Example 1: Add a device to the RAID array The highlighted text in the previous image shows the basic syntax to manage RAIDs: # mdadm -manage RAID options devices
Keep this fact in mind to avoid running into trouble further down the road. Note that if you omit the -manage option, mdadm assumes management mode anyway.
Mark an array as ro (read-only) or rw (read-write). Replacing the faulty device with a spare one. Removing a faulty device from the array. To see what are the tasks that mdadm -manage will allow us to perform and how: Manage RAID with mdadm ToolĪs we can see in the above image, managing a RAID array involves performing the following tasks at one time or another: Thus, let’s start by typing: # mdadm -manage -help Understanding mdadm Options and Usageįortunately, mdadm provides a built-in -help flag that provides explanations and documentation for each of the main options. That said, feel free to go ahead and add this page to your browser’s bookmarks, and let’s get started. RAID Testing ScenarioĪs in the last article of this series, we will use for simplicity a RAID 1 (mirror) array which consists of two 8 GB disks ( /dev/sdb and /dev/sdc) and an initial spare device ( /dev/sdd) to illustrate, but the commands and concepts listed herein apply to other types of setups as well. 
In this tutorial we will review the functionality provided by this tool so that you can have it handy when you need it.
Manage Raid Devices with Mdadm in Linux – Part 9 Regardless of your previous experience with RAID arrays, and whether you followed all of the tutorials in this RAID series or not, managing software RAIDs in Linux is not a very complicated task once you have become acquainted with mdadm -manage command.
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