Centos7使用SSM管理LVM卷

系统存储管理器(SSM)提供了一个命令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

Centos7.7 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 ~]#

https://www.csdn.net/article/a/2020-05-15/15991308

https://article.pchome.net/content-2111667.html

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命令可以调整卷的大小。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。