[linux-lvm] Freeing space on a LVM for other partitions

Fri Feb 10 19:37:00 UTC 2006

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Richard Blumel wrote:

> I currently have this setup on a hw raid 0+1
>
> [root at cranium][pts/2]:~# fdisk -l
>
> Disk /dev/sda: 320.0 GB, 320073629696 bytes
> 255 heads, 63 sectors/track, 38913 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 3732 29977258+ 7 HPFS/NTFS
> /dev/sda2 3860 5076 9775552+ 83 Linux
> /dev/sda3 5077 38913 271795702+ 83 Linux
> /dev/sda4 3733 3859 1020127+ 5 Extended
> /dev/sda5 3733 3859 1020096 82 Linux swap /
> Solaris
>
>
> [root at cranium][pts/2]:~# vgdisplay
> --- Volume group ---
> VG Name raid01
> System ID
> Format lvm2
> Metadata Areas 1
> Metadata Sequence No 6
> VG Access read/write
> VG Status resizable
> MAX LV 0
> Cur LV 4
> Open LV 4
> Max PV 0
> Cur PV 1
> Act PV 1
> VG Size 259.20 GB
> PE Size 4.00 MB
> Total PE 66356[root at cranium][pts/2]:~# lvdisplay
> --- Logical volume ---
> LV Name /dev/raid01/usr
> VG Name raid01
> LV UUID khBZSv-3q6S-OKeX-NHJz-PdC5-FK9C-or6BDb
> LV Write Access read/write
> LV Status available
> # open 1
> LV Size 15.00 GB
> Current LE 3840
> Segments 1
> Allocation inherit
> Read ahead sectors 0
> Block device 254:0
>
> --- Logical volume ---
> LV Name /dev/raid01/var
> VG Name raid01
> LV UUID gxbp4O-pL6I-Ye5o-Yvqp-nrmB-7Q51-8psyn2
> LV Write Access read/write
> LV Status available
> # open 1
> LV Size 5.00 GB
> Current LE 1280
> Segments 1
> Allocation inherit
> Read ahead sectors 0
> Block device 254:1
>
> --- Logical volume ---
> LV Name /dev/raid01/tmp
> VG Name raid01
> LV UUID awX51K-guHb-oAbZ-mvnd-SBg0-YM87-IR5BXQ
> LV Write Access read/write
> LV Status available
> # open 1
> LV Size 1.00 GB
> Current LE 256
> Segments 1
> Allocation inherit
> Read ahead sectors 0
> Block device 254:2
>
> --- Logical volume ---
> LV Name /dev/raid01/home
> VG Name raid01
> LV UUID R6ZBTP-y7LF-1pGl-u1be-lFx4-G31b-qZuCLU
> LV Write Access read/write
> LV Status available
> # open 1
> LV Size 208.20 GB
> Current LE 53300
> Segments 1
> Allocation inherit
> Read ahead sectors 0
> Block device 254:3
>
> Alloc PE / Size 58676 / 229.20 GB
> Free PE / Size 7680 / 30.00 GB
> VG UUID Md0gWC-47Kj-CAft-W9D8-G420-tzQl-34sMBk
>
>
> What I want to do is shrink the /dev/sda3 partition which is lvm, not
> sure why is says just link but eh. Once shrunk I am going to grow the
> ntfs partition which I know how todo. My problem is most of the howto
> talk about moving pv to remove pv so forth. I saw one post that said
> what I am trying todo is voodoo and dangerous but recommend that to
> move the PE towards one edge of the disk us --alloc anywhere however I
> have seen other documents that say that is not implemented yet. I hope
> I haven't lost you guys but if you know what I should I would be
> greatly in your debt.

Ok I solved this problem on my own and I am sure other people want to
know how I did it. Once I used pvresize to shrink the pv I was left
with a partition that was 20G bigger than I wanted to use and I wanted
to reclaim that 20G for my ntfs partition. I assumed that I could use
parted to resize this down, I was wrong. So what I did was delete the
partition in fdisk and then made a new partition that had the same
start but 20G short on the end. Like I said I assumed that this space
was completely unused. I had a backup of my data cause of a raid 0+1
that I failed out raid 1.  This worked and I now have

[root at cranium][pts/1]:~# fdisk  -l

Disk /dev/sda: 320.0 GB, 320073629696 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        6201    49809501    7  HPFS/NTFS
/dev/sda2            6329        7545     9775552+  83  Linux
/dev/sda3            7546       38913   251963460   83  Linux
/dev/sda4            6202        6328     1020127+   f  W95 Ext'd (LBA)
/dev/sda5            6202        6328     1020096   82  Linux swap /
Solaris

I orig had a problem with the space being at the end and I could use
it their. So I used partition magic 8.0 and moved all the data over by
20G. This took 12hrs... heh. All my data is intact so I reconstructed
my raid 1. Good times. I cant believe this worked, it was voodoo.
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