lvm disk space for server consolidation

1 LVM 2 will achieve the total disk space "combined" and mount it to the same directory

1.1 Partition

First check disk information on non-partitioned disk partitioning process (select the disk you want to merge, here is vdb, vdc).

Above, it can be seen there is no partition plate 5, selected dev / vdb to partition, as follows:

Input p, and sequentially input the figure:

Finally, view the partition result, as shown:

/ Dev / vdc disc can repeat the above operation.

1.2 Creating Physical Volumes

First check the LVM is not installed, use yum list installed | grep lvm look no installation, if not installed with yum install lvm2 command it.

The command to create a physical volume pvcreate; use the command you want to add to all partitions or create disk volumes group physical volume;

1.3 to create a volume group

Command to create a volume group is vgcreate; use this command to create a complete volume group physical volume pvcreate established;

It will create a physical volume / dev / vdb1 for the volume group named vgmongo of:

1.4 Add a new physical volume into the volume group

This step is the critical step 2 into one of the disk space; when the system or add a new physical disk volume, and to add it to the existing volume group, can use vgextend command;

Adding physical volume / dev / vdc1 to vgmongo volume group:

1.5 View Volume Groups

Check the volume group with vgs:

From the results echo command vgs view volume group vgmongo successfully added, and the total size of the total space for the two physical disks (depending conversion units, so it is not accurate 43G).

1.6 Creating a Logical Volume

Command to create a logical volume lvcreate; use this command to create a logical volume on a volume group created using vgcreate.

在卷组vgmongo上创建一个名为lvmongo的逻辑卷，起大小为39.99G；

-n：指定逻辑卷名 -L：指定逻辑卷大小