运维人

lvm的创建

1. 查看磁盘:

[root@localhost ~]# fdisk -l
......
磁盘 /dev/sdb:21.5 GB, 21474836480 字节,41943040 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节 / 512 字节
I/O 大小(最小/最佳):512 字节 / 512 字节

磁盘 /dev/sdc:21.5 GB, 21474836480 字节,41943040 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节 / 512 字节
I/O 大小(最小/最佳):512 字节 / 512 字节
......

2. 对两块磁盘进行lvm格式分区

fdisk /dev/sdb/ --> n --> p --> 分区号(默认) --> 起始扇区(默认) --> last扇区(默认)
# 修改分区格式
t --> 8e Linux LVM(分区格式为lvm) --> w (保存)

# 退出后对磁盘/dev/sdc 执行相同操作即可

3. 创建物理卷(PV)

[root@localhost ~]# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created
[root@localhost ~]# pvcreate /dev/sdc1
  Physical volume "/dev/sdc1" successfully created
[root@localhost ~]#
# pvdisplay 显示详细PV信息
  "/dev/sdb1" is a new physical volume of "20.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb1
  VG Name
  PV Size               20.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               LcLg0U-gofo-MapY-eilj-OpkQ-TYMO-nSDfh3

  "/dev/sdc1" is a new physical volume of "20.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdc1
  VG Name
  PV Size               20.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               r9Dp6u-S1hL-EmXb-6M7c-yefR-Bzts-B0Rdtd

4. 将PV加入到卷组中(VG)

[root@localhost ~]# vgcreate vg-group /dev/sdb1 /dev/sdc1
  Volume group "vg-group" successfully created

5. 创建一个10G大小的lvm

[root@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize  VFree
  centos     1   2   0 wz--n- 19.51g     0
  vg-group   2   0   0 wz--n- 39.99g 39.99g
[root@localhost ~]# lvcreate -L 10G -n data vg-group
  Logical volume "data" created
[root@localhost ~]# lvs
  LV   VG       Attr       LSize  Pool Origin Data%  Move Log Cpy%Sync Convert
  root centos   -wi-ao---- 17.51g
  swap centos   -wi-ao----  2.00g
  data vg-group -wi-a----- 10.00g

6. 格式化这个lvm成xfs文件系统

[root@localhost ~]# mkfs.xfs /dev/vg-group/data   # 注意这个路径是/dev/卷组名/lvm名
meta-data=/dev/vg-group/data     isize=256    agcount=4, agsize=655360 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0
data     =                       bsize=4096   blocks=2621440, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
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
[root@localhost ~]# lvs
  LV   VG       Attr       LSize  Pool Origin Data%  Move Log Cpy%Sync Convert
  root centos   -wi-ao---- 17.51g
  swap centos   -wi-ao----  2.00g
  data vg-group -wi-a----- 10.00g
[root@localhost ~]#

7. 逻辑卷扩容

使用 lvextend 命令进行逻辑卷扩容。我把所有剩余空间都分配给了data
[root@localhost ~]# lvextend -l +100%FREE /dev/vg-group/data
  Extending logical volume data to 39.99 GiB
  Logical volume data successfully resized
[root@localhost ~]# lvs
  LV   VG       Attr       LSize  Pool Origin Data%  Move Log Cpy%Sync Convert
  root centos   -wi-ao---- 17.51g
  swap centos   -wi-ao----  2.00g
  data vg-group -wi-a----- 39.99g

[root@localhost ~]# mkdir /data
[root@localhost ~]# mount /dev/vg-group/data /data/
[root@localhost ~]# df -hT | grep "data"   # 可以看到这时候的data 只有10G,可是我们的lvm已经有40G
/dev/mapper/vg--group-data xfs        10G   33M   10G    1% /data

8. 使用xfs_growfs命令在线调整xfs格式文件系统大小

[root@localhost ~]# xfs_growfs /dev/vg-group/data
meta-data=/dev/mapper/vg--group-data isize=256    agcount=4, agsize=655360 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0
data     =                       bsize=4096   blocks=2621440, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
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 2621440 to 10483712
[root@localhost ~]# df -hT | grep "data"
/dev/mapper/vg--group-data xfs        40G   33M   40G    1% /data

9 .加入现有的卷组中:

(1)# 查看现有卷组
[root@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize  VFree
  centos     1   2   0 wz--n- 19.51g    0
  vg-group   2   1   0 wz--n- 39.99g    0

(2)#查看新加磁盘,还是先分区,然后更改lvm格式(略)
[root@localhost ~]# fdisk -l | grep sdd
磁盘 /dev/sdd:21.5 GB, 21474836480 字节,41943040 个扇区
/dev/sdd1            2048    41943039    20970496   8e  Linux LVM

(3)#使用 vgextend 命令把/dev/sdd1加入到centos
[root@localhost ~]# vgextend centos /dev/sdd1
  Volume group "centos" successfully extended
[root@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize  VFree
  centos     2   2   0 wz--n- 39.50g 20.00g
  vg-group   2   1   0 wz--n- 39.99g     0
  
(4)使用 lvextend 命令进行逻辑卷root扩容。我把所有剩余空间都分配给了root
[root@localhost ~]# lvextend -l +100%FREE /dev/centos/root
  Extending logical volume root to 37.50 GiB
  Logical volume root successfully resized

[root@localhost ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=256    agcount=4, agsize=1147392 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0
data     =                       bsize=4096   blocks=4589568, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
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 4589568 to 9831424
[root@localhost ~]#
# 此时我们的根分区就得到了扩容啦;
[root@localhost ~]# df -hT | grep "root"
/dev/mapper/centos-root    xfs        38G  929M   37G    3% /

注意:

pvs -- vgs -- lvs 
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评论

  1. 母东 #1

    不错哟

    回复
    2016-07-28
  2. 母东 #2

    🙄 ➡ 👿

    回复
    2016-07-28