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Re: [lvm] Howto resize LVM on GPT partition.



First you'll need to resize the partition, and after you'll need to
resize the filesystem you're currently using. LVM is made to be
resized; I wouldn't worry about that part. The part you have to watch
out for is resizing the filesystem. What FS are you using? If its ext2
you're going to run into some issues. Ext3 can be done live, as can
ext4 and XFS.

On Tue, May 10, 2011 at 6:40 PM, Geofrey Rainey
<Geofrey Rainey tvnz co nz> wrote:
> I've done 1. before and it works okay. Like you say, it's just a little
> scary modifying the partition table, but it works. I'd back up your data
> first though.
>
> -----Original Message-----
> From: redhat-list-bounces redhat com
> [mailto:redhat-list-bounces redhat com] On Behalf Of Soeren Grunewald
> Sent: Wednesday, 11 May 2011 2:43 a.m.
> To: General Red Hat Linux discussion list
> Subject: [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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