Troubleshooting DASH Copy Performance Issues

If you are experiencing performance issues during DASH copy, you can troubleshoot them by performing the following basic operations:

Symptoms

Slow performance of auxiliary copy operation using DASH option.

Resolution

• Verify Network Latency between Source and Target MediaAgent. Use TestPort utility. This utility allows you to measure the network latency and also available bandwidth.

  • If the Network Latency is low and source copy has deduplication enabled. Use Disk Read Optimization option. This eliminates data rehydration and signature generation at source MediaAgent. See Modifying a Storage Policy Copy Deduplication Settings for instructions.
  • If the Network Latency is high. Use Network Read Optimization option with Enable Use Cache DB. This reduces the signature transfer over the network.

• Verify Deduplication Reduction on a source copy DASH copy can be slow because during this operation large amount of data needs to be transferred over a limited bandwidth. This is because: Identify the jobs/clients/agent type that are getting backed up with lowest amount of deduplication from Job Details and modify the necessary settings on agents to get better deduplication ratio.

  • Type of data may not be deduplicated well.
  • Backup source might have high turnover of data.

See Agents Specific Guidelines to Improve Deduplication Performance for more information.