CentOS - Feb 2017 - how to resize a partition of a disk define as a physical volume

How do you resize the partition without loosing data?

gparted does not support LVM.



On Wed, Feb 22, 2017 at 8:37 AM, SysAdmin <admin at s-s.network> wrote:
> Hi,
>
> you need to resize partition /dev/xvda2, afterwards resize pv.
>
> Regards,
> Holger
>
> > -----Urspr?ngliche Nachricht-----
> > Von: CentOS [mailto:centos-bounces at centos.org] Im Auftrag von
Bernard
> > Fay
> > Gesendet: Mittwoch, 22. Februar 2017 14:18
> > An: CentOS mailing list
> > Betreff: Re: [CentOS] how to resize a partition of a disk define as a
> > physical volume
> >
> > I should have added the output of pvs:
> >
> > [root ~]# pvs
> >   PV         VG          Fmt  Attr PSize PFree
> >   /dev/xvda2 cl_vm731611 lvm2 a--  9.00g    0
> >
> > PFree still show 0. It should show 5g.
> >
> > Also:
> > [root ~]# pvdisplay /dev/xvda2
> >   --- Physical volume ---
> >   PV Name               /dev/xvda2
> >   VG Name               cl_vm731611
> >   PV Size               9.00 GiB / not usable 2.00 MiB
> >   Allocatable           yes (but full)
> >   PE Size               4.00 MiB
> >   Total PE              2303
> >   Free PE               0
> >   Allocated PE          2303
> >   PV UUID               RtXa0c-07RP-RJ0V-kSjC-Tuo0-5QQv-sQIKlr
> >
> >
> > With fdisk, we can see the additional space has is there as it shows
> > 16GB.
> > The original disk had 10GB.
> > [root ~]# fdisk  -l /dev/xvda
> >
> > Disk /dev/xvda: 16.1 GB, 16106127360 bytes, 31457280 sectors [snip]
> >
> >     Device Boot      Start         End      Blocks   Id  System
> > /dev/xvda1   *        2048     2099199     1048576   83  Linux
> > /dev/xvda2         2099200    20971519     9436160   8e  Linux LVM
> >
> >
> > vgs also shows 0 Free PE:
> > [root at CTSSVN01 ~]# vgs
> >   VG          #PV #LV #SN Attr   VSize VFree
> >   cl_vm731611   1   2   0 wz--n- 9.00g    0
> >
> >
> > Thanks,
> >
> >
> > On Wed, Feb 22, 2017 at 8:06 AM, Jon LaBadie <jcu at labadie.us>
wrote:
> >
> > > On Wed, Feb 22, 2017 at 07:44:33AM -0500, Bernard Fay wrote:
> > > > Hello,
> > > >
> > > > I have a CentOS VM with only one disk on a Xenserver.
> > > >
> > > > The disk has 2 partitions:
> > > >
> > > > /dev/xvda1 -> /boot
> > > > /dev/xvda2 -> a physical volume for LVM
> > > >
> > > >
> > > > I added 5GB to this disk via Xencenter to extend /dev/xvda2.
> > > > Usually I just have to do "pvresize /dev/xvda" to
have the
> > > > additional space added
> > > to
> > > > the disk. But for some reason it does not work for this
disk.
> > > >
> > > > [root ~]# pvresize /dev/xvda
> > > >   Failed to find physical volume "/dev/xvda".
> > > >   0 physical volume(s) resized / 0 physical volume(s) not
resized
> > > >
> > > > [root ~]# pvresize /dev/xvda2
> > > >   Physical volume "/dev/xvda2" changed
> > > >   1 physical volume(s) resized / 0 physical volume(s) not
resized
> > > >
> > > >
> > > > Does someone have seen this problem before or could have an
idea of
> > > > the problem?
> > >
> > > Looks like xvda2 was resized.  You should now have an added 5GB
worth
> > > of unallocated extents in the vg
> > >
> > > --
> > > Jon H. LaBadie                 jon at jgcomp.com
> > >  11226 South Shore Rd.          (703) 787-0688 (H)
> > >  Reston, VA  20190              (703) 935-6720 (C)
> > > _______________________________________________
> > > CentOS mailing list
> > > CentOS at centos.org
> > > https://lists.centos.org/mailman/listinfo/centos
> > >
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > https://lists.centos.org/mailman/listinfo/centos
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>

