[linux-lvm] Mapping between PEs and Logical Volumes - Remapping ofP Es in a Volume Group which is on one PV

[Ajeet Nankani]

On Sun, 06 Feb 2005 10:20:05 -0800, fromkth+lvm at fastmail.fm said:
> 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?


After reading archives i findout that this command may help which infact
worked.

# pvmove -v --alloc anywhere /dev/hda6:233-164 /dev/hda6:192-223

but this --alloc option is not mentioned in man page!!
also does anybody know what other options(Allocation Type) can be used
with --alloc?


> 
> -ajeet.
> 
> On Sun, 06 Feb 2005 07:44:25 -0800, fromkth+lvm at 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.
> >