RAID,LVM牛逼功能及用法
一、高级文件系统管理
十余年专业网站建设公司历程，坚持以创新为先导的网站服务，服务超过上千家企业及个人，涉及网站设计、成都app软件开发、微信开发、平面设计、互联网整合营销等多个领域。在不同行业和领域给人们的工作和生活带来美好变化。
1） 设定文件系统配额
2） 设定和管理软RAID设备
3） 配置逻辑卷
4） 设定LVM快照
5） btrfs文件系统
二、配置磁盘配额
演示步骤如下：
1、分区挂载将/home目录下的所有文件拷贝至/dev/sdc1
fdsik /dev/sdc
mount /dec/sdc1 /mnt/test
mv /home/* /mnt/test
mount /dev/sdc1 /home
2、启动配额挂载选项
/dev/sdc1 /mnt/test ext4 defaults 0 0
/dev/sdc1 /home ext4 usrquota,grpquota 0 0
3、启动数据库,如遇到报错则关闭防火墙及重新挂载(mount -0 remount usrquota,grpquota)
setenforce 0 #临时关闭selinux
getenforce #查看selinux状态
quotacheck -cug /home #创建磁盘配额数据库
4、启动数据库
quotaon -p /home #查看是否已启动数据库
quotaon /home #启动数据库
repquota /home #报告各个家目录下用户的默认磁盘配额
5、配置配额项
edquota alren #给alren用户配置配额
setquota alren 100000 150000 0 0 /home
6、测试
dd if=/dev/zero of=/home/alren/testfile bs=1M count=100
dd if=/dev/zero of=/home/alren/testfiel bs=1M count=160
代码演示：
[root@centos6 ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Thu Aug 11 03:07:57 2016 # # 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 # tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 /dev/sdb1 swap swap pri=10 0 0 /swapfile swap swap defaults,pri=100 0 0 /dev/sdc1 /mnt/test ext4 defaults 0 0 /dev/sdc1 /home ext4 usrquota,grpquota 0 0 UUID="39208cf4-4d84-430b-ab53-7a26ad9d786d" /mnt/lv0 ext4 defaults 0 0 UUID=240533cf-b37f-4460-974f-702bab867da5 / ext4 defaults1 1 UUID=4e245c68-a392-4ce9-9a99-5d32d8d43872 /boot ext4 defaults1 2 UUID=86aa7b74-24df-4043-ba83-f3b41a99ce0e /testdir ext4 defaults1 2 [root@centos6 home]# mount -o remount,usrquota,grpquota /home [root@centos6 home]# quotacheck -cug /home [root@centos6 home]# ls alren aquota.group aquota.user chen cheng chenggg lost+found [root@centos6 home]# quotaon -p /home group quota on /home (/dev/sdc1) is off user quota on /home (/dev/sdc1) is off [root@centos6 home]# quotaon /home [root@centos6 home]# quotaon -p /home group quota on /home (/dev/sdc1) is on user quota on /home (/dev/sdc1) is on [root@centos6 home]# setquota alren 100000 150000 0 0 /home [root@centos6 ~]# repquota /home *** Report for user quotas on device /dev/sdc1 Block grace time: 7days; Inode grace time: 7days Block limits File limits User used soft hard grace used soft hard grace ---------------------------------------------------------------------- root -- 37952 0 0 967 0 0 chen -- 43644 0 0 3198 0 0 chenggg -- 32 0 0 8 0 0 cheng -- 32 0 0 8 0 0 alren -- 32 100000 150000 9 0 0 [root@centos6 ~]# [root@centos6 home]# edquota alren [root@centos6 home]# su - alren [alren@centos6 ~]$ quota alren Disk quotas for user alren (uid 524): Filesystem blocks quota limit grace files quota limit grace /dev/sdc1 32 100000 150000 8 0 0 [alren@centos6 ~]$ repquota /home repquota: Cannot open quotafile /home/aquota.user: 权限不够 repquota: Quota file not found or has wrong format. repquota: Not all specified mountpoints are using quota. [alren@centos6 ~]$ dd if=/dev/zero of=/home/alren bs=1M count=100 dd: 正在打开"/home/alren": 是一个目录 [alren@centos6 ~]$ dd if=/dev/zero of=/home/alren/testfile bs=1M count=100 sdc1: warning, user block quota exceeded. 