1、创建raid磁盘阵列，此处我使用raid0。raid创建方法请参考之前的文章。
2、让/dev/md0支持Lvm技术
pvcreate /dev/md0
3、将硬盘加入storage卷组，查看卷组状态。
[root@cat ~]# vgcreate storage /dev/md0 #蓝色字体为卷组名称 Volume group "storage" successfully created [root@cat ~]# vgdisplay #查看卷组状态 --- Volume group --- VG Name storage System ID Format lvm2 Metadata Areas 1 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 1 Act PV 1 VG Size 40.00 GiB PE Size 4.00 MiB Total PE 10239 Alloc PE / Size 0 / 0 Free PE / Size 10239 / 40.00 GiB VG UUID nD9xXT-2h4U-LtM2-Pnij-FWsK-4PlK-i1Gefd --- Volume group --- VG Name rhel 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 19.51 GiB PE Size 4.00 MiB Total PE 4994 Alloc PE / Size 4994 / 19.51 GiB #卷组状态 Free PE / Size 0 / 0 VG UUID 2RrMTz-JyCJ-kt5v-8pak-YoOu-MnRU-bYgxNu
4、切割逻辑卷设备（建议用-l切割；基本单元为4M）-L为容量
[root@cat ~]# lvcreate -n v0 -l 37 storage #4*37M #逻辑卷名称 Logical volume "v0" created [root@cat ~]# lvdisplay --- Logical volume --- LV Path /dev/storage/v0 LV Name v0 VG Name storage LV UUID 0Cqg9l-3I8w-kwdd-Gu3r-R5wp-fAqV-tGY2yS LV Write Access read/write LV Creation host, time cat, 2021-05-19 05:19:51 -0400 LV Status available # open 0 LV Size 148.00 MiB #逻辑卷的大小 Current LE 37 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 4096 Block device 253:2 --- Logical volume --- LV Path /dev/rhel/swap LV Name swap VG Name rhel LV UUID ZING2N-KJL9-aACt-kjNT-dLtV-iqSG-4EfuON LV Write Access read/write LV Creation host, time localhost, 2021-05-07 21:33:24 -0400 LV Status available # open 2 LV Size 2.00 GiB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Logical volume --- LV Path /dev/rhel/root LV Name root VG Name rhel LV UUID T12Xzg-q6Zq-qKCh-O7Hz-7FBH-S29C-hKnmUY LV Write Access read/write LV Creation host, time localhost, 2021-05-07 21:33:24 -0400 LV Status available # open 1 LV Size 17.51 GiB Current LE 4482 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0
5、将逻辑卷格式化，并挂载
[root@cat home]# mkfs.ext4 /dev/storage/v0
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=512 blocks, Stripe width=1024 blocks
38000 inodes, 151552 blocks
7577 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=33816576
19 block groups
8192 blocks per group, 8192 fragments per group
2000 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
[root@cat home]# mkdir haha
[root@cat home]# mount /dev/storage/v0 /home/haha
[root@cat home]# mkfs.ext4 /dev/storage/v0
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=512 blocks, Stripe width=1024 blocks
38000 inodes, 151552 blocks
7577 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=33816576
19 block groups
8192 blocks per group, 8192 fragments per group
2000 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
[root@cat home]# mkdir haha
[root@cat home]# mount /dev/storage/v0 /home/haha
[root@cat home]# echo "/dev/storage/v0 /home/haha ext4 defaults 0 0" >> /etc/fstab
[root@cat home]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Sat May 8 01:33:26 2021
#
# 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/rhel-root / xfs defaults 1 1
UUID=4de5a662-4bfe-41f9-8385-ef09b83c0e54 /boot xfs defaults 1 2
/dev/mapper/rhel-swap swap swap defaults 0 0
/dev/storage/v0 /home/haha ext4 defaults 0 0
以上就将lvm部署介绍完成。
以下扩容逻辑卷：
1、卸载设备（卸载挂载目录）
[root@cat ~]# umount /home/haha
2、扩展逻辑卷（暂时以290M）为例
[root@cat ~]# lvextend -L 290M /dev/storage/v0 #扩展到290M Rounding size to boundary between physical extents: 292.00 MiB Extending logical volume v0 to 292.00 MiB Logical volume v0 successfully resized
3、检查硬盘的完整性，确认目录结构、内容和文件没有丢失。
[root@cat ~]# e2fsck -f /dev/storage/v0 e2fsck 1.42.9 (28-Dec-2013) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/storage/v0: 11/38000 files (0.0% non-contiguous), 10453/151552 blocks
4、重置设备在系统中的容量。（注：对lv逻辑卷进行扩容操作，但系统内核未同步，需手动同步）
[root@cat ~]# resize2fs /dev/storage/v0 resize2fs 1.42.9 (28-Dec-2013) Resizing the filesystem on /dev/storage/v0 to 299008 (1k) blocks. The filesystem on /dev/storage/v0 is now 299008 blocks long.
5、重新挂载
[root@cat ~]# mount -a [root@cat ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel-root 18G 3.1G 15G 18% / devtmpfs 905M 0 905M 0% /dev tmpfs 914M 80K 914M 1% /dev/shm tmpfs 914M 8.9M 905M 1% /run tmpfs 914M 0 914M 0% /sys/fs/cgroup /dev/sda1 497M 119M 379M 24% /boot /dev/mapper/storage-v0 279M 2.1M 259M 1% /home/haha
以上为扩容逻辑卷操作
以下为缩小逻辑卷操作：
1、卸载设备（卸载挂载目录）
[root@cat ~]# umount /home/haha
2、检查文件完整性（注：与扩容步骤不一样）
[root@cat ~]# e2fsck -f /dev/storage/v0 e2fsck 1.42.9 (28-Dec-2013) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/storage/v0: 11/74000 files (0.0% non-contiguous), 15507/299008 blocks
3、通知内核将逻辑卷容量减少120M
[root@cat ~]# resize2fs /dev/storage/v0 120M resize2fs 1.42.9 (28-Dec-2013) Resizing the filesystem on /dev/storage/v0 to 122880 (1k) blocks. The filesystem on /dev/storage/v0 is now 122880 blocks long #要求满足
4、将逻辑卷修改为120M。
[root@cat ~]# lvreduce -L 120M /dev/storage/v0 WARNING: Reducing active logical volume to 120.00 MiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce v0? [y/n]: y Reducing logical volume v0 to 120.00 MiB Logical volume v0 successfully resized
5、重新挂载
[root@cat ~]# mount -a [root@cat ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel-root 18G 3.1G 15G 18% / devtmpfs 905M 0 905M 0% /dev tmpfs 914M 80K 914M 1% /dev/shm tmpfs 914M 8.9M 905M 1% /run tmpfs 914M 0 914M 0% /sys/fs/cgroup /dev/sda1 497M 119M 379M 24% /boot /dev/mapper/storage-v0 113M 1.6M 103M 2% /home/haha #减少到120M
以上为缩小逻辑卷操作
以下为删除逻辑卷
1、取消挂载及删除永久挂载文件（/etc/fstab）的挂载内容
2、删除逻辑卷
[root@cat ~]# lvremove /dev/storage/v0 Do you really want to remove active logical volume v0? [y/n]: y Logical volume "v0" successfully removed
2、删除卷组
[root@cat ~]# vgremove storage Volume group "storage" successfully removed
3、删除物理卷
[root@cat ~]# pvremove /dev/md0 Labels on physical volume "/dev/md0" successfully wiped