[lvm] Howto resize LVM on GPT partition.
Matty Sarro
msarro at gmail.com
Wed May 11 00:09:17 UTC 2011
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 at 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 at redhat.com
> [mailto:redhat-list-bounces at 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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