[linux-lvm] How can I expand a physical volume ?

[linux-lvm] How can I expand a physical volume ?

[Massimiliano]

Hi !
My first post here !
I've recently added a fourth Scsi Hard disk to my
Proliant ML350 configured as follow :
SmartArray Controller 641 with 3 72Gb Scsi h.disks.(raid5)
I installed on my Centos 4.2 the HP Array configuration Utility and did 
the following steps:
1) Expanded my array
2) Expanded my logical Volume
Everything ok . Now I can see 4 physical drives
and a new total space increased of 72gb(obviously..)
The problem is that the operating doesen't seem to recognize the new 
free space .
Here is the output of various command I tried :
--LVDISPLAY
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID 0QlVVm-W4ZY-tSLv-syu6-qS6J-b2u9-2Ed13l
LV Write Access read/write
LV Status available
# open 1
LV Size 133,56 GB
Current LE 4274
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:0
********************
FDISK -l
Disk /dev/cciss/c0d0: 218.5 GB, 218501038080 bytes
255 heads, 63 sectors/track, 26564 cylinders
Units = cilindri of 16065 * 512 = 8225280 bytes

Dispositivo Boot Start End Blocks Id System
/dev/cciss/c0d0p1 * 1 13 104391 83 Linux
/dev/cciss/c0d0p2 14 17709 142143120 8e Linux LVM
**********************************
root@mail init.d]# pvdisplay
--- Physical volume ---
PV Name /dev/cciss/c0d0p2
VG Name VolGroup00
PV Size 135,53 GB / not usable 0
Allocatable yes
PE Size (KByte) 32768
Total PE 4337
Free PE 1
Allocated PE 4336
PV UUID XAEWQR-s1qj-Cj5K-gv0W-9ndt-lroN-35ZvNE
..........
[root@mail init.d]# vgdisplay -v
Finding all volume groups
Finding volume group "VolGroup00"
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 135,53 GB
PE Size 32,00 MB
Total PE 4337
Alloc PE / Size 4336 / 135,50 GB
Free PE / Size 1 / 32,00 MB
VG UUID hVHrwV-Dt53-wbGa-ZwHQ-ZWcX-t5Tm-vQIVUu

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID 0QlVVm-W4ZY-tSLv-syu6-qS6J-b2u9-2Ed13l
LV Write Access read/write
LV Status available
# open 1
LV Size 133,56 GB
Current LE 4274
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:0

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol01
VG Name VolGroup00
LV UUID Apww83-TFLq-KqM9-zwEt-zPAW-a3J8-EPP8j7
LV Write Access read/write
LV Status available
# open 1
LV Size 1,94 GB
Current LE 62
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:1

--- Physical volumes ---
PV Name /dev/cciss/c0d0p2
PV UUID XAEWQR-s1qj-Cj5K-gv0W-9ndt-lroN-35ZvNE
PV Status allocatable
Total PE / Free PE 4337 / 1

It's clear that I have to expand the physical space but the only command 
I know ,PVRESIZE,
is not yet implemented but I know there is a workaround for it .
My last idea is to backup data and reinstall everything but , honestly , 
I'd prefer an alternative
solution . Consider that this server is already working in a production 
environment......
The workaround is based on using vgcfgbackup , edit the config file and 
vgcfgrestore . I know it's
a very dangerous operation and since I'm a very newbie to linux , I 
couldn't understand how
to modify the parameter pe_count (as indicated by the workaround) of the 
backed up
/etc/lvm/backup/VolGroup00 file . Here below u'll find the content of 
the above mentioned file.
How should I modify the pe_count value in order to use these added 72Gbs 
of new free space ?
Many many thanks in advance .
Max ( Italy )
*******************
# Generated by LVM2: Wed Dec 21 11:50:55 2005

contents = "Text Format Volume Group"
version = 1

description = "Created *after* executing 'vgcfgbackup'"

creation_host = "mail.laferspa.com"    # Linux mail.laferspa.com 
2.6.9-22.0.1.ELsmp #1 SMP Thu Oct 27 13:14:25 CDT 2005 i686
creation_time = 1135162255    # Wed Dec 21 11:50:55 2005

VolGroup00 {
  id = "hVHrwV-Dt53-wbGa-ZwHQ-ZWcX-t5Tm-vQIVUu"
  seqno = 3
  status = ["RESIZEABLE", "READ", "WRITE"]
  extent_size = 65536        # 32 Megabytes
  max_lv = 0
  max_pv = 0

  physical_volumes {

      pv0 {
          id = "XAEWQR-s1qj-Cj5K-gv0W-9ndt-lroN-35ZvNE"
          device = "/dev/cciss/c0d0p2"    # Hint only

          status = ["ALLOCATABLE"]
          pe_start = 384
          pe_count = 4337    # 135,531 Gigabytes
      }
  }

  logical_volumes {

      LogVol00 {
          id = "0QlVVm-W4ZY-tSLv-syu6-qS6J-b2u9-2Ed13l"
          status = ["READ", "WRITE", "VISIBLE"]
          segment_count = 1

          segment1 {
              start_extent = 0
              extent_count = 4274    # 133,562 Gigabytes

              type = "striped"
              stripe_count = 1    # linear

              stripes = [
                  "pv0", 0
              ]
          }
      }

      LogVol01 {
          id = "Apww83-TFLq-KqM9-zwEt-zPAW-a3J8-EPP8j7"
          status = ["READ", "WRITE", "VISIBLE"]
          segment_count = 1

          segment1 {
              start_extent = 0
              extent_count = 62    # 1,9375 Gigabytes

              type = "striped"
              stripe_count = 1    # linear

              stripes = [
                  "pv0", 4274
              ]
          }
      }
  }
}

Re: [linux-lvm] How can I expand a physical volume ?

