#Ubuntu raid monitor how to
#Ubuntu raid monitor update
#Ubuntu raid monitor full
#Ubuntu raid monitor software

#Ubuntu raid monitor update

If the device is currently degraded, the resync operation will immediately begin using the spare to replace the faulty drive.Īfter you add a spare, update the configuration file to reflect your new device orientation: If the array is not in a degraded state, the new device will be added as a spare. To add a spare, simply pass in the array and the new device to the mdadm -add command: Spares cannot be added to non-redundant arrays (RAID 0) because the array will not survive the failure of a drive.

#Ubuntu raid monitor full

When this happens, the array will resync the data to the spare drive to repair the array to full health. The spare will not be actively used by the array unless an active device fails. Spare devices can be added to any arrays that offer redundancy (such as RAID 1, 5, 6, or 10). The array should now be accessible at the mount point. Once the array is assembled, it can be mounted as usual:

sudo mdadm -assemble /dev/ md0 /dev/ sda /dev/ sdb /dev/ sdc /dev/ sdd.

If the correct definition for the array is missing from the configuration file, the array can still be started by passing in the component devices: This works if the array is defined in the configuration file. To start a specific array, you can pass it in as an argument to mdadm -assemble: To start all arrays defined in the configuration files or /proc/mdstat, type: You will have to reassemble the array to access it again. If you want to stop a specific array, pass it to the mdadm -stop command: You can stop all active arrays by typing: Step outside of the mounted directory and unmount it by typing: To stop an array, the first step is to unmount it. It also provides the current speed and an estimated time until completion.Īfter you have a good idea of what arrays are currently running on your system, there are a number of actions you can take. This this describes the operation currently being applied and the current progress in a number of different ways.

This is often the best way to find the current status of the active arrays on your system: To get detailed information about each of the assembled arrays on your server, check the /proc/mdstat file. This information is similar to that displayed when using the -D option with the array device, but focused on the component device’s relationship to the array. Unused Space : before=130984 sectors, after=0 sectorsĭevice UUID : b0676ef0:73046e93:9d9c7bde:c80352bbīad Block Log : 512 entries available at offset 72 sectorsĪrray State : AAAA ('A' = active, '.' = missing, 'R' = replacing) To get the shortened details for an array, appropriate for adding to the /dev/mdadm/nf file, you can pass in the -brief or -b flags with the detail view:Īrray UUID : 0dc2e687:1dfe70ac:d440b2ac:5828d61dĪvail Dev Size : 209584128 (99.94 GiB 107.31 GB) The information provided in this view is all fairly well labeled. UUID : 0dc2e687:1dfe70ac:d440b2ac:5828d61dįrom this view you can see the RAID level, the array size, the health of the individual pieces, the UUID of the array, and the component devices and their roles. Name : mdadmwrite:0 (local to host mdadmwrite) The important information about the array will be displayed:Īrray Size : 209584128 (199.88 GiB 214.61 GB) To get detailed information about a RAID device, pass the RAID device with the -D or -detail option to mdadm: One of the most essential requirements for proper management is the ability to find information about the structure, component devices, and current state of the array. Querying for Information about RAID Devices This guide will assume that you have one or more arrays to operate on.

#Ubuntu raid monitor how to

Follow our guide on how to create RAID arrays with mdadm on Ubuntu 16.04 to create one or more arrays before starting on this guide. You can follow our Ubuntu 16.04 initial server setup guide to set up an appropriate user.Īs mentioned above, this guide will cover RAID array management. To complete this guide, you will need access to a non-root sudo user. Managing RAID arrays is quite straight forward in most cases. In this guide, we will demonstrate how to manage RAID arrays on an Ubuntu 16.04 server. In a previous guide, we covered how to create RAID arrays with mdadm on Ubuntu 16.04.

#Ubuntu raid monitor software

In Linux, the mdadm utility makes it easy to create and manage software RAID arrays. RAID arrays provide increased performance and redundancy by combining individual disks into virtual storage devices in specific configurations.