记录了100+0 的读入 记录了100+0 的写出 104857600字节(105 MB)已复制，0.613277 秒，171 MB/秒 [alren@centos6 ~]$ dd if=/dev/zero of=/home/alren/testfile bs=1M count=160 sdc1: warning, user block quota exceeded. sdc1: write failed, user block limit reached. dd: 正在写入"/home/alren/testfile": 超出磁盘限额 记录了147+0 的读入 记录了146+0 的写出 153567232字节(154 MB)已复制，0.876813 秒，175 MB/秒 [alren@centos6 ~]$
三、独立冗余磁盘整列(RAID，本文所述为软RAID)
1、简介
RAID:Redundant Arrays of Inexpensive(Independent)Disks，1988年由加利福尼亚大学伯克利分校（University of California-Berkeley） “A Case for Redundant Arrays of Inexpensive Disks”提出。多个磁盘合成一个“阵列”来提供更好的性能、冗余，或者两者都提供，就叫做独立磁盘冗余整列。
2、特点
1）提高IO性能，提升磁盘读写
2）提高耐用性，磁盘冗余来实现
3）多块磁盘组织在一起的工作方式有所不同
3、raid级别
RAID-0：将数据切割成等分，然后按次序存储在磁盘中
RAID-1：将数据切割成等分，然后分别存入各个磁盘中
RAID-5：将数据切割成等分，然后按次序存储在磁盘中，并且每个磁盘轮流存储校验信息
......
RAID-6: 将数据切割成等分，然后按次序存储在磁盘中，并且每个磁盘轮流存储校验信息，且存两份校验信息
RAID-10: 先做raid1，然后做raid0即可
RAID-01: 先做raid0，然后做raid1即可
3、raid级别及其特性
RAID-0；读写性能提升
可用空间n*min(s1,s2...)
无容错能力
最少磁盘数量：2个
RAID-1：读性能提升，写性能有所下降
1*min(s1,s2,...)
有冗余能力
最少磁盘数量：2,2N
RAID-5: 读写性能提升
可用空间(N-1)*min(s1,s2)
有容错能力，只允许坏一块磁盘
最少磁盘数量：3,3+
RAID-6：读写性能提升
可用空间(N-2)*min(s1,s2,...)
有容错能力允许坏两块磁盘
最少磁盘数量：4,4+
RAID-10：读、写性能提升
可用空间：N*min(S1,S2,...)/2
有容错能力：每组镜像最多只能坏一块
最少磁盘数：4, 4+
RAID-01：读、写性能提升
可用空间：N*min(S1,S2,...)/2
有容错能力：每组镜像最多只能坏一块
最少磁盘数：4, 4+
常用级别：RAID-0, RAID-1, RAID-5, RAID-10, RAID-50
软RAID-5基本选项：
mdadm:为软raid提供管理界面，为空余磁盘添加冗余，RAID设备可为/dev/md0、/dev/md1、/dev/md2、 /dev/md3等等
mdadm命令：
语法格式：mdadm [mode]
模式：
创建：-C
装配：-A
管理：-f,-r,-a
-C:创建模式
-n #:使用#个快设备来创建次RAID
-l #:指明RAID及级别
-a {yes|no}:自动创建目标raid设备的设备文件
-c chunck_size:指明块设备的大小
-x #:指明空闲磁盘个数
-D: 显示raid的详细信息
mdadm -D /dev/md#
管理模式：
-f:标记指定磁盘为损坏
-a:添加磁盘
-r:移除磁盘
观察md的模式：
cat /proc/mdstat
停止md设备：
mdamd -S /dev/md#
软RAID-5实现步骤：
1、创建磁盘分区，本实验使用5块磁盘做实验，其中4块为真实使用，1块为冗余备份
fdisk /dev/sd{b,c,d,e,f}1 #磁盘分区10G并改其文件类型为fd
2、创建raid设备
mdadm -C /dev/md0 -a yes -l 5 -n 4 -x1 /dev/sd{b,c,d,e,f}1
mdamd -D /dev/md0
cat /proc/mdstat
3、格式化创建的md0设备
mkfs.ext4 /dev/md0
4、设置开机自动挂载
vim /etc/fstab
UUID="b92ddd51-c555-4948-b1d5-8563b697a2f1" /mnt/raid ext4 defaults 0 0
5、生成配置文件/etc/mdadm.conf
mdadm -Ds /dev/md0 > /etc/mdadm.conf
mdadm -S /dev/md0 停止raid
mdadm -A /dev/md0 启动raid
6、测试
mdadm /dev/md0 -f /dev/sdf1 #模拟损坏
mdadm /dev/md0 -r /dev/sdf1 #删除成员
mdadm /dev/md0 -a /dev/sdf1 #增加
mdadm -G /dev/md0 -n 6 -a /dev/sdd4 #增加成员
