                 
Schedule                    parallel     
LV Size (Mbytes)            127872          
Current LE                  3996      
Allocated PE                3996        
Stripes                     0       
Stripe Size (Kbytes)        0                   
Bad block                   NONE         
Allocation                  PVG-strict/distributed
IO Timeout (Seconds)        default             

###As you can see, there no PE left anymore:

spthrv01:/root# vgdisplay /dev/vg232
--- Volume groups ---
VG Name                     /dev/vg232
VG Write Access             read/write     
VG Status                   available                 
Max LV                      255    
Cur LV                      1      
Open LV                     1      
Max PV                      16     
Cur PV                      4      
Act PV                      4      
Max PE per PV               16000        
VGDA                        8   
PE Size (Mbytes)            32              
Total PE                    3996    
Alloc PE                    3996    
Free PE                     0       
Total PVG                   1        
Total Spare PVs             0              
Total Spare PVs in use      0                     

spthrv01:/root# date
Thu Feb 18 17:05:00 EDT 2010

this is what I have done yesterday:

Code:
lvextend -L 127872 /dev/vg232/lvol1

fsadm -F vxfs -b 127872M /p05

Please advise as to which command would be best used to undo the vgextend. vgreduce requires to take out the disk but theres tons of data there and i want them there...thanks in advance..
# 2  
Old 02-18-2010
vgreduce is to reduce a volume group not a logical volume and so the only way to do it is by removing a PV...
Your case has nothing to do with vgreduce (dont tell me you have a VG per FS...) but to reduce the logical volume:
1) Reduce, the FS with the same command :fsadm
2) lvreduce
e.g.
Code:
ant # fsadm -b 500000 /home
fsadm: /etc/default/fs is used for determining the file system type
vxfs fsadm: /dev/vg00/rlvol5 is currently 819200 sectors - size will be reduced
vxfs fsadm: allocations found in shrink range, moving data
ant # lvreduce -L 500 /dev/vg00/lvol5
Warning: rounding up logical volume size to extent boundary at size "504" MB.
When a logical volume is reduced useful data might get lost;
do you really want the command to proceed (y/n) : y
Logical volume "/dev/vg00/lvol5" has been successfully reduced.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
ant #

Last edited by vbe; 02-18-2010 at 09:25 AM.. Reason: typo...
# 3  
Old 02-18-2010
Your filesystem is actually 124 Gb (3996 x 32 Mb) not 4 GB. It is spread across the four 32 Gb discs which make up volume group vg232.

It is inadvisible to reduce a filesystem which contains data. Unless you particularly need to create another lvol in vg232 the large lvol1 would appear to be harmless.
# 4  
Old 02-18-2010
Thanks to methyl (I missed the PVG /striping) I realize you would have take in account the stripe size if you were to do the thing properly in order to free the same amount on all four disks...
I forgot to say : Although I never had issues in HP-UX with reducing LVM / FS, It is more than advisable to not forget to backup before...
Then you would need to reorganize the FS before to be sure there is nothing in the block you remove:
Code:
fsadm -F vxfs -D -d -E -e -s /p05

It takes some time (your remember DOS defragmentation?...)
# 5  
Old 02-18-2010
Very good advice vbe.
Even with Online JFS installed the operation is only worth considering on a totally quiescent Logical Volume and with a known good backup.
Personally I have never been able to determine the high water mark with 100% certainty and find it easier to create a replacement filesystem.
# 6  
Old 02-19-2010
Hi guys

I managed to undo the LVextend

Sorry, it wasn't VGextend

I did fsadm followed by lvreduce. It worked!

Thanks all!!
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