How to handle RAID status "Critical"?


How to handle RAID status "Critical"?

[Root Cause]

The RAID status shows "Critical" because a faulty HDD is detected in the RAID volume. When the RAID status is "critical", there is no fault tolerance in this volume anymore though it is still recording. Once another HDD becomes faulty, recording will be stopped and all data in this RAID volume will be lost. 

For example, if there is 1 faulty HDD in a RAID 5 volume, the RAID status will show "Critical".

When "Critical" is shown on the status, please replace the faulty HDD immediately.


Step 1: Open Internet Explorer, Windows Chrome or Mac Safari and login to the NVR web page.

Step 2: Click RAID & File System / RAID Management then click the Modify tab.

Step 3: Click on the volume you want to modify. The information of this volume will be displayed under the Modify Volume section

Step 4: Remove the faulty HDD:
Select the HDD to be removed. Click "Modify" button.

Check "Yes, I want to modify this volume box", and click "Yes, modify it" button.

Step 5: Remove the faulty HDD from the NVR. Insert a new HDD.

Step 6: Go to Modify Volume again, select "Add Disk", and click the Modify button. 

Check "Yes, I want to modify this volume box", and click "Yes, modify it" button.

Step 7: Modifying RAID volume takes a while, depending on the size of disks. Recording won’t be stopped during the modification, and the data of this RAID volume is fully accessible.

Note: This function is designed for replacing a broken hard drive with a new one, instead of modifying RAID level. In the condition of critical RAID status, it’s a warning to show that one of disks of this RAID volume may be damaged. Even though it’s no impact on the recording function, you’d better to replace a new disk to make sure the volume with data protection mechanism.

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