mkfs.ext4 /dev/md0 #重新格式化
7、删除raid
umount /mnt/raid
mdadm -S /dev/md0 停止raid
rm -f /etc/mdadm.conf
vi /etc/fstab
fdisk /dev/sda
mdadm --zero-superblock /dev/sdd1
演示：
[root@centos7 ~]# mdadm -C /dev/md0 -a yes -l 5 -n 4 -x1 /dev/sd{b,c,d,e,f}1
mdadm: /dev/sdb1 appears to contain an ext2fs file system
size=5242880K mtime=Thu Jan 1 08:00:00 1970
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
[root@centos7 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Aug 30 11:28:31 2016
Raid Level : raid5
Array Size : 31432704 (29.98 GiB 32.19 GB)
Used Dev Size : 10477568 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Tue Aug 30 11:28:42 2016
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 5
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 18% complete
Name : centos7.localdomain:0 (local to host centos7.localdomain)
UUID : 40fbcb9e:3de8f63f:0ec52e1d:98020537
Events : 3
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
5 8 65 3 spare rebuilding /dev/sde1
4 8 81 - spare /dev/sdf1
[root@centos7 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Aug 30 11:28:31 2016
Raid Level : raid5
Array Size : 31432704 (29.98 GiB 32.19 GB)
Used Dev Size : 10477568 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Tue Aug 30 11:29:42 2016
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 5
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 88% complete
Name : centos7.localdomain:0 (local to host centos7.localdomain)
UUID : 40fbcb9e:3de8f63f:0ec52e1d:98020537
Events : 15
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
5 8 65 3 spare rebuilding /dev/sde1
4 8 81 - spare /dev/sdf1
[root@centos7 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Aug 30 11:28:31 2016
Raid Level : raid5
Array Size : 31432704 (29.98 GiB 32.19 GB)
Used Dev Size : 10477568 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Tue Aug 30 11:29:52 2016
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Name : centos7.localdomain:0 (local to host centos7.localdomain)
UUID : 40fbcb9e:3de8f63f:0ec52e1d:98020537
Events : 18
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
5 8 65 3 active sync /dev/sde1
4 8 81 - spare /dev/sdf1
[root@centos7 ~]# mkfs.ext4 /dev/md0
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=128 blocks, Stripe width=384 blocks
1966080 inodes, 7858176 blocks
392908 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2155872256
240 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos7 ~]# mdadm -Ds /dev/md0 >/etc/mdadm.conf
[root@centos7 ~]# mdadm -S /dev/md0
mdadm: stopped /dev/md0
[root@centos7 ~]# mdadm -A /dev/md0
mdadm: /dev/md0 has been started with 4 drives and 1 spare.
