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[lvm] Howto resize LVM on GPT partition.



Hi All,

We had a RHEL5.6 server which was installed with default settings on a HW raid system. The raid was originally setup as raid1 with 2x2TB. Soon we run out of storage, so we migrate to raid5. Now we have ~4TB, but can't access the storage, because MBR supports only partitions up to 2TB.

So I've converted the MBR to GPT and fixed grub to boot again. That was quite easy (following http://www.rodsbooks.com/gdisk/mbr2gpt.html).

But now i need to resize the physical LVM partition. And this is something which makes me nervous.

Normally i would use fdisk to delete part2 and recreate it. Using parted and resize command does not work because it is a LVM partition. and mkpart does not know LVM as partition type too.

Finally i can use pvresize, but i have no idea if pvresize is working correctly with GPT partitions and/or partitions size > 2TB.

In the end i have 2 options.
 1) try pvresize and pray
    - the way it should be, but scary
 2) create a new LVM partition and add it to the volume group.
    - uncool

So has anyone here done something before or any other ideas/comments?

Below some print outs which might be helpful.

parted:

Model: AMCC 9690SA-4I DISK (scsi)
Disk /dev/sda: 4000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name                Flags
 1      32.3kB  107MB   107MB   ext3         Linux/Windows data
 2      107MB   2000GB  2000GB               Linux LVM           lvm

pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               VolGroup00
  PV Size               1.82 TB / not usable 225.00 KB
  Allocatable           yes
  PE Size (KByte)       32768
  Total PE              59601
  Free PE               1
  Allocated PE          59600
  PV UUID               C0dkqJ-QObR-qx8I-EQZh-LV65-w2Df-nFJhw

lvdisplay
  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol00
  VG Name                VolGroup00
  LV UUID                lBPFKP-OYX9-rPVU-f2RN-iO4q-Z9LP-RyFbUs
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.81 TB
  Current LE             59351
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol01
  VG Name                VolGroup00
  LV UUID                1uJ9kD-l9WD-gEjQ-grAz-uppa-Un3d-HijG6w
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                7.78 GB
  Current LE             249
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1


--
Kind regards,
Soeren



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