2

I would like to mount /dev/sda2. How am I supposed to do that?

I have tried this, I'm not sure about the result, df still does not show the free space.

mount -v -o ro /dev/sda2 /data
mount: unknown filesystem type 'LVM2_member'

Bellow is the output of fdisk, df, lvmdiskscan, lvdisplay, vgdisplay, lvscan, pvdisplay.

[root@IctThtSoluti-06 ~]# fdisk -l

Disk /dev/sda: 1030.8 GB, 1030792151040 bytes
255 heads, 63 sectors/track, 125320 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: 0x00034e05

   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        1306     9972736   8e  Linux LVM

Disk /dev/mapper/vg_centos6264bit-lv_root: 8095 MB, 8095006720 bytes
255 heads, 63 sectors/track, 984 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_centos6264bit-lv_swap: 2113 MB, 2113929216 bytes
255 heads, 63 sectors/track, 257 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

[root@IctThtSoluti-06 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_centos6264bit-lv_root
                      7.3G  988M  6.0G  14% /
tmpfs                 3.9G     0  3.9G   0% /dev/shm
/dev/sda1             477M   64M  389M  15% /boot



[root@IctThtSoluti-06 ~]# lvmdiskscan
  /dev/ram0                     [      16.00 MiB]
  /dev/root                     [       7.54 GiB]
  /dev/ram1                     [      16.00 MiB]
  /dev/sda1                     [     500.00 MiB]
  /dev/vg_centos6264bit/lv_swap [       1.97 GiB]
  /dev/ram2                     [      16.00 MiB]
  /dev/sda2                     [       9.51 GiB] LVM physical volume
  /dev/ram3                     [      16.00 MiB]
  /dev/ram4                     [      16.00 MiB]
  /dev/ram5                     [      16.00 MiB]
  /dev/ram6                     [      16.00 MiB]
  /dev/ram7                     [      16.00 MiB]
  /dev/ram8                     [      16.00 MiB]
  /dev/ram9                     [      16.00 MiB]
  /dev/ram10                    [      16.00 MiB]
  /dev/ram11                    [      16.00 MiB]
  /dev/ram12                    [      16.00 MiB]
  /dev/ram13                    [      16.00 MiB]
  /dev/ram14                    [      16.00 MiB]
  /dev/ram15                    [      16.00 MiB]
  2 disks
  17 partitions
  0 LVM physical volume whole disks
  1 LVM physical volume


[root@IctThtSoluti-06 ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_centos6264bit/lv_root
  LV Name                lv_root
  VG Name                vg_centos6264bit
  LV UUID                GuVsuq-Q0II-gcjX-6Pdp-7azY-FPub-25YWYR
  LV Write Access        read/write
  LV Creation host, time ,
  LV Status              available
  # open                 1
  LV Size                7.54 GiB
  Current LE             1930
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/vg_centos6264bit/lv_swap
  LV Name                lv_swap
  VG Name                vg_centos6264bit
  LV UUID                Ukf2if-IlyB-95nM-8Gdq-XXI8-PcKT-fddsqR
  LV Write Access        read/write
  LV Creation host, time ,
  LV Status              available
  # open                 1
  LV Size                1.97 GiB
  Current LE             504
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1



[root@IctThtSoluti-06 ~]# vgdisplay
  --- Volume group ---
  VG Name               vg_centos6264bit
  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               9.51 GiB
  PE Size               4.00 MiB
  Total PE              2434
  Alloc PE / Size       2434 / 9.51 GiB
  Free  PE / Size       0 / 0
  VG UUID               gG9yNW-Jq57-pFkY-oydY-5R4h-oHS0-W7QoWO


[root@IctThtSoluti-06 ~]# lvscan
  ACTIVE            '/dev/vg_centos6264bit/lv_root' [7.54 GiB] inherit
  ACTIVE            '/dev/vg_centos6264bit/lv_swap' [1.97 GiB] inherit

[root@IctThtSoluti-06 ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_centos6264bit
  PV Size               9.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              2434
  Free PE               0
  Allocated PE          2434
  PV UUID               8sR1Mg-e4Pa-2FRI-hl1l-N4ns-mKjI-aszG8Y

[root@IctThtSoluti-06 ~]# vgdisplay vg_centos6264bit
  --- Volume group ---
  VG Name               vg_centos6264bit
  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               9.51 GiB
  PE Size               4.00 MiB
  Total PE              2434
  Alloc PE / Size       2434 / 9.51 GiB
  Free  PE / Size       0 / 0
  VG UUID               gG9yNW-Jq57-pFkY-oydY-5R4h-oHS0-W7QoWO

[root@IctThtSoluti-06 ~]# cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Tue Feb  4 21:48:23 2014
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg_centos6264bit-lv_root /                       ext4    defaults        1 1
UUID=795a0581-67ec-4fa0-ab81-79bb7cc111ab /boot                   ext4    defaults        1 2
/dev/mapper/vg_centos6264bit-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
8
  • What does pvdisplay show ?
    – Vinz
    Oct 27 '15 at 11:22
  • it is likely that /dev/sda2 is the volume group vg_centos6264bit. what is the result of vgdisplay vg_centos6264bit ?
    – Archemar
    Oct 27 '15 at 11:26
  • @Vinz, added pvdisplay output
    – bpgergo
    Oct 27 '15 at 11:28
  • @Archemar, added vgdisplay vg_centos6264bit output
    – bpgergo
    Oct 27 '15 at 11:29
  • 2
    you need to use fdisk to add a third partition /dev/sda3 (you've allocated 1-1306 out of 16065 sector)
    – Archemar
    Oct 27 '15 at 11:44
2

1) create new physical partition /dev/sda3 (and set lvm flag on it ). Do this in parted

mkpart primary 0% 100%
set 3 lvm on
q

2) extend the existing volume group to include the new /dev/sda3 partition

VG_NAME=`vgdisplay  | grep "VG Name"  | awk '{print $3}'`
vgextend $VG_NAME /dev/sda3

3) create logical volume (replace x with size in GigaBytes)

LV_NAME=/dev/vg_centos6264bit/lv_data
lvcreate -L xG -n $LV_NAME $VG_NAME 

4) create file system on the logical volumes

mkfs.ext4 $LV_NAME

5) mount logical volumes

mkdir /data
mount $LV_NAME /data
4
  • thou shall not grep | awk !! use =$(vgdisplay | awk '/VG Name { print $3 ; }' )
    – Archemar
    Oct 28 '15 at 7:23
  • Did you mean to post this answer on a different question? This does something useful (add space to a volume group and create a filesystem on it), but not at all what the question asks. Oct 30 '15 at 23:19
  • @Gilles , yes, this post is supposed to be the answer to the original question. It solves the actual problem I faced on some servers and which is described in the code listing of the original post, and which I would put very simply as, the disk was not usable on the node. Your comment is relevant though, because at the time when I asked the original question, I had no idea what is the real problem, and I guessed I need to 'mount a logical volume'.
    – bpgergo
    Nov 1 '15 at 20:22
  • @Gilles, and yes, this is also an answer to a different question, which I posted on a different SO sub, somewhat rephrased, when I started to understand the problem more deeply.
    – bpgergo
    Nov 1 '15 at 20:22
1

You cannot mount a lvm drive directly.

/dev/sda2 is that partition that contain your root and swap partitions.

lvdisplay show you the LV path where you logical volumes are. This is that path you need to use to mount your volumes

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