[root@centos7 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Aug 30 11:28:31 2016
Raid Level : raid5
Array Size : 31432704 (29.98 GiB 32.19 GB)
Used Dev Size : 10477568 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Tue Aug 30 11:30:29 2016
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Name : centos7.localdomain:0 (local to host centos7.localdomain)
UUID : 40fbcb9e:3de8f63f:0ec52e1d:98020537
Events : 18
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
5 8 65 3 active sync /dev/sde1
4 8 81 - spare /dev/sdf1
[root@centos7 ~]# mdadm /dev/md0 -f /dev/sdb1
mdadm: set /dev/sdb1 faulty in /dev/md0
[root@centos7 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Aug 30 11:28:31 2016
Raid Level : raid5
Array Size : 31432704 (29.98 GiB 32.19 GB)
Used Dev Size : 10477568 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Tue Aug 30 11:32:19 2016
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 4
Failed Devices : 1
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 5% complete
Name : centos7.localdomain:0 (local to host centos7.localdomain)
UUID : 40fbcb9e:3de8f63f:0ec52e1d:98020537
Events : 20
Number Major Minor RaidDevice State
4 8 81 0 spare rebuilding /dev/sdf1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
5 8 65 3 active sync /dev/sde1
0 8 17 - faulty /dev/sdb1
[root@centos7 ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdb1[0](F) sdf1[4] sde1[5] sdd1[2] sdc1[1]
31432704 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [_UUU]
[========>............] recovery = 43.8% (4592156/10477568) finish=0.7min speed=129724K/sec
unused devices:
[root@centos7 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Aug 30 11:28:31 2016
Raid Level : raid5
Array Size : 31432704 (29.98 GiB 32.19 GB)
Used Dev Size : 10477568 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Tue Aug 30 11:33:40 2016
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 1
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : centos7.localdomain:0 (local to host centos7.localdomain)
UUID : 40fbcb9e:3de8f63f:0ec52e1d:98020537
Events : 37
Number Major Minor RaidDevice State
4 8 81 0 active sync /dev/sdf1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
5 8 65 3 active sync /dev/sde1
0 8 17 - faulty /dev/sdb1
[root@centos7 ~]# mdadm -G /dev/md0 -n 6 -a /dev/sdb2
mdadm: Need 2 spares to avoid degraded array, and only have 1.
Use --force to over-ride this check.
[root@centos7 ~]# mdadm -G /dev/md0 -n 6 -a /dev/sdb2 --force
mdadm: added /dev/sdb2
mdadm: Failed to initiate reshape!
unfreeze
[root@centos7 ~]# mkfs.ext4 /dev/md0
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=128 blocks, Stripe width=384 blocks
1966080 inodes, 7858176 blocks
392908 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2155872256
240 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos7 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Aug 30 11:28:31 2016
Raid Level : raid5
Array Size : 31432704 (29.98 GiB 32.19 GB)
Used Dev Size : 10477568 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 6
Persistence : Superblock is persistent
Update Time : Tue Aug 30 11:34:55 2016
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 1
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Name : centos7.localdomain:0 (local to host centos7.localdomain)
UUID : 40fbcb9e:3de8f63f:0ec52e1d:98020537
Events : 41
Number Major Minor RaidDevice State
4 8 81 0 active sync /dev/sdf1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
5 8 65 3 active sync /dev/sde1
0 8 17 - faulty /dev/sdb1
6 8 18 - spare /dev/sdb2
[root@centos7 ~]# mdadm /dev/md0 -r /dev/sdb1
mdadm: hot removed /dev/sdb1 from /dev/md0
[root@centos7 ~]# mdadm /dev/md0 -a /dev/sdb1
mdadm: added /dev/sdb1
[root@centos7 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Aug 30 11:28:31 2016
Raid Level : raid5
Array Size : 31432704 (29.98 GiB 32.19 GB)
Used Dev Size : 10477568 (9.99 GiB 10.73 GB)
Raid Devices : 4
Total Devices : 6
Persistence : Superblock is persistent
Update Time : Tue Aug 30 11:35:46 2016
State : clean
Active Devices : 4
Working Devices : 6
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 512K
Name : centos7.localdomain:0 (local to host centos7.localdomain)
UUID : 40fbcb9e:3de8f63f:0ec52e1d:98020537
Events : 43
Number Major Minor RaidDevice State
4 8 81 0 active sync /dev/sdf1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
5 8 65 3 active sync /dev/sde1
6 8 18 - spare /dev/sdb2
7 8 17 - spare /dev/sdb1
[root@centos7 ~]# 三、LVM(逻辑卷管理)
1、简介
LVM: Logical Volume Manager，允许对卷进行方便操作的抽象层，包括重新设定文件系统的大小，允许在多个物理设备间重新组织文件系统。将设备指定为物理卷，用一个或多个物理卷来创建一个卷组，物理卷是用固定大小的物理区域(PE)来定义，在物理卷上创建逻辑卷，然后在逻辑卷上创建文件系统。
2、pv管理工具
1）显示pv信息
pvs:简要pv信息
pvdisplay:详细pv信息
2）创建pv
pvcreate /dev/DEVICE
3、vg管理工具
1）显示卷组
vgs:简要vg信息
vgdisplay:详细vg信息
2)创建逻辑卷
vgcreate [-s #[kKmMgGtTpPeE]] VolumeGroupName PhysicalDevicePath [PhysicalDevicePath...]
