R1soft Error: “not enough data in sum file to read BlockSum”

Introduction

This error occurs in R1Soft when creating a backup through CDP (Continuous Data Protection). The issue usually happens after resizing the filesystem or disk volume on the server.

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Prerequisites

• Access to R1Soft CDP Server
• Backup host already added in CDP
• Proper administrative permissions

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Implementation

Error

CDP returns the following error while creating a backup of the server:

Not enough data in the sum file to read BlockSum.

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Cause

This error generally indicates that the filesystem or volume has been resized.

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Resolution

You will need to create a new Disk Safe.

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Steps to Create a New Disk Safe

1. Log in to the CDP Server
2. Navigate to:

Hosts → [IP address of the added host]

3. Click on Disk Safes from the menu
4. Select New Disk Safe from the top-right corner of the page
5. You will receive the prompt:

Continue starting new Disk Safe for 10.5.1.124?

6. Click “Continue” and create the new Disk Safe
   • Leave all settings as the default
7. Initiate the backup again

This will fix the issue.

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Conclusion

By creating a new Disk Safe in R1Soft, the backup process can be reinitialised successfully after filesystem or volume resizing changes.