系統存儲管理器(SSM)提供了一個命令行接口來管理各種技術中的存儲。通過使用DM、LVM和MD，存儲系統變得越來越複雜。這就造成了一個對用戶不友好的系統，使錯誤和問題更容易出現。SSM通過創建統一的用戶界面來緩解這一問題。
環境
- Centos7.7 Minimal
- system-storage-manager 0.4-9
安裝SSM
<code>[root@localhost ~]# yum -y install system-storage-manager
/<code>
列出設備、卷等信息
使用ssm list 顯示所有檢測到的設備、池、卷和快照的信息：
<code>[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 ~]#
/<code>
可以使用ssm list --help查詢幫助信息。
創建新的池、邏輯卷、和文件系統
使用/dev/sdb,/dev/sdc,/dev/sdd三塊硬盤創建vg0池，創建lv1邏輯卷，大小為1G，格式化為xfs文件系統格式，掛載到/mnt/volume1目錄。
<code># 創建掛載目錄
[root@localhost ~]# mkdir /mnt/volume1
# 創建邏輯卷
[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
# 查看是否掛載
[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
/<code>
--fstype選項支持的文件類型，目前支持的有：
- ext3
- ext4
- xfs
- btrfs
-s選項指定邏輯卷的大小。
-n選項指定指定邏輯卷的名稱
-p選項需要使用哪一個池，如果池不存在，會創建池。
/dev/sd{b,c,d}使用/dev/sdb , /dev/sdc ,/dev/sdd這三個磁盤。
擴展邏輯卷
ssm resize命令可以調整卷的大小。下面的例子是給lv1邏輯卷增加2G空間，總空間為3G。
<code>[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
/<code>
創建快照
為lv1邏輯卷創建快照
<code>[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
/<code>
刪除卷、池
在這裡刪除卷和池。首先要卸載分區。
<code>[root@localhost ~]# umount /mnt/volume1/
# 刪除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
/<code>
然後從物理卷裡面把/dev/sdb,/dev/sdc,/dev/sdd移除掉。
<code>[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.
/<code>總結
SSM通過創建統一的用戶界面來緩解這一問題。
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