3)管理卷组
vgextend VolumeGroupName PhysicalDevicePath [PhysicalDevicePath...] vgreduce VolumeGroupName PhysicalDevicePath [PhysicalDevicePath...]
4)删除卷组
先做vgremove，再做pvremove
4、lv工具
1)显示逻辑卷
lvs:显示逻辑卷简单信息
lvdisplay:显示详细逻辑卷信息
2）删除逻辑卷
lvremove /dev/VG_NAME/LV_NAME
3)重设文件系统大小
fsadm [options] resize device [new_size[BKMGTEP]] resize2fs [-f] [-F] [-M] [-P] [-p] device [new_size]
5)扩展逻辑卷
lvextend -L [+]#[mMgGtT] /dev/VG_NAME/LV_NAME
resize2fs /dev/VG_NAME/LV_NAME
6）缩减逻辑卷
umount /dev/VG_NAME/LV_NAME
e2fsck -f /dev/VG_NAME/LV_NAME
resize2fs /dev/VG_NAME/LV_NAME
[mMgGtT]
lvreduce -L [-]#[mMgGtT] /dev/VG_NAME/LV_NAME
演示：
[root@centos6 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 3.7G 0 rom
sda 8:0 0 120G 0 disk
├─sda1 8:1 0 200M 0 part /boot
├─sda2 8:2 0 80G 0 part /
├─sda3 8:3 0 20G 0 part /testdir
├─sda4 8:4 0 1K 0 part
├─sda5 8:5 0 4G 0 part [SWAP]
└─sda6 8:6 0 2G 0 part
sdb 8:16 0 120G 0 disk
└─sdb1 8:17 0 2G 0 part [SWAP]
sdc 8:32 0 20G 0 disk
├─sdc2 8:34 0 10G 0 part
└─sdc1 8:33 0 2G 0 part /mnt/test
sdd 8:48 0 20G 0 disk
sde 8:64 0 20G 0 disk
sdf 8:80 0 20G 0 disk
[root@centos6 ~]#
[root@centos6 ~]# pvcreate /dev/sd{c2,d}
Physical volume "/dev/sdc2" successfully created
Physical volume "/dev/sdd" successfully created
[root@centos6 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sdc2 lvm2 ---- 10.00g 10.00g
/dev/sdd lvm2 ---- 20.00g 20.00g
[root@centos6 ~]# pvdisplay
"/dev/sdc2" is a new physical volume of "10.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdc2
VG Name
PV Size 10.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID PZRtfc-8dci-dW2V-ayy6-RVHQ-6oMh-q8LhwC
"/dev/sdd" is a new physical volume of "20.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdd
VG Name
PV Size 20.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID X7gN2P-RysJ-Woci-IiIu-IphR-elkT-sAtSID
################创建逻辑卷组##################
[root@centos6 ~]# vgcreate vg0 /dev/sd{c2,d}
Volume group "vg0" successfully created
[root@centos6 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg0 2 0 0 wz--n- 30.00g 30.00g
[root@centos6 ~]# vgdisplay
--- Volume group ---
VG Name vg0
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 30.00 GiB
PE Size 4.00 MiB
Total PE 7679
Alloc PE / Size 0 / 0
Free PE / Size 7679 / 30.00 GiB
VG UUID gbfTZO-aqo8-kdfg-cLkM-xXug-VWRK-hl1qSA
################创建逻辑卷###################
[root@centos6 ~]# lvcreate -n lv0 -L 15G vg0
Logical volume "lv0" created.
