[linux-lvm] Mapping between PEs and Logical Volumes.

[linux-lvm] Mapping between PEs and Logical Volumes.

[fromkth+lvm]

Hi,

I have one Volume Group and it contains two Logical Volumes.
There are many free PEs in Volume Group.
I want to know which PEs inside a Physical Volume(Volume Group) are
assigned to which Logical Volume.

So which command shows this.


Thanks.

-ajeet.

Re: [linux-lvm] Mapping between PEs and Logical Volumes - Remapping of PEs in a Volume Group whic is on one PV

[Ajeet Nankani]

Ok i have figured it out that 
lvdisplay -m
command shows the mapping of PEs and Logical Volumes.
and in my case it shows that total PEs are 266 that means from 0 to 265,
allocated are 224 and 42 are free PEs

Logical Volume 0 is from 0 to 191 PEs = 192 PEs
and Logical Volume 1 is from 233 to 264 = 32 PEs 
so total is 224 PEs

and in between these 2 logical volumes 41 PEs(PE# 191 to 232) are free
and 1 PE (PE#265) is free at the end after 2nd logical Volume.
Now i want to be LogVols in VolGroup to be contiguous physically, such
that logical Volume 0 remains on 0 to 191 PEs and logical volume 1
should start from PE 192 and finishes at PE 223.

I figured it out that for this shuffling of PEs the command should be,

# pvmove -v /dev/hda6:233-264 /dev/hda6:192-223

which gives following error

Finding volume group "VolGroup00"
  No extents available for allocation

or 

# pvmove -v -n /dev/Volgroup00/logVol01 /dev/hda6 /dev/hda6:192-223

which gives following error

  Named LV and old PV must be in the same VG
  pvmove: Move extents from one physical volume to another

in both cases i cant figure out what is the problem as there are PEs
available and also LV and the "old PV" infact are in same VG.

I have also tried the simple command
# pvmove -v -n /dev/Volgroup00/logVol01
which does not give any error, but do nothing as the mapping remains
same.

anybody here to help me out?

-ajeet.





On Sun, 06 Feb 2005 07:44:25 -0800, fromkth+lvm@fastmail.fm said:
> Hi,
> 
> I have one Volume Group and it contains two Logical Volumes.
> There are many free PEs in Volume Group.
> I want to know which PEs inside a Physical Volume(Volume Group) are
> assigned to which Logical Volume.
> 
> So which command shows this.
> 
> 
> Thanks.
> 
> -ajeet.
> 

Re: [linux-lvm] Mapping between PEs and Logical Volumes.

[James Parsons]

fromkth+lvm@fastmail.fm wrote:

>Hi,
>
>I have one Volume Group and it contains two Logical Volumes.
>There are many free PEs in Volume Group.
>I want to know which PEs inside a Physical Volume(Volume Group) are
>assigned to which Logical Volume.
>
>So which command shows this.
>  
>
There is a GUI for LVM2 that is included in the latest Fedora release 
called system-config-lvm that visually displays the mapping between PVs 
and LVs. Here is the rpmfind URL:

http://fr.rpmfind.net/linux/RPM/fedora/devel/x86_64/system-config-lvm-0.9.18-1.1.noarch.html

system-config-lvm has undergone a couple of rounds of QA. It will NOT 
work with the very latest (lvm2-2.01.03-1.0)  LVM2 package, due to a 
path issue discovered today and being addressed now, but will work just 
fine between lvm2-2.00.25-1.01 and the version listed above.

This version of system-config-lvm is the first GA version. It is under 
active development, and near term planned features include support for 
snapshotting and resizing, as well as fixes for some UI nits. Try it 
out, and please report any bugs you find or features/changes you would 
like to see.

Regards,

-Jim Parsons