Foreword
lvm (Logical Volume Manager) Logical volume management can meet the needs of the Linux system to dynamically adjust the size of each partition to meet the needs of the server in different operating periods.
In the past, playing LVM under Linux usually chose ext3 and ext4 file systems. Recently, a MySQL database server was installed and configured under Ubuntu 16.04.5. Then I tested the LVM of the XFS file system. In contrast, the difference is not big, just the difference in file formatting and the adjustment commands of the file system. Many places below do not explain too much, but simply record the test process.
Add a new disk to the test server, as shown below, the new disk is /dec/sdc
root@mylnx12:~# fdisk -l
Disk /dev/sdb:605 GiB,649613803520 bytes,1268776960 sectors
Units: sectors of1*512=512 bytes
Sector size(logical/physical):512 bytes /512 bytes
I/O size(minimum/optimal):512 bytes /512 bytes
Disklabel type: dos
Disk identifier:0x2c2c38b3
Device Boot Start End Sectors Size Id Type
/dev/sdb1 204812687749111268772864 605G 7 HPFS/NTFS/exFAT
Disk /dev/sda:30 GiB,32212254720 bytes,62914560 sectors
Units: sectors of1*512=512 bytes
Sector size(logical/physical):512 bytes /512 bytes
I/O size(minimum/optimal):512 bytes /512 bytes
Disklabel type: dos
Disk identifier:0x6e2369f9
Device Boot Start End Sectors Size Id Type
/dev/sda1 *20486291452662912479 30G 83 Linux
Disk /dev/sdc:1023 GiB,1098437885952 bytes,2145386496 sectors
Units: sectors of1*512=512 bytes
Sector size(logical/physical):512 bytes /512 bytes
I/O size(minimum/optimal):512 bytes /512 bytes
Disklabel type: dos
Disk identifier:0x030b81c8
Device Boot Start End Sectors Size Id Type
/dev/sdc1 204821453864952145384448 1023G 83 Linux
# Create PV
root@mylnx12:~# pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created
root@mylnx12:~# pvscan
PV /dev/sdc1 lvm2 [1023.00 GiB]
Total:1[1023.00 GiB]/in use:0[0]/in no VG:1[1023.00 GiB]
# Create VG
root@mylnx12:~# vgcreate -s 32M VolGroup01 /dev/sdc1
Volume group "VolGroup01" successfully created
# Add LV
root@mylnx12:~# lvcreate -L +400G -n LogVol00 VolGroup01
WARNING: xfs signature detected on /dev/VolGroup01/LogVol00 at offset 0. Wipe it?[y/n]: y
Wiping xfs signature on /dev/VolGroup01/LogVol00.
Logical volume "LogVol00" created.
root@mylnx12:~# lvscan
ACTIVE '/dev/VolGroup01/LogVol00'[400.00 GiB] inherit
# format
root@mylnx12:~# mkfs.xfs /dev/VolGroup01/LogVol00
meta-data=/dev/VolGroup01/LogVol00 isize=512 agcount=4, agsize=26214400 blks
= sectsz=512 attr=2, projid32bit=1= crc=1 finobt=1, sparse=0
data = bsize=4096 blocks=104857600, imaxpct=25= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=51200, version=2= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
# Mount point settings
root@mylnx12:~# mkdir /mysql_data
root@mylnx12:~# mount -t xfs /dev/VolGroup01/LogVol00 /mysql_data
root@mylnx12:~# vgdisplay
- - - Volume group ---
VG Name VolGroup01
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 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 1022.97 GiB
PE Size 32.00 MiB
Total PE 32735
Alloc PE / Size 12800/400.00 GiB
Free PE / Size 19935/622.97 GiB
VG UUID 8kutIc-bjId-rNWK-UCHo-TU2l-xkwa-idBXCj
# Create another LV
root@mylnx12:~# lvcreate -l 19935-n LogVol01 VolGroup01
Logical volume "LogVol01" created.
root@mylnx12:~# mkfs.xfs /dev/VolGroup01/LogVol01
meta-data=/dev/VolGroup01/LogVol01 isize=512 agcount=4, agsize=40826880 blks
= sectsz=512 attr=2, projid32bit=1= crc=1 finobt=1, sparse=0
data = bsize=4096 blocks=163307520, imaxpct=25= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=79740, version=2= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
root@mylnx12:~# mkdir /mysql_backup
root@mylnx12:~# mount -t xfs /dev/VolGroup01/LogVol01 /mysql_backup/
root@mylnx12:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 6.9G 06.9G 0%/dev
tmpfs 1.4G 8.6M 1.4G 1%/run
/dev/sda1 30G 2.1G 27G 8% /
tmpfs 6.9G 06.9G 0%/dev/shm
tmpfs 5.0M 05.0M 0%/run/lock
tmpfs 6.9G 06.9G 0%/sys/fs/cgroup
/dev/sdb1 596G 70M 566G 1%/mnt
tmpfs 1.4G 01.4G 0%/run/user/1000/dev/mapper/VolGroup01-LogVol00 400G 441M 400G 1%/mysql_data
/dev/mapper/VolGroup01-LogVol01 623G 668M 623G 1%/mysql_backup
Modify the configuration file /etc/fstab, and add the following configuration information to it, as shown below, for permanent preservation, to ensure that the relevant mount point information will not be lost the next time you boot.
UUID="a72bd3f8-eb2d-40cb-92c3-d5e32c30d5ff"/mysql_data xfs defaults 02
UUID="33325d87-f3f4-4215-abf7-ee795724697e"/mysql_backup xfs defaults 02
In addition, the adjustment command for the ext2/ext3/ext4 file system is resize2fs (both increase and decrease are supported), and the adjustment command for the XFS file system is xfs_growfs (only increase). Of course, if you have to reduce it, you can only reduce it. After the young, re-format the logical partition through the mkfs.xfs command to mount it. In this case, the original data on the logical partition will be lost. It doesn't make much sense.
Reference material:
https://www.zalou.cn/article/148553.htm
to sum up
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