Centos7使用SSM管理LVM卷

系统存储管理器(SSM)提供了一个行接口来管理各种技术中的存储。通过使用DM、LVM和MD，存储系统变得越来越复杂。这就造成了一个对用户不友好的系统，使错误和问题更容易出现。SSM通过创建统一的用户界面来缓解这一问题。

环境

• 7.7 Minimal
• system-storage-manager 0.4-9

安装SSM

[root@localhost ~]# yum -y install system-storage-manager

列出设备、卷等信息

使用ssm list 显示所有检测到的设备、池、卷和快照的信息：

[root@localhost ~]# ssm list
-----------------------------------------------------------
Device        Free      Used     Total  Pool    Mount point
-----------------------------------------------------------
/dev/sda                      40.00 GB                     
/dev/sda1                      1.00 GB          /boot      
/dev/sda2  4.00 MB  38.99 GB  39.00 GB  centos             
/dev/sdb                       2.00 GB                     
/dev/sdc                       2.00 GB                     
/dev/sdd                       2.00 GB                     
-----------------------------------------------------------
--------------------------------------------------
Pool    Type  Devices     Free      Used     Total  
--------------------------------------------------
centos  lvm   1        4.00 MB  38.99 GB  39.00 GB  
--------------------------------------------------
--------------------------------------------------------------------------------------
Volume            Pool    Volume size  FS      FS size       Free  Type    Mount point
--------------------------------------------------------------------------------------
/dev/centos/root  centos     36.99 GB  xfs    36.97 GB   34.44 GB  linear  /          
/dev/centos/swap  centos      2.00 GB                              linear             
/dev/sda1                     1.00 GB  xfs  1014.00 MB  864.65 MB          /boot      
--------------------------------------------------------------------------------------
[root@localhost ~]#

可以使用ssm list --help查询帮助信息。

创建新的池、逻辑卷、和文件系统

使用/dev/sdb,/dev/sdc,/dev/sdd三块硬盘创建vg0池，创建lv1逻辑卷，大小为1G，格式化为xfs文件系统格式，挂载到/mnt/volume1目录。

# 创建挂载目录
[root@localhost ~]# mkdir /mnt/volume1
# 创建逻辑卷
[root@localhost ~]# ssm create -s 1G -n lv1 -p vg0 --fstype xfs /dev/sd{b,c,d} /mnt/volume1
  Physical volume "/dev/sdb" successfully created.
  Physical volume "/dev/sdc" successfully created.
  Physical volume "/dev/sdd" successfully created.
  Volume group "vg0" successfully created
  Logical volume "lv1" created.
meta-data=/dev/vg0/lv1           isize=512    agcount=4, agsize=65536 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=262144, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
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
# 查看是否挂载

[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 898M     0  898M   0% /dev
tmpfs                    910M     0  910M   0% /dev/shm
tmpfs                    910M  9.6M  901M   2% /run
tmpfs                    910M     0  910M   0% /sys/fs/cgroup
/dev/mapper/centos-root   37G  2.6G   35G   7% /
/dev/sda1               1014M  150M  865M  15% /boot
tmpfs                    182M     0  182M   0% /run/user/0
/dev/mapper/vg0-lv1     1014M   33M  982M   4% /mnt/volume1

--fstype选项支持的文件类型，目前支持的有：

• ext3
• ext4
• xfs
• btrfs

-s选项指定逻辑卷的大小。

-n选项指定指定逻辑卷的名称

-p选项需要使用哪一个池，如果池不存在，会创建池。

/dev/sd{b,c,d}使用/dev/sdb , /dev/sdc ,/dev/sdd这三个磁盘。

扩展逻辑卷

ssm resize可以调整卷的大小。下面的例子是给lv1逻辑卷增加2G空间，总空间为3G。

[root@localhost ~]# ssm resize -s +2G vg0/lv1
  Size of logical volume vg0/lv1 changed from 1.00 GiB (256 extents) to 3.00 GiB (768 extents).
  Logical volume vg0/lv1 successfully resized.
[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 898M     0  898M   0% /dev
tmpfs                    910M     0  910M   0% /dev/shm
tmpfs                    910M  9.6M  901M   2% /run
tmpfs                    910M     0  910M   0% /sys/fs/cgroup
/dev/mapper/centos-root   37G  2.6G   35G   7% /
/dev/sda1               1014M  150M  865M  15% /boot
tmpfs                    182M     0  182M   0% /run/user/0
/dev/mapper/vg0-lv1      3.0G   33M  3.0G   2% /mnt/volume1

创建快照

为lv1逻辑卷创建快照

[root@localhost ~]# ssm snapshot /dev/vg0/lv1 
  Rounding up size to full physical extent 412.00 MiB
  Logical volume "snap20200325T195111" created.
[root@localhost ~]# ssm list snap
------------------------------------------------------------------------
Snapshot                      Origin  Pool  Volume size     Used  Type  
------------------------------------------------------------------------
/dev/vg0/snap20200325T195111  lv1     vg0     412.00 MB  0.00 KB  linear

删除卷、池

在这里删除卷和池。首先要卸载分区。

[root@localhost ~]# umount /mnt/volume1/
# 删除vg0池和lv1卷
[root@localhost ~]# ssm remove  vg0
Do you really want to remove volume group "vg0" containing 2 logical volumes? [y/n]: y
Do you really want to remove active origin logical volume vg0/lv1 with 1 snapshot(s)? [y/n]: y
  Logical volume "snap20200325T195111" successfully removed
  Logical volume "lv1" successfully removed
  Volume group "vg0" successfully removed

然后从物理卷里面把/dev/sdb,/dev/sdc,/dev/sdd移除掉。

[root@localhost ~]# pvremove /dev/sd{b,c,d}
  Labels on physical volume "/dev/sdb" successfully wiped.
  Labels on physical volume "/dev/sdc" successfully wiped.
  Labels on physical volume "/dev/sdd" successfully wiped.

总结

SSM通过创建统一的用户界面来缓解这一问题。