[linux-lvm] Mapping between PEs and Logical Volumes - Remapping ofP Es in a Volume Group which is on one PV
Ajeet Nankani
fromkth+lvm at fastmail.fm
Sun Feb 6 19:04:06 UTC 2005
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.
> >
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