Resolving NAS Capacity Error with Two ReadyNAS Units
In this article, we will discuss how to resolve a NAS capacity error using two ReadyNAS Ultra NAS units. We will cover the key concepts related to this topic and provide detailed context to help you understand the process.
Understanding the NAS Capacity Error
The NAS (Network Attached Storage) capacity error occurs when the storage space in the NAS unit is full. In this case, we are using two ReadyNAS Ultra NAS units, one as the primary and the other as the mirror. The mirror unit is reporting 100% used and 0 available, while the primary unit still has 2TB free.
Using mdadm to Check the RAID Array
To check the RAID array and identify the issue, we can use the mdadm command in the terminal. The mdadm command is a tool for managing Linux software RAID arrays.
sudo mdadm --detail /dev/md0
This command will display the details of the RAID array, including the devices that make up the array, the level of RAID, the size of the array, and the state of the array.
Resolving the Capacity Error
To resolve the capacity error, we need to increase the storage space in the NAS unit. This can be done by adding more hard drives to the array or by replacing the existing hard drives with larger ones.
Before adding or replacing the hard drives, it is important to back up all data in the NAS unit to prevent data loss. Once the data is backed up, the hard drives can be added or replaced, and the RAID array can be rebuilt.
sudo mdadm --add /dev/md0 /dev/sdb1
This command will add the new hard drive (/dev/sdb1) to the RAID array (/dev/md0). The RAID array will then be rebuilt, incorporating the new hard drive into the array.
- The NAS capacity error occurs when the storage space in the NAS unit is full.
- To resolve the capacity error, we need to increase the storage space in the NAS unit by adding or replacing hard drives.
- The
mdadmcommand can be used to check the RAID array and display the details of the array. - It is important to back up all data in the NAS unit before adding or replacing hard drives to prevent data loss.
References
- mdadm man page
- How to Set Up Software RAID1 on a Linux VServer with mdadm
- Manage Your RAID Arrays with mdadm
Note: This article is for informational purposes only. The author is not responsible for any data loss or damage to your NAS unit as a result of following the instructions provided in this article.