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6.3. Managing Software RAID
This section discusses software RAID configuration and management after the installation, and covers the following topics:
- Reviewing existing software RAID configuration.
- Creating a new RAID device.
- Replacing a faulty device in an array.
- Adding a new device to an existing array.
- Deactivating and removing an existing RAID device.
- Saving the configuration.
All examples in this section use the software RAID configuration from the previous section.
6.3.1. Reviewing RAID Configuration
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When a software RAID is in use, basic information about all presently active RAID devices are stored in the
/proc/mdstat special file. To list these devices, display the content of this file by typing the following at a shell prompt:
cat /proc/mdstat
cat /proc/mdstat
To determine whether a certain device is a RAID device or a component device, run the command in the following form as
root:
mdadm --query device…
mdadm --query device…
In order to examine a RAID device in more detail, use the following command:
mdadm --detail raid_device…
mdadm --detail raid_device…
Similarly, to examine a component device, type:
mdadm --examine component_device…
mdadm --examine component_device…
While the
mdadm --detail command displays information about a RAID device, mdadm --examine only relays information about a RAID device as it relates to a given component device. This distinction is particularly important when working with a RAID device that itself is a component of another RAID device.
The
mdadm --query command, as well as both mdadm --detail and mdadm --examine commands allow you to specify multiple devices at once.
Example 6.1. Reviewing RAID configuration
Assume the system uses configuration from Figure 6.7, “Sample RAID Configuration”. You can verify that
/dev/md0 is a RAID device by typing the following at a shell prompt:
mdadm --query /dev/md0
~]# mdadm --query /dev/md0
/dev/md0: 125.38MiB raid1 2 devices, 0 spares. Use mdadm --detail for more detail.
/dev/md0: No md super block found, not an md component.
As you can see, the above command produces only a brief overview of the RAID device and its configuration. To display more detailed information, use the following command instead:
Finally, to list all presently active RAID devices, type:
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