Data Domain: Copying or Restoring from the Data Domain System is Taking Too Long

PURPOSE

This document lists steps on how to resolve the problem of bad performance when restoring or copying from the Data Domain.

• All Data Domain models
• All Software Releases
• Common Internet File System (CIFS)
• Network File System (NFS)
• Clone to tape
• Aux copy, Auxiliary copy

SOLUTION

Use the following steps to isolate the cause for the issue and identify the solution. Perform the steps in order. Do not skip a step.

1. Verify that the processors are not 100% used: Data Domain: Reviewing CPU Utilization

Copy and restore processes have to share access to the processor, a busy processor affects the time required to complete the process.

2. Verify that the stream count is not too high: Data Domain: Performance Tuning: Managing Data Streams

Verify that the system is being used within the recommended performance limits.

3. Verify that the network capacity is sufficient per Data Domain: Verifying that Network Connectivity is working properly, Testing Network Bandwidth using the net iPerf Command, and Data Domain: Verifying that Network Connectivity is working properly

As copy and restore processes occur over the network, a busy network affects performance.

Intermittent network problems can also cause performance-related problems.

4. Check for duplicate IP addresses: Data Domain: Identifying Duplicate IPs

A duplicate IP address can cause disconnects during data transfer.

5. Verify that the destination Data Domain has sufficient capacity.

The destination must have equal or greater capacity than the source. This step verifies that the destination Data Domain has been properly sized in conjunction with the replication service.

6. Verify that the cleaning schedule has been followed consistently: Data Domain: Scheduling Cleaning on a DDR

An incorrectly configured cleaning schedule can adversely affect the performance of the Data Domain.

7. Verify that the compression rates are sufficient: Data Domain: How To Determine Compression Rates.

Compression performance of the Data Domain affects copy and restore performance. This step verifies whether the system is getting the expected compression performance.

If the problem persists after completing the steps in this article: 

• Create a service request

And

• Upload a Support Bundle (SUB) (Data Domain: How to collect and upload a support bundle (SUB) from a Data Domain Restorer (DDR)