You'll have to wait until the two partitions are fully synchronized but you can check the sync status using:. After a successful boot, shut the machine down and plug the second drive back in before powering it up again. Once you are satisfied that it works, reboot with both drives plugged in and re-add the first drive to the array:. The easiest way is to enable the checks that are built into the Debian package:.
These checks, performed by the hard disk controllers directly, could warn you of imminent failures ahead of time. Hello, thanks for this entry. I too run raid1 on all my Debian systems so I'll add comments from my experience: If you don't set the metadata to 0.
All my systems run with 1. Easier to use than the array's UUID. Great how to! Thanks for the help! I was having a bear of a time getting step 5 to work.
Turned out that step 4 was doing nothing raid related for me. Which I solved with the following 2 steps. And I can add that, its also possible to make mdadm daemon send email about any fails if the happens. A nice warning system. Awesome tutorial, thank you. The RAID 5 array type is implemented by striping data across the available devices. One component of each stripe is a calculated parity block. If a device fails, the parity block and the remaining blocks can be used to calculate the missing data.
The device that receives the parity block is rotated so that each device has a balanced amount of parity information. As you can see above, we have three disks without a filesystem, each G in size. To create a RAID 5 array with these components, pass them in to the mdadm --create command. The mdadm tool will start to configure the array it actually uses the recovery process to build the array for performance reasons. The second highlighted line shows the progress on the build. Warning: Due to the way that mdadm builds RAID 5 arrays, while the array is still building, the number of spares in the array will be inaccurately reported.
If you update the configuration file while the array is still building, the system will have incorrect information about the array state and will be unable to assemble it automatically at boot with the correct name.
As mentioned above, before you adjust the configuration, check again to make sure the array has finished assembling. Completing this step before the array is built will prevent the system from assembling the array correctly on reboot:.
The output above shows that the rebuild is complete. Now, we can automatically scan the active array and append the file by typing:. The RAID 6 array type is implemented by striping data across the available devices.
Two components of each stripe are calculated parity blocks. If one or two devices fail, the parity blocks and the remaining blocks can be used to calculate the missing data.
The devices that receive the parity blocks are rotated so that each device has a balanced amount of parity information. This is similar to a RAID 5 array, but allows for the failure of two drives. As you can see above, we have four disks without a filesystem, each G in size. To create a RAID 6 array with these components, pass them in to the mdadm --create command. We can automatically scan the active array and append the file by typing:.
This nested array type gives both redundancy and high performance, at the expense of large amounts of disk space. The mdadm utility has its own RAID 10 type that provides the same type of benefits with increased flexibility. It is not created by nesting arrays, but has many of the same characteristics and guarantees. We will be using the mdadm RAID 10 here. The possible layouts that dictate how each data block is stored are:. You can also find this man page online here. To create a RAID 10 array with these components, pass them in to the mdadm --create command.
The layouts are n for near, f for far, and o for offset. The number of copies to store is appended afterwards. For instance, to create an array that has 3 copies in the offset layout, the command would look like this:. The second highlighted area shows the layout that was used for this example 2 copies in the near configuration.
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