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Old 03-20-2014, 11:09 PM   #1
Ashish Sood
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Registered: Feb 2009
Location: Gwalior
Distribution: Fedora 22, RHEL 6,7
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Increasing PE Size


Hi All,

I am trying to increase the physical extent size of my volume group, but its seems not working for me. when i try to increase my VG size its gave me error message
New extent size is not a perfect fit

Please find the detail of my volume group

[vgdisplay]

Quote:
--- Volume group ---
VG Name test
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 9
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 2.81 GB
PE Size 4.00 MB
Total PE 719
Alloc PE / Size 256 / 1.00 GB
Free PE / Size 463 / 1.81 GB
VG UUID VflmfG-OZPg-ADb8-3zXq-L1AX-3vsX-ykh4qE

[vgchange]

Quote:
[root@localhost ~]# vgchange -s 32M test
New extent size is not a perfect fit


Please tell me where i am wrong & what method do i need to follow to make it work.

Thanks in advance
Ashish
 
Old 03-21-2014, 05:16 AM   #2
chrism01
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Registered: Aug 2004
Location: Sydney
Distribution: Centos 7.7 (?), Centos 8.1
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http://linux.die.net/man/8/vgchange


Code:
 echo '719*4'|bc
2876

 echo 'scale=5;2876/32'|bc
89.87500
 
Old 03-22-2014, 12:16 PM   #3
Ashish Sood
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Registered: Feb 2009
Location: Gwalior
Distribution: Fedora 22, RHEL 6,7
Posts: 180

Original Poster
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Thanks for your reply Chris,
But it will be really helpful if you explain it, I went through that link but the same manual page is there which not helpful.
 
Old 03-24-2014, 05:18 AM   #4
chrism01
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Quote:
New extent size is not a perfect fit
It does need to be an exact fit; you can't have a partial extent
 
Old 03-27-2014, 12:04 AM   #5
Ashish Sood
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Registered: Feb 2009
Location: Gwalior
Distribution: Fedora 22, RHEL 6,7
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Thanks for your reply Chris

My question is still there how we can calculate the PE, what's is the formula's of it.
 
Old 03-27-2014, 07:44 AM   #6
grim76
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I would think that it would be the space you have in MB/<size of extent>. That should give you what you are looking for.
 
  


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