On Wed, Feb 22, 2017 at 2:42 PM, Bernard Fay <bernard.fay at gmail.com>
wrote:
> How do you resize the partition without loosing data?
>
> gparted does not support LVM.
>
>
It is preferrable to create PV on the whole disk also to manage these kind
of situations.
In case I have to manage with partitions, the must is that you can do it
only if it is the last partition, and you are ok.
Normally I use fidsk and I first delete the last partition and then without
exiting the utility I create again it using the same starting point and the
new larger end.
For this, take care of using option to show sectors and not cylinders
("u"
switches between the two options) and print your partition layout ("p"
comamnd), so that you can set exactly the same starting point of the new
xvda2 partition otherwise you will have destroyed it and LVM layer would
not be able to identify it (also the type if now it is 8e for Linux LVM).
Eventually you will have to run also the command

partprobe /dev/xvda

to align os with new partition layout

Take care and read well (also on other sources on internet in case). Also
backup your partiion layout before making changes with

sfdisk -d /dev/xvda > part_table.before

and compare with what you have after.

HIH,
Gianluca

I usually use the whole disk a PV but this disk has the /boot partition
which cannot be LVM.

I decided to simply use the third partition as another PV and extended the
VG.

Thanks,



On Wed, Feb 22, 2017 at 8:52 AM, Gianluca Cecchi <gianluca.cecchi at
gmail.com>
wrote:
> On Wed, Feb 22, 2017 at 2:42 PM, Bernard Fay <bernard.fay at
gmail.com>
> wrote:
>
> > How do you resize the partition without loosing data?
> >
> > gparted does not support LVM.
> >
> >
> It is preferrable to create PV on the whole disk also to manage these kind
> of situations.
> In case I have to manage with partitions, the must is that you can do it
> only if it is the last partition, and you are ok.
> Normally I use fidsk and I first delete the last partition and then without
> exiting the utility I create again it using the same starting point and the
> new larger end.
> For this, take care of using option to show sectors and not cylinders
("u"
> switches between the two options) and print your partition layout
("p"
> comamnd), so that you can set exactly the same starting point of the new
> xvda2 partition otherwise you will have destroyed it and LVM layer would
> not be able to identify it (also the type if now it is 8e for Linux LVM).
> Eventually you will have to run also the command
>
> partprobe /dev/xvda
>
> to align os with new partition layout
>
> Take care and read well (also on other sources on internet in case). Also
> backup your partiion layout before making changes with
>
> sfdisk -d /dev/xvda > part_table.before
>
> and compare with what you have after.
>
> HIH,
> Gianluca
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>

On Wed, 22 Feb 2017, Gianluca Cecchi wrote:
> On Wed, Feb 22, 2017 at 2:42 PM, Bernard Fay <bernard.fay at
gmail.com> wrote:
>
>> How do you resize the partition without loosing data?
>>
>> gparted does not support LVM.
If you don't trust yourself to do it right, just create a new partition on
the
disk, pvcreate it, add it to the existing volume group.

jh

Bernard Fay wrote:
> How do you resize the partition without loosing data?
>
> gparted does not support LVM.
Dunno 'bout gparted, but parted->t, if you ask for help, it lists types,
and linux lvm is one type. A quick search tells me partition type e1.

