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
# 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：# ssm list-----------------------------------------------------------Device Free Used TotalPool Mount point-----------------------------------------------------------/dev/sda 40.00 GB /dev/sda1 1.00 GB /boot /dev/sda24.00 MB38.99 GB39.00 GBcentos /dev/sdb 2.00 GB /dev/sdc 2.00 GB /dev/sdd 2.00 GB -------------------------------------------------------------------------------------------------------------Pool TypeDevices Free Used Total--------------------------------------------------centoslvm 1 4.00 MB38.99 GB39.00 GB----------------------------------------------------------------------------------------------------------------------------------------Volume Pool Volume sizeFS FS size FreeType Mount point--------------------------------------------------------------------------------------/dev/centos/rootcentos 36.99 GBxfs 36.97 GB 34.44 GBlinear/ /dev/centos/swapcentos 2.00 GB linear /dev/sda1 1.00 GBxfs1014.00 MB864.65 MB /boot --------------------------------------------------------------------------------------#https://www.linuxprobe.com/wp-content/uploads/2020/04/sv1.png
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# mkdir /mnt/volume1# 创建逻辑卷# ssm create -s 1G -n lv1 -p vg0 --fstype xfs /dev/sd{b,c,d} /mnt/volume1Physical volume "/dev/sdb" successfully created.Physical volume "/dev/sdc" successfully created.Physical volume "/dev/sdd" successfully created.Volume group "vg0" successfully createdLogical 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=0data = bsize=4096 blocks=262144, imaxpct=25 = sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0 ftype=1log =internal log bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0# 查看是否挂载# df -hFilesystem SizeUsed Avail Use% Mounted ondevtmpfs 898M 0898M 0% /devtmpfs 910M 0910M 0% /dev/shmtmpfs 910M9.6M901M 2% /runtmpfs 910M 0910M 0% /sys/fs/cgroup/dev/mapper/centos-root 37G2.6G 35G 7% //dev/sda1 1014M150M865M15% /boottmpfs 182M 0182M 0% /run/user/0/dev/mapper/vg0-lv1 1014M 33M982M 4% /mnt/volume1https://www.linuxprobe.com/wp-content/uploads/2020/04/sv2.png
--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。https://www.csdn.net/article/a/2020-05-15/15991308
https://article.pchome.net/content-2111667.html# ssm resize -s +2G vg0/lv1Size of logical volume vg0/lv1 changed from 1.00 GiB (256 extents) to 3.00 GiB (768 extents).Logical volume vg0/lv1 successfully resized.# df -hFilesystem SizeUsed Avail Use% Mounted ondevtmpfs 898M 0898M 0% /devtmpfs 910M 0910M 0% /dev/shmtmpfs 910M9.6M901M 2% /runtmpfs 910M 0910M 0% /sys/fs/cgroup/dev/mapper/centos-root 37G2.6G 35G 7% //dev/sda1 1014M150M865M15% /boottmpfs 182M 0182M 0% /run/user/0/dev/mapper/vg0-lv1 3.0G 33M3.0G 2% /mnt/volume1https://www.linuxprobe.com/wp-content/uploads/2020/04/sv3.png创建快照
为lv1逻辑卷创建快照# ssm snapshot /dev/vg0/lv1 Rounding up size to full physical extent 412.00 MiBLogical volume "snap20200325T195111" created.# ssm list snap------------------------------------------------------------------------Snapshot OriginPoolVolume size UsedType------------------------------------------------------------------------/dev/vg0/snap20200325T195111lv1 vg0 412.00 MB0.00 KBlinear删除卷、池
在这里删除卷和池。首先要卸载分区。# umount /mnt/volume1/# 删除vg0池和lv1卷# ssm removevg0Do you really want to remove volume group "vg0" containing 2 logical volumes? : yDo you really want to remove active origin logical volume vg0/lv1 with 1 snapshot(s)? : yLogical volume "snap20200325T195111" successfully removedLogical volume "lv1" successfully removedVolume group "vg0" successfully removedhttps://www.linuxprobe.com/wp-content/uploads/2020/04/sv4.png
然后从物理卷里面把/dev/sdb,/dev/sdc,/dev/sdd移除掉。# 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。
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