Configure any RAID functions provided by the mainboard of your computer, or attached controller cards, before you begin the installation process.
Software RAID. On systems with more than one hard drive, you can use the Red Hat Enterprise Linux installation program to operate several of the drives as a Linux software RAID array. These functions are explained in detail in Section 8.
USB Disks. You can connect and configure external USB storage after installation. For more information, see mdadm 8 man page. Optionally, to observe the detailed information about each RAID device, use the following command:. For more information, see mkfs man page. To create a mount point for RAID drive and mount it, use the following commands:.
In this section you will learn how to set up an Ansible playbook with the available parameters to configure a RAID volume to suit your requirements. You have Red Hat Ansible Engine installed on the system from which you want to run the playbook. You do not have to have Red Hat Ansible Automation Platform installed on the systems on which you want to deploy the storage solution. Create a new playbook. Device names can change in certain circumstances; for example, when you add a new disk to a system.
Therefore, to prevent data loss, we do not recommend using specific disk names in the playbook. The section below describes how to modify an existing RAID. To do so, choose one of the methods:. This chapter below describes how to reshape RAID. You can choose one of the methods of resizing RAID:. This procedure describes how to enlarge RAID. To extend RAID to the maximum of the partition capacity, use this command:. This procedure describes how to shrink RAID. Shrink the file system. To do so, check the Managing file systems documentation.
Note, you must write the --size parameter in kB. This chapter describes supported conversions in RAID and contains procedures to accomplish those conversions. It is possible to convert from one RAID level to another. This section provides a table that lists supported RAID conversions.
In some cases, you may wish to install the operating system on an array that can not be created after the installation completes. To work around this, perform the following procedure:. The limited Rescue Mode of the installer does not include man pages. Both the man mdadm and man md contain useful information for creating custom RAID arrays, and may be needed throughout the workaround.
As such, it can be helpful to either have access to a machine with these man pages present, or to print them out prior to booting into Rescue Mode and creating your custom arrays. This module describes how to set up the RAID monitoring option with mdadm tool.
To do so, use the following command:. For example, add new line:. After you complete the steps above, the monitoring system will send the alerts to the email address. This procedure describes how to replace the faulty disk in a redundant array of independent disks RAID. Check if the faulty disk was masked correctly by using the following command:.
Finally, remove the faulty disk from the array. To do so, enter the following command:. At the end of the last command output you will see information about RAID disks similar to this:.
This procedure describes how to replace the broken disk in a redundant array of independent disks RAID. Add the new disk to the array as a spare one. Mark the broken disk as faulty. Remove the faulty disk from the array. This procedure describes how to resynchronize disks in a RAID array.
To check the array for the failed disks behavior, enter the following command:. Redundant array of independent disks RAID. Enhances speed Increases storage capacity using a single virtual disk Minimizes data loss from disk failure RAID layout and level online conversion.
Level 0 RAID level 0, often called striping , is a performance-oriented striped data mapping technique. Level 1 RAID level 1, or mirroring , provides redundancy by writing identical data to each member disk of the array, leaving a "mirrored" copy on each disk.
Level 4 Level 4 uses parity concentrated on a single disk drive to protect data. Level 6 This is a common level of RAID when data redundancy and preservation, and not performance, are the paramount concerns, but where the space inefficiency of level 1 is not acceptable. Level 10 This RAID level attempts to combine the performance advantages of level 0 with the redundancy of level 1.
Prerequisites You have selected two or more disks for installation before RAID configuration options are visible. At least two disks are required to create a RAID device. You have created a mount point. By configuring a mount point, you configure the RAID device. You have selected the Custom radio button on the Installation Destination window. Procedure From the left pane of the Manual Partitioning window, select the required partition. Under the Device s section, click Modify.
Creating software RAID partitions on physical hard drives. To configure software RAID, select Create custom layout from the pulldown list on the Disk Partitioning Setup screen, click the Next button, and follow the instructions in the rest of this section.
In a typical situation, the disk drives are new or are formatted. Both drives are shown as raw devices with no partition configuration in Figure 6. Click OK to confirm the choice. A software RAID partition must be constrained to one drive.
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