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тАО10-20-2004 02:54 AM
тАО10-20-2004 02:54 AM
Problem while extending the VG
I have HPUX clusters connected to XP512.
I have one VG which already in place. and I want to extend it.
While extending it gives following problem:
# vgextend /dev/cad /dev/dsk/c4t15d5
vgextend: Warning: Max_PE_per_PV for the volume group (3473) too small for this PV (8690).
Using only 3473 PEs from this physical volume.
Volume group "/dev/cad" has been successfully extended.
Volume Group configuration for /dev/cad has been saved in /etc/lvmconf/cad.conf
The size of the LUN is 34 GB (OPEN-L).
The details of VG is:
--- Volume groups ---
VG Name /dev/cad
VG Write Access read/write
VG Status available, exclusive
Max LV 255
Cur LV 1
Open LV 1
Max PV 16
Cur PV 8
Act PV 8
Max PE per PV 3473
VGDA 16
PE Size (Mbytes) 4
Total PE 27776
Alloc PE 25600
Free PE 2176
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0
TIA
Mahesh
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тАО10-20-2004 02:59 AM
тАО10-20-2004 02:59 AM
Re: Problem while extending the VG
you are running into the MX_PE per PV limit for the VG. This is a standard problem for unix admin in recent days.
A Look at this doc from itrc would be helpful in understanding the situation,
http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000063201757
The itrc doc id is KBRC00004285
Hope this helps.
Regds
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тАО10-20-2004 03:01 AM
тАО10-20-2004 03:01 AM
Re: Problem while extending the VG
It looks like the PVs that are already part of the volume group are of size 13.X GB. When the VG is created, MAX PE per PV is set to the biggest PV size added to the VG at the time of creation.
Now you could only use 4 * 3473 MB of 34 GB LUN you just added.
Are you running 11i or 11.0.
If 11i, I have an unsupported program that can help you increase the PE size or Max PE per PV without recreating the Volume group.
Only other option is to recreate the volume group with a bigger Max PE per PV value.
- Sundar.
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тАО10-20-2004 03:01 AM
тАО10-20-2004 03:01 AM
Re: Problem while extending the VG
Pete
Pete
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тАО10-20-2004 03:01 AM
тАО10-20-2004 03:01 AM
Re: Problem while extending the VG
For a 34GB LUN, you need to create a vg like so:
vgcreate -s 8 -p 128 /dev/vgXX /dev/dsk/cXtXdX
man vgcreate for more info
Rgds...Geoff
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тАО10-20-2004 03:02 AM
тАО10-20-2004 03:02 AM
Re: Problem while extending the VG
There is an enhancement request to allow this setting to be changed on-the-fly, but that has not been addressed yet.
You will have to recreate the volume group to accommodate the larger disks. Be sure to specify -e max_pe to allow for future growth beyond these disks.
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тАО10-20-2004 03:22 AM
тАО10-20-2004 03:22 AM
Re: Problem while extending the VG
Sundar : Can you please elaborate on the utility which can do the trick w/o recreating the VG.
Best Regards
Mahesh
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тАО10-20-2004 04:36 AM
тАО10-20-2004 04:36 AM
Re: Problem while extending the VG
Attached is the tool I was talking about. There are lot of pre-requisites that have to be met for the tool to succeed.
I would strongly recommend taking the complete backup of VG before using the tool.
also remember this tool is not supported by HP.
- Sundar.