Extend LVM after adding new disk to the server Linux

Extend LVM after adding new disk to the server Linux

This document describes the procedure to extend your existing mount point after adding the disk in RHEL 7 using LVM.

1.Please create partition on newly added disk

[root@linuxacademy1 ~]# gdisk /dev/xvdf
GPT fdisk (gdisk) version 0.8.6

Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present

Creating new GPT entries.

Command (? for help): n
Partition number (1-128, default 1):
First sector (34-41943006, default = 2048) or {+-}size{KMGTP}:
Last sector (2048-41943006, default = 41943006) or {+-}size{KMGTP}:
Current type is ‘Linux filesystem’
Hex code or GUID (L to show codes, Enter = 8300): 008a
Exact type match not found for type code 008A; assigning type code for
‘Linux filesystem’
Changed type of partition to ‘Linux filesystem’

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/xvdf.
The operation has completed successfully.
[root@linuxacademy1 ~]# gdisk /dev/xvdg
GPT fdisk (gdisk) version 0.8.6

Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present

Creating new GPT entries.

Command (? for help): n
Partition number (1-128, default 1): 1
First sector (34-41943006, default = 2048) or {+-}size{KMGTP}:
Last sector (2048-41943006, default = 41943006) or {+-}size{KMGTP}:
Current type is ‘Linux filesystem’
Hex code or GUID (L to show codes, Enter = 8300): 008a
Exact type match not found for type code 008A; assigning type code for
‘Linux filesystem’
Changed type of partition to ‘Linux filesystem’

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/xvdg.
The operation has completed successfully.

2.Now please create physical volume group

[root@linuxacademy1 ~]# pvcreate /dev/xvdf1 /dev/xvdg1
Physical volume “/dev/xvdf1” successfully created.
Physical volume “/dev/xvdg1” successfully created.
[root@linuxacademy1 ~]# pvdisplay

“/dev/xvdf1” is a new physical volume of “<20.00 GiB”
— NEW Physical volume —
PV Name /dev/xvdf1
VG Name
PV Size <20.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID a52OwU-svuG-mR1O-wJ2E-pZ2i-HCFa-287P7I

“/dev/xvdg1” is a new physical volume of “<20.00 GiB”
— NEW Physical volume —
PV Name /dev/xvdg1
VG Name
PV Size <20.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID cVCWqw-BSdi-FC00-e5JW-2dq9-QQH2-13q7eZ

[root@linuxacademy1 ~]# vgcreate battlestar /dev/xvdf1 /dev/xvdg1
Volume group “battlestar” successfully created
[root@linuxacademy1 ~]# vgdisplay
— Volume group —
VG Name battlestar
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 39.99 GiB
PE Size 4.00 MiB
Total PE 10238
Alloc PE / Size 0 / 0
Free PE / Size 10238 / 39.99 GiB
VG UUID xtAtA6-4WZY-KZK8-wskY-QNcJ-YYKt-3XlSh1

3.Please create logical volume now

[root@linuxacademy1 ~]# lvcreate -n galactica -L 20G battlestar
Logical volume “galactica” created.
[root@linuxacademy1 ~]# mkfs -t xfs /dev/battlestar/galactica
meta-data=/dev/battlestar/galactica isize=512 agcount=4, agsize=1310720 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=5242880, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0

4.Mount now.

[root@linuxacademy1 ~]# mkdir /mnt/mydir
[root@linuxacademy1 ~]# mount /dev/battlestar/galactica /mnt/mydir

5.Please add the extra disk to expand mount point

You can use following command to scan newly added disk online(No need to restart server)

echo “- – -” > /sys/class/scsi_host/host0/scan
 echo “- – -” > /sys/class/scsi_host/host1/scan

[root@linuxacademy1 ~]# gdisk /dev/xvdj
GPT fdisk (gdisk) version 0.8.6

Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present

Creating new GPT entries.

Command (? for help): n
Partition number (1-128, default 1):
First sector (34-41943006, default = 2048) or {+-}size{KMGTP}:
Last sector (2048-41943006, default = 41943006) or {+-}size{KMGTP}:
Current type is ‘Linux filesystem’
Hex code or GUID (L to show codes, Enter = 8300): 008a
Exact type match not found for type code 008A; assigning type code for
‘Linux filesystem’
Changed type of partition to ‘Linux filesystem’

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/xvdj.
The operation has completed successfully.

[root@linuxacademy1 ~]# partprobe

6.Extending volume group now

[root@linuxacademy1 ~]# pvcreate /dev/xvdj1
Physical volume “/dev/xvdj1” successfully created.
[root@linuxacademy1 ~]# vgextend battlestar /dev/xvdj1
Volume group “battlestar” successfully extended
[root@linuxacademy1 ~]# vgdisplay
— Volume group —
VG Name battlestar
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 3
Act PV 3
VG Size <59.99 GiB
PE Size 4.00 MiB
Total PE 15357
Alloc PE / Size 5120 / 20.00 GiB
Free PE / Size 10237 / <39.99 GiB
VG UUID xtAtA6-4WZY-KZK8-wskY-QNcJ-YYKt-3XlSh1

[root@linuxacademy1 ~]# lvextend -L 59G /dev/battlestar/galactica
Size of logical volume battlestar/galactica changed from 20.00 GiB (5120 extents) to 59.00 GiB (15104 extents).
Logical volume battlestar/galactica successfully resized.
[root@linuxacademy1 ~]# lvdisplay
— Logical volume —
LV Path /dev/battlestar/galactica
LV Name galactica
VG Name battlestar
LV UUID 0C8PRN-HsxV-mnne-9Awb-Net4-zNAN-kpJrM9
LV Write Access read/write
LV Creation host, time linuxacademy1, 2017-10-16 05:06:56 -0400
LV Status available
# open 1
LV Size 59.00 GiB
Current LE 15104
Segments 3
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:0

7.Please check disk space now and this has not reflected new size

[root@linuxacademy1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda2 10G 1.9G 8.2G 19% /
devtmpfs 477M 0 477M 0% /dev
tmpfs 496M 0 496M 0% /dev/shm
tmpfs 496M 13M 483M 3% /run
tmpfs 496M 0 496M 0% /sys/fs/cgroup
tmpfs 100M 0 100M 0% /run/user/1001
tmpfs 100M 0 100M 0% /run/user/0
/dev/mapper/battlestar-galactica 20G 33M 20G 1% /mnt/mydir

 

8.Please use following command to resize mount point

For XFS file system

[root@linuxacademy1 ~]# xfs_growfs /mnt/mydir
meta-data=/dev/mapper/battlestar-galactica isize=512 agcount=4, agsize=1310720 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=5242880, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 5242880 to 15466496

For Ext4 file system

[root@linuxacademy1 ~]# resize2fs /dev/mapper/battlestar-galactica
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/mapper/oemcc-oemcc is mounted on /oemcc; on-line resizing required
old_desc_blocks = 4, new_desc_blocks = 7
The filesystem on /dev/mapper/oemcc-oemcc is now 14680064 blocks long.

[root@linuxacademy1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda2 10G 1.9G 8.2G 19% /
devtmpfs 477M 0 477M 0% /dev
tmpfs 496M 0 496M 0% /dev/shm
tmpfs 496M 13M 483M 3% /run
tmpfs 496M 0 496M 0% /sys/fs/cgroup
tmpfs 100M 0 100M 0% /run/user/1001
tmpfs 100M 0 100M 0% /run/user/0
/dev/mapper/battlestar-galactica 59G 33M 59G 1% /mnt/mydir