管理LVM逻辑卷

1．为主机增加80G SCSI 接口硬盘

2．划分三个各20G的主分区

 fdisk -l

3．将三个主分区转换为物理卷（pvcreate），扫描系统中的物理卷

[root@localhost ~]# pvcreate /dev/sdc[123]

  Physical volume "/dev/sdc1" successfully created

  Physical volume "/dev/sdc2" successfully created

  Physical volume "/dev/sdc3" successfully created

[root@localhost ~]# pvs

  PV         VG     Fmt  Attr PSize  PFree

  /dev/sda2  centos lvm2 a--  29.51g 44.00m

  /dev/sdc1         lvm2 ---  20.00g 20.00g

  /dev/sdc2         lvm2 ---  20.00g 20.00g

  /dev/sdc3         lvm2 ---  20.00g 20.00g

4．使用两个物理卷创建卷组，名字为myvg，查看卷组大小

[root@localhost ~]# vgcreate myvg /dev/sdc[12]

  Volume group "myvg" successfully created

[root@localhost ~]# vgdisplay

 --- Volume group ---

  VG Name               myvg

  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               MNSzCi-MF8R-hoti-tvEs-YP3B-noz0-ZUADtS

5．创建逻辑卷mylv，大小为30G

[root@localhost ~]# lvcreate -L 30 -n mylv myvg

  Rounding up size to full physical extent 32.00 MiB

  Logical volume "mylv" created.

6．将逻辑卷格式化成xfs文件系统，并挂载到/data目录上，创建文件测试

[root@localhost ~]# mkfs -t xfs /dev/myvg/mylv

meta-data=/dev/myvg/mylv         isize=256    agcount=2, agsize=4096 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=0        finobt=0

data     =                       bsize=4096   blocks=8192, imaxpct=25

         =                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=0

log      =internal log           bsize=4096   blocks=853, version=2

         =                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

[root@localhost ~]# mount /dev/myvg/mylv /data

[root@localhost ~]# touch /data/lty.txt

[root@localhost ~]# ls /data

lty.txt

7．增大逻辑卷到35G

[root@localhost ~]# lvextend -L +5G /dev/myvg/mylv

  Size of logical volume myvg/mylv changed from 32.00 MiB (8 extents) to 5.03 GiB (1288 extents).

  Logical volume mylv successfully resized

[root@localhost ~]# xfs_growfs /dev/myvg/mylv

meta-data=/dev/mapper/myvg-mylv  isize=256    agcount=2, agsize=4096 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=0        finobt=0

data     =                       bsize=4096   blocks=8192, imaxpct=25

         =                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=0

log      =internal               bsize=4096   blocks=853, version=2

         =                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

data blocks changed from 8192 to 1318912

8．编辑/etc/fstab文件挂载逻辑卷，并支持磁盘配额选项

9．创建磁盘配额，crushlinux用户在/data目录下文件大小软限制为80M，硬限制为100M，

crushlinux用户在/data目录下文件数量软限制为80个，硬限制为100个。

10．使用touch dd 命令在/data目录下测试

11．查看配额的使用情况：用户角度

12．查看配额的使用情况：文件系统角度