       mark
>
>
>
> On Wed, Feb 22, 2017 at 8:37 AM, SysAdmin <admin at s-s.network>
wrote:
>
>> Hi,
>>
>> you need to resize partition /dev/xvda2, afterwards resize pv.
>>
>> Regards,
>> Holger
>>
>> > -----Urspr?ngliche Nachricht-----
>> > Von: CentOS [mailto:centos-bounces at centos.org] Im Auftrag von
Bernard
>> > Fay
>> > Gesendet: Mittwoch, 22. Februar 2017 14:18
>> > An: CentOS mailing list
>> > Betreff: Re: [CentOS] how to resize a partition of a disk define
as a
>> > physical volume
>> >
>> > I should have added the output of pvs:
>> >
>> > [root ~]# pvs
>> >   PV         VG          Fmt  Attr PSize PFree
>> >   /dev/xvda2 cl_vm731611 lvm2 a--  9.00g    0
>> >
>> > PFree still show 0. It should show 5g.
>> >
>> > Also:
>> > [root ~]# pvdisplay /dev/xvda2
>> >   --- Physical volume ---
>> >   PV Name               /dev/xvda2
>> >   VG Name               cl_vm731611
>> >   PV Size               9.00 GiB / not usable 2.00 MiB
>> >   Allocatable           yes (but full)
>> >   PE Size               4.00 MiB
>> >   Total PE              2303
>> >   Free PE               0
>> >   Allocated PE          2303
>> >   PV UUID               RtXa0c-07RP-RJ0V-kSjC-Tuo0-5QQv-sQIKlr
>> >
>> >
>> > With fdisk, we can see the additional space has is there as it
shows
>> > 16GB.
>> > The original disk had 10GB.
>> > [root ~]# fdisk  -l /dev/xvda
>> >
>> > Disk /dev/xvda: 16.1 GB, 16106127360 bytes, 31457280 sectors
[snip]
>> >
>> >     Device Boot      Start         End      Blocks   Id  System
>> > /dev/xvda1   *        2048     2099199     1048576   83  Linux
>> > /dev/xvda2         2099200    20971519     9436160   8e  Linux LVM
>> >
>> >
>> > vgs also shows 0 Free PE:
>> > [root at CTSSVN01 ~]# vgs
>> >   VG          #PV #LV #SN Attr   VSize VFree
>> >   cl_vm731611   1   2   0 wz--n- 9.00g    0
>> >
>> >
>> > Thanks,
>> >
>> >
>> > On Wed, Feb 22, 2017 at 8:06 AM, Jon LaBadie <jcu at
labadie.us> wrote:
>> >
>> > > On Wed, Feb 22, 2017 at 07:44:33AM -0500, Bernard Fay wrote:
>> > > > Hello,
>> > > >
>> > > > I have a CentOS VM with only one disk on a Xenserver.
>> > > >
>> > > > The disk has 2 partitions:
>> > > >
>> > > > /dev/xvda1 -> /boot
>> > > > /dev/xvda2 -> a physical volume for LVM
>> > > >
>> > > >
>> > > > I added 5GB to this disk via Xencenter to extend
/dev/xvda2.
>> > > > Usually I just have to do "pvresize /dev/xvda"
to have the
>> > > > additional space added
>> > > to
>> > > > the disk. But for some reason it does not work for this
disk.
>> > > >
>> > > > [root ~]# pvresize /dev/xvda
>> > > >   Failed to find physical volume "/dev/xvda".
>> > > >   0 physical volume(s) resized / 0 physical volume(s)
not resized
>> > > >
>> > > > [root ~]# pvresize /dev/xvda2
>> > > >   Physical volume "/dev/xvda2" changed
>> > > >   1 physical volume(s) resized / 0 physical volume(s)
not resized
>> > > >
>> > > >
>> > > > Does someone have seen this problem before or could have
an idea
>> of
>> > > > the problem?
>> > >
>> > > Looks like xvda2 was resized.  You should now have an added
5GB
>> worth
>> > > of unallocated extents in the vg
>> > >
>> > > --
>> > > Jon H. LaBadie                 jon at jgcomp.com
>> > >  11226 South Shore Rd.          (703) 787-0688 (H)
>> > >  Reston, VA  20190              (703) 935-6720 (C)
>> > > _______________________________________________
>> > > CentOS mailing list
>> > > CentOS at centos.org
>> > > https://lists.centos.org/mailman/listinfo/centos
>> > >
>> > _______________________________________________
>> > CentOS mailing list
>> > CentOS at centos.org
>> > https://lists.centos.org/mailman/listinfo/centos
>>
>> _______________________________________________
>> CentOS mailing list
>> CentOS at centos.org
>> https://lists.centos.org/mailman/listinfo/centos
>>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>