[Matthew Gillen]

Massimiliano wrote:
> Hi !
> My first post here !
> I've recently added a fourth Scsi Hard disk to my
> Proliant ML350 configured as follow :
> SmartArray Controller 641 with 3 72Gb Scsi h.disks.(raid5)
> I installed on my Centos 4.2 the HP Array configuration Utility and did
> the following steps:
> 1) Expanded my array
> 2) Expanded my logical Volume
> Everything ok . Now I can see 4 physical drives
> and a new total space increased of 72gb(obviously..)
> The problem is that the operating doesen't seem to recognize the new
> free space .

If by "operating system", you mean that the filesystem isn't any bigger,
then all you need to do is re-size the filesystem (using 'resize2fs') to
take advantage of the new space.

> **********************************
> root@mail init.d]# pvdisplay
> --- Physical volume ---
> PV Name /dev/cciss/c0d0p2
> VG Name VolGroup00
> PV Size 135,53 GB / not usable 0
Ok.

> [root@mail init.d]# vgdisplay -v
> Finding all volume groups
> Finding volume group "VolGroup00"
> --- Volume group ---
> VG Name VolGroup00
> Alloc PE / Size 4336 / 135,50 GB
> Free PE / Size 1 / 32,00 MB
So all your PE's are allocated, and I think you're all set to do the
filesystem re-size.  I don't think you want to be messing with pvresize.

--Matt

Re: [linux-lvm] How can I expand a physical volume ?

[Luca Berra]

On Thu, Dec 29, 2005 at 09:12:53AM +0100, Massimiliano wrote:
>Hi !

two ways, either create a new partition with the free space,
pvcreate it and vgextend your volume group
or
edit your partition table and make the 2nd partition bigger.
(you might need to reboot here)
then 

>How should I modify the pe_count value in order to use these added 72Gbs 
>of new free space ?

>*******************
># Generated by LVM2: Wed Dec 21 11:50:55 2005
>
>contents = "Text Format Volume Group"
>version = 1
>
>description = "Created *after* executing 'vgcfgbackup'"
>
>creation_host = "mail.laferspa.com"    # Linux mail.laferspa.com 
>2.6.9-22.0.1.ELsmp #1 SMP Thu Oct 27 13:14:25 CDT 2005 i686
>creation_time = 1135162255    # Wed Dec 21 11:50:55 2005
>
>VolGroup00 {
>  id = "hVHrwV-Dt53-wbGa-ZwHQ-ZWcX-t5Tm-vQIVUu"
>  seqno = 3
>  status = ["RESIZEABLE", "READ", "WRITE"]
>  extent_size = 65536        # 32 Megabytes
^ this is how big is an extent in sectors (512 byte units)
>  max_lv = 0
>  max_pv = 0
>
>  physical_volumes {
>
>      pv0 {
>          id = "XAEWQR-s1qj-Cj5K-gv0W-9ndt-lroN-35ZvNE"
>          device = "/dev/cciss/c0d0p2"    # Hint only
>
>          status = ["ALLOCATABLE"]
>          pe_start = 384
>          pe_count = 4337    # 135,531 Gigabytes
this is the number of extents your physical volume is 
the size in sectors is pe_count * extent_size (4337 * 65536 = 284229632)
now look at /proc/partitions.
you have the size in bytes for your partition
multiply it by 2 and divide it by extent_size, and you get the new pe
count



-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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Re: [linux-lvm] How can I expand a physical volume ?

[Massimiliano]

Luca Berra ha scritto:

> On Thu, Dec 29, 2005 at 09:12:53AM +0100, Massimiliano wrote:
>
>> Hi !
>
>
> two ways, either create a new partition with the free space,
> pvcreate it and vgextend your volume group
> or
> edit your partition table and make the 2nd partition bigger.
> (you might need to reboot here)
> then

Did what you suggested (following the first solution) . Now vgdisplay 
shows me :
VG Name               VolGroup00
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  12
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               203,34 GB
  PE Size               32,00 MB
  Total PE              6507
  Alloc PE / Size       4336 / 135,50 GB
  Free  PE / Size       2171 / 67,84 GB
  VG UUID               hVHrwV-Dt53-wbGa-ZwHQ-ZWcX-t5Tm-vQIVUu

How can I Allocate now the Free PE /Size ? The filesystem available 
space is still 135 GB...
Thanks
Max (Italy)

Re: [linux-lvm] How can I expand a physical volume ?

[Luca Berra]

On Wed, Jan 04, 2006 at 11:35:44AM +0100, Massimiliano wrote:
>Luca Berra ha scritto:
>
>>On Thu, Dec 29, 2005 at 09:12:53AM +0100, Massimiliano wrote:
>>
>>>Hi !
>>
>>
>>two ways, either create a new partition with the free space,
>>pvcreate it and vgextend your volume group
>>or
>>edit your partition table and make the 2nd partition bigger.
>>(you might need to reboot here)
>>then
>
>Did what you suggested (following the first solution) . Now vgdisplay 
....
>How can I Allocate now the Free PE /Size ? The filesystem available 
>space is still 135 GB...

lvextend to increas the size of the logical volume,

then, the tool to resize whatever filesystem you have on that
resize2fs/ext2resize/ext2online (EXT2/EXT3)
resize_reiserfs/mount -o remount,resize (REISER)
xfs_growfs (XFS)
mount -o remount,resize (JFS)
.....


-- 
Luca Berra -- bluca@comedia.it
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