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I'm trying to extend a LVM in a Vmware Workstation 12 Pro CentOS VM. Below are the steps I am following and where I stopped because don't know how to folow from there:

  1. Create the primary partition using fdisk command

  2. Get partition table info using fdisk -l:

    # fdisk -l

Disk /dev/sda: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0001d929

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        5222    41430016   8e  Linux LVM
/dev/sda3            5222       10443    41940357+  8e  Linux LVM

Disk /dev/mapper/vg_webserver-lv_root: 38.3 GB, 38277218304 bytes
255 heads, 63 sectors/track, 4653 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/vg_webserver-lv_swap: 4143 MB, 4143972352 bytes
255 heads, 63 sectors/track, 503 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

  3. Convert the partition to physical volume:

    # pvcreate /dev/sda3
  Physical volume "/dev/sda3" successfully created

  4. Get the name of the volume to extend:

    # vgdisplay
  --- Volume group ---
  VG Name               vg_webserver
  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               39.51 GiB
  PE Size               4.00 MiB
  Total PE              10114
  Alloc PE / Size       10114 / 39.51 GiB
  Free  PE / Size       0 / 0
  VG UUID               qo4qm0-yTZc-TVzt-Ys0t-Ap2j-sH4X-rtMqPS

  5. Extend the physical volume:

    # vgextend vg_webserver /dev/sda3
  Volume group "vg_webserver" successfully extended

  6. Get the "free" space available:

    # vgextend vg_webserver /dev/sda3
  Volume group "vg_webserver" successfully extended

  7. Get the info for logical volume:

    # lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_webserver/lv_root
  LV Name                lv_root
  VG Name                vg_webserver
  LV UUID                ayl9Ae-Y7nk-CVXG-c0G1-P4vx-wdlD-hEmXSO
  LV Write Access        read/write
  LV Creation host, time webserver.localhost, 2015-10-27 12:48:48 -0400
  LV Status              available
  # open                 1
  LV Size                35.65 GiB
  Current LE             9126
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/vg_webserver/lv_swap
  LV Name                lv_swap
  VG Name                vg_webserver
  LV UUID                vwXfta-tGr0-kQFI-B2vF-L4gT-skE5-yb5qXA
  LV Write Access        read/write
  LV Creation host, time webserver.localhost, 2015-10-27 12:48:52 -0400
  LV Status              available
  # open                 1
  LV Size                3.86 GiB
  Current LE             988
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  8. Extend the logical volume:

    # lvextend -L+40G /dev/vg_webserver/lv_root
  Insufficient free space: 10240 extents needed, but only 10239 available

I got the error above and I don't know where to go from there and how to fix this, can any help me? What I am doing wrong and what is the logical explanation behind the issue I am running?

Note: I have read this but I am not sure how to undone every change I've already made and if this info is the path to follow

UPDATE

As requested here is the ouptut of the following commands:

# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_webserver
  PV Size               39.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              10114
  Free PE               0
  Allocated PE          10114
  PV UUID               mwFIHY-mwwJ-b3uk-PkbP-7JXp-Vp2t-foCZtt

  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               vg_webserver
  PV Size               40.00 GiB / not usable 1.38 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              10239
  Free PE               0
  Allocated PE          10239
  PV UUID               tWg4Oj-ZknB-mefb-Ggy9-V8Cu-C7S2-OvO5aU

# vgdisplay
  --- Volume group ---
  VG Name               vg_webserver
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  5
  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               79.50 GiB
  PE Size               4.00 MiB
  Total PE              20353
  Alloc PE / Size       20353 / 79.50 GiB
  Free  PE / Size       0 / 0
  VG UUID               qo4qm0-yTZc-TVzt-Ys0t-Ap2j-sH4X-rtMqPS

# lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_webserver/lv_root
  LV Name                lv_root
  VG Name                vg_webserver
  LV UUID                ayl9Ae-Y7nk-CVXG-c0G1-P4vx-wdlD-hEmXSO
  LV Write Access        read/write
  LV Creation host, time webserver.localhost, 2015-10-27 12:48:48 -0400
  LV Status              available
  # open                 1
  LV Size                75.64 GiB
  Current LE             19365
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/vg_webserver/lv_swap
  LV Name                lv_swap
  VG Name                vg_webserver
  LV UUID                vwXfta-tGr0-kQFI-B2vF-L4gT-skE5-yb5qXA
  LV Write Access        read/write
  LV Creation host, time webserver.localhost, 2015-10-27 12:48:52 -0400
  LV Status              available
  # open                 1
  LV Size                3.86 GiB
  Current LE             988
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
ReynierPM
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4 Answers4

17

I think thare is some roundings at work that cause your lvextend to fail.

Try this: lvextend /dev/vg_webserver/lv_root -l+100%FREE

The above command will ask the system to allocate all free space to the selected logical volume, without asking for a specific size.

shodanshok
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  • The command works and this is the output `# lvextend /dev/vg_webserver/lv_root -l+100%FREE Size of logical volume vg_webserver/lv_root changed from 35.65 GiB (9126 extents) to 75.64 GiB (19365 extents). Logical volume lv_root successfully resized` but where did the ~5GB goes? – ReynierPM Nov 02 '15 at 21:40
  • Can you post the output of pvdisplay, vgdisplay and lvdisplay – shodanshok Nov 02 '15 at 21:44
  • Done, in the main post – ReynierPM Nov 02 '15 at 21:46
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    It's all ok: lv_root was 35 GB, and after the added 40 GB it's at 75 GB. The other space is assigned to lv_swap (4 GB) and some is "lost" in rounding and decimal/binary conversion. – shodanshok Nov 02 '15 at 22:26
2

You can run grab all free spaces: lvextend /dev/vg_webserver/lv_root -l+100%FREE

Following that you need to run: In case of xfs: xfs_growfs <partition> For ext4: resize2fs <partition>

Debashis Prusty
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0

You can use -l option with number of available extents:

sudo lvextend  -l+10239 /dev/vg_webserver/lv_root

citation from man lvextend:

   -l|--extents [+]Number[PERCENT]

Specifies the new size of the LV in logical extents.
The --size and --extents options are alternate methods of specifying size. The total number of physical extents used will be greater when redundant data is needed for RAID levels. An alternate syntax allows the size to be determined indirectly as a percentage of the size of a related VG, LV, or set of PVs. The suffix %VG denotes the total size of the VG, the suffix %FREE the remaining free space in the VG, and the suffix %PVS the free space in the specified PVs. For a snapshot, the size can be expressed as a percentage of the total size of the origin LV with the suffix %ORIGIN (100%ORIGIN provides space for the whole origin). When expressed as a percentage, the size defines an upper limit for the number of logical extents in the new LV. The precise number of logical extents in the new LV is not determined until the command has completed. When the plus + or minus - prefix is used, the value is not an absolute size, but is relative and added or subtracted from the current size.

junior ruby developer
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0

Better way to do this is:

#vgdisplay

  --- Volume group ---
  VG Name               vg2
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <2.00 GiB
  PE Size               4.00 MiB
  Total PE              511
  Alloc PE / Size       256 / 1.00 GiB
  Free  PE / Size       255 / 1020.00 MiB
  VG UUID               aY23Dw-zS2G-Ng0k-KwBr-G3mD-uQhk-VxNIpi

Look for "Free PE / Size". In this case 1020M. So do:

#lvresize -L +1020M "device"
Michael Hampton
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Vamshi
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