If the device is currently degraded, the resync operation will immediately begin using the spare to replace the faulty drive. First, you should see something like the first line of this on your system's log. Now, reconfigure the array to have an additional active device. If you are interested in testing whether your data can survive with a disk less than the usual number, there is no point in being a hot-plug cowboy here.
Visit the following links: Once the resync operation is complete, the device's role numbers are swapped. Prerequisites To complete this guide, you will need access to a non-root sudo user. Stopping an Array To stop an array, the first step is to unmount it.
SCSI bus is being reset for host 0 channel 0. If the device is currently degraded, the resync operation will immediately begin using the spare to replace the faulty drive. This post has some additional information if you would like to know more.
Are you new to LinuxQuestions. We can see that in this example, the array is configured to actively use two devices, and that the total number of devices available to the array is three because we added a spare.
The numbers in the brackets describe the current "role" of the device in the array this affects which copies of data the device is given. The array will begin to reconfigure with an additional active disk. The exact procedure depends slightly on the RAID level you are using.
If you need to remove a drive that does not have a problem, you can manually mark it as failed with the --fail option: Notice that there is no device 3.
Posted by: Yozshugal | on October 2, 2012
Any device with "n" or higher are spare disks. An inactive array is usually faulty.
You should do this with the power off. For a device to be removed, it must first be marked as "failed" within the array.
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