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Storage accelerator on VSA Proxy

  • December 1, 2025
  • 3 replies
  • 57 views

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Hey,

I was wondering if the VSA Proxy on VMware could have a Storage Accelerator role, so it could write directly to, for example, Flash Blade S3? "So, read data using Hot-Add, then write it to the S3 bucket and send only the metadata to the Media Agent/DDB.

Best answer by Arvind

Good Day ​Zawro,
 

Yes, you can install the Commvault Storage Accelerator (SA) on a VSA proxy in a VMware environment, and it can write backup data directly to a cloud storage target such as Pure FlashBlade S3. Here’s how the setup works and what to keep in mind.
 

How It Works
 

HotAdd Reads:
The VSA proxy reads VM disk data using HotAdd transport mode, giving it efficient block-level access by mounting the VM’s disks locally.

Direct Write to FlashBlade S3:
When the Storage Accelerator role is enabled on the VSA proxy, it can send backup data straight to the S3 bucket (FlashBlade). This avoids routing the data through a separate MediaAgent and operates in “client-direct” mode.
 

Metadata Processing:
Even in client-direct mode, the VSA proxy still communicates with the MediaAgent/DDB for deduplication metadata and index operations. Only the backup data is written directly to cloud storage.
 

Key Points
 

Supported Platforms:
Storage Accelerator is supported on 64-bit Windows and Linux clients, including VSA proxies running on VMware virtual machines. (Not supported on 32-bit OS or Edge Endpoint offline backups.)

Benefits

  • Improves performance by eliminating unnecessary data hops.

  • Reduces MediaAgent load.

  • When scaled across multiple proxies, can deliver very high aggregate throughput.

Fallback Behavior

If the VSA proxy cannot reach the S3 target, it automatically falls back to sending data through the MediaAgent.


Hope this helps with the information, Let me know if any additional questions!

3 replies

Arvind
Vaulter
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  • Vaulter
  • Answer
  • December 1, 2025

Good Day ​Zawro,
 

Yes, you can install the Commvault Storage Accelerator (SