LVM procedure for encrypted non-HA systems

You can extend storage capacity of encrypted non-High Availability (HA) systems by using Logical Volume Manager (LVM) procedure.

Before you begin

Warning:

Changing LVM configuration on a QRadar system might result in data loss and data corruption. Always take a full back up of the system before you start LVM procedure.
The LVM procedures only support LVM expansion for systems with logical volume level encryption. Do not perform these procedures on systems with partition or disk level encryption.

Identifying encryption level

The following command helps to identify the encryption level on the system for the /store logical volume:

xfs_info /store | grep meta-data | sed "s/meta-data=//" | cut -d " " -f1

Logical volume encryption gives an output similar to the following:

/dev/mapper/luks-86ceb52c-d656-42f3-b2a3-6157a4ffa7cd

Partition or disk level encryption givez an output similar to the following:

/dev/mapper/rhel-store

Procedure

The following procedures are for non-High Availability (HA) systems with logical volume level encryption.

Add a hard disk to the non-HA system and find the hard disk name by entering the following command:
```
lsblk
```
For example, sdb
Create a partition table on the new hard disk by entering the following command:
```
parted /dev/<HD name> mktable gpt
```
Create a partition for the whole disk by entering the following command:
```
parted /dev/<HD Name> mkpart xfs 1.00Mib 100%
```
Search for the name of the new partition by entering the following command:
```
lsblk
```
Typically, the device name with the number 1 at the end is the partition name.
For example, sdb1
Create the physical volume (PV) for this hard disk by entering the following command:
```
pvcreate /dev/<Partition name>
```
To add the storage, locate the volume group (VG). For example, storerhel is the VG for the /store and /transient directories. Locate VG by entering the following command:
```
vgs
```
Extend the VG to include the space from the new partition by entering the following command:
```
vgextend <Volume Group Name> /dev/<Partition name>
```
Note: This step is only required for all-in-one consoles and console devices.
It is recommended that all-in-one consoles and consoles devices have more storage on the transient and store volume. The transient volume should occupy 20% of the available space and the store volume should occupy 80% of the remaining space. This step is not required for any other type of appliances.
Warning: If you are extending the transient logical volume, you must complete this step before you extend the store logical volume.

Extend the transient logical volume by using 20% of the free space in the VG by entering the following command:
```
lvextend -l +20%FREE /dev/<VG Name>/transient
```
This step extends the amount of free space for the store logical volume. To use this system in a high availability environment, enough space must be available for the Distributed Replicated Block Device (DRBD) metadata in the logical volume. Hence, extend the space for store by 97% of the free space by entering the following command:
```
lvextend -l +97%FREE /dev/<VG Name>/store
```
You can search for the path for the store file system. Generally, the path is /dev/mapper/<VG name>-<LV Name>.
For example, the path for the store file system is /dev/mapper/storerhel-store.
To find the file system name of the /store directory, enter the following command:
```
xfs_info /store | grep meta-data | sed "s/meta-data=//" | cut -d " " -f1
```
Resize the LUKS (Linux® Unified Key Setup) encrypted space to include the space from the store logical volume, the passphrase for the encrypted volume needs to be entered:
```
cryptsetup resize /dev/mapper/luks-<LUKS UUID>
```
Note: If storage was extended on the transient volume, then resize the LUKS encrypted space on that volume as well.
Grow the file system to fill the free space on the store LV by entering the following command:
```
xfs_growfs /dev/mapper/<VG Name>-<LV Name>
```
Note: If storage was extended on the transient volume, you must grow the file system on the transient LV as well.
The file system is expanded to fill the remaining free space in the LV. Type the following command to extend the store LV by 100% of the remaining space in the VG to leave room for the DRBD metadata:
```
lvextend -l +100%FREE /dev/<VG Name>/store
```
Resize the LUKS encrypted space to include the space from the store logical volume by entering the passphrase for the encrypted volume:
```
cryptsetup resize /dev/mapper/luks-<LUKS UUID>
```