[root@centos6 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv0 vg0 -wi-a----- 15.00g
[root@centos6 ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vg0/lv0
LV Name lv0
VG Name vg0
LV UUID XJ1Nco-ZP4s-h93D-YkIy-DcbN-6TEq-4XXJDI
LV Write Access read/write
LV Creation host, time centos6.localdomain, 2016-08-24 21:26:41 +0800
LV Status available
# open 0
LV Size 15.00 GiB
Current LE 3840
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
[root@centos6 ~]# mkfs.ext4 /dev/vg
vg0/ vga_arbiter
[root@centos6 ~]# mkfs.ext4 /dev/vg0/lv0
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
983040 inodes, 3932160 blocks
196608 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=4026531840
120 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208
正在写入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information: 完成
This filesystem will be automatically checked every 36 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@centos6 ~]# vi /etc/fstab
[root@centos6 ~]# blkid /dev/vg
vg0/ vga_arbiter
[root@centos6 ~]# blkid
/dev/sda2: UUID="240533cf-b37f-4460-974f-702bab867da5" TYPE="ext4"
/dev/sda1: UUID="4e245c68-a392-4ce9-9a99-5d32d8d43872" TYPE="ext4"
/dev/sda3: UUID="86aa7b74-24df-4043-ba83-f3b41a99ce0e" TYPE="ext4"
/dev/sda5: UUID="f8ef48ef-b141-48e5-9735-ff9089bd54ba" TYPE="swap"
/dev/sda6: UUID="ca0c47c7-edb0-4685-8b29-44c6a5bf7a11" TYPE="ext4" LABEL="MYHOME"
/dev/sdb1: UUID="443bb126-8dc0-45a3-acfe-9a37629bb511" TYPE="swap"
/dev/sdc2: UUID="PZRtfc-8dci-dW2V-ayy6-RVHQ-6oMh-q8LhwC" TYPE="LVM2_member"
/dev/sdd: UUID="X7gN2P-RysJ-Woci-IiIu-IphR-elkT-sAtSID" TYPE="LVM2_member"
/dev/mapper/vg0-lv0: UUID="bac8210f-143d-4f89-a3fe-b75be6060274" TYPE="ext4"
/dev/sdc1: UUID="7f140c30-7c34-4387-abac-b4687870463c" TYPE="ext4"
[root@centos6 ~]# vi /etc/fstab
[root@centos6 ~]# mount -a
[root@centos6 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 82438832 5772100 72472428 8% /
tmpfs 502068 0 502068 0% /dev/shm
/dev/sda1 194241 39067 144934 22% /boot
/dev/sda3 20511356 45044 19417736 1% /testdir
/dev/sdc1 2005848 84784 1815840 5% /mnt/test
/dev/sdc1 2005848 84784 1815840 5% /home
/dev/mapper/vg0-lv0 15350768 38384 14525952 1% /mnt/lv0
[root@centos6 ~]# cd /mnt/lv0/
[root@centos6 lv0]# ls
lost+found
[root@centos6 lv0]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 79G 5.6G 70G 8% /
tmpfs 491M 0 491M 0% /dev/shm
/dev/sda1 190M 39M 142M 22% /boot
/dev/sda3 20G 44M 19G 1% /testdir
/dev/sdc1 2.0G 83M 1.8G 5% /mnt/test
/dev/sdc1 2.0G 83M 1.8G 5% /home
/dev/mapper/vg0-lv0 15G 38M 14G 1% /mnt/lv0
################扩展逻辑卷#################
[root@centos6 lv0]# lvextend -L +6G /dev/vg0/lv0
Size of logical volume vg0/lv0 changed from 15.00 GiB (3840 extents)
本文标题：RAID,LVM牛逼功能及用法
本文来源：http://pwwzsj.com/article/pdescj.html
