creating new logical volume on root partition

[qwerty1111]

Hi,

Thank you for the answer and sorry for the late reply, I have been away for Xmas holidays and just back on Sunday.

I will try on the lab to reduce the /home and /swap and see how I can make a new partition from the space retrieved.


Thank you

[qwerty1111]

Hello,

I could reproduce the issue.

I tried many times and got the same error while trying to create a 3GB partition on /dev/sda2.

There are the logs and the screenshots showing the reboot.

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[root@resize2 ~]# lsblk


NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 30G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 29.5G 0 part
├─vggroup-swap 253:0 0 2G 0 lvm [SWAP]
├─vggroup-root 253:1 0 22.7G 0 lvm /
└─vggroup-home 253:2 0 4.9G 0 lvm /home
sr0 11:0 1 6.6G 0 rom /run/media/marc/CentOS 7 x86_64
[root@resize2 ~]#
[root@resize2 ~]# df -Th


Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vggroup-root ext4 23G 3.3G 18G 16% /
devtmpfs devtmpfs 912M 0 912M 0% /dev
tmpfs tmpfs 921M 84K 921M 1% /dev/shm
tmpfs tmpfs 921M 8.7M 912M 1% /run
tmpfs tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 ext4 477M 95M 353M 22% /boot
/dev/mapper/vggroup-home ext4 4.7G 51M 4.4G 2% /home
/dev/sr0 iso9660 6.6G 6.6G 0 100% /run/media/marc/CentOS 7 x86_64
[root@resize2 ~]#
[root@resize2 ~]# pvdisplay


--- Physical volume ---
PV Name /dev/sda2
VG Name vggroup
PV Size 29.50 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 7550
Free PE 0
Allocated PE 7550
PV UUID fbhnuB-wTks-mkMy-9nfX-7ISJ-3MOi-E3IPhV

[root@resize2 ~]#
[root@resize2 ~]# vgdisplay


--- Volume group ---
VG Name vggroup
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 29.49 GiB
PE Size 4.00 MiB
Total PE 7550
Alloc PE / Size 7550 / 29.49 GiB
Free PE / Size 0 / 0
VG UUID ajso7W-2IyX-fE0A-16Jf-buut-O6x4-S4ySY3

[root@resize2 ~]#
[root@resize2 ~]# lvdisplay


--- Logical volume ---
LV Path /dev/vggroup/root
LV Name root
VG Name vggroup
LV UUID eUA7Mk-zekT-LNx4-0GTX-LaKk-0TxC-fCbZ0S
LV Write Access read/write
LV Creation host, time localhost, 2017-12-28 12:33:13 +0000
LV Status available
# open 1
LV Size 22.66 GiB
Current LE 5800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1

--- Logical volume ---
LV Path /dev/vggroup/swap
LV Name swap
VG Name vggroup
LV UUID xoQkXQ-csCo-0MWt-poDC-pwQk-NcWe-fZDwVH
LV Write Access read/write
LV Creation host, time localhost, 2017-12-28 12:33:16 +0000
LV Status available
# open 2
LV Size 1.95 GiB
Current LE 500
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

--- Logical volume ---
LV Path /dev/vggroup/home
LV Name home
VG Name vggroup
LV UUID 7UAzWG-i8CH-ywMV-4MMq-tsiJ-rUeI-Conb3u
LV Write Access read/write
LV Creation host, time localhost, 2017-12-28 12:33:17 +0000
LV Status available
# open 1
LV Size 4.88 GiB
Current LE 1250
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2

[root@resize2 ~]#
[root@resize2 ~]#
[root@resize2 ~]# parted /dev/sda print free


Model: ATA QEMU HARDDISK (scsi)
Disk /dev/sda: 32.2GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
32.3kB 1049kB 1016kB Free Space
1 1049kB 525MB 524MB primary ext4 boot
2 525MB 32.2GB 31.7GB primary lvm
32.2GB 32.2GB 16.8MB Free Space

[root@resize2 ~]#
[root@resize2 ~]#
[root@resize2 ~]# fdisk -l

Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0009cecd

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 62881791 30927872 8e Linux LVM

Disk /dev/mapper/vggroup-swap: 2097 MB, 2097152000 bytes, 4096000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/vggroup-root: 24.3 GB, 24326963200 bytes, 47513600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/vggroup-home: 5242 MB, 5242880000 bytes, 10240000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

[root@resize2 ~]#
[root@resize2 ~]# fdisk /dev/sda2
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xc924a0b7.

Command (m for help): p

Disk /dev/sda2: 31.7 GB, 31670140928 bytes, 61855744 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xc924a0b7

Device Boot Start End Blocks Id System

Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-61855743, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-61855743, default 61855743): +3G
Partition 1 of type Linux and of size 3 GiB is set

Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 22: Invalid argument.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@resize2 ~]#
[root@resize2 ~]# partprobe
Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.
Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.
Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.
[root@resize2 ~]#
[root@resize2 ~]#
[root@resize2 ~]# systemctl reboot




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Is anyone know why I got this error and how to fix it in order to create the partition or logical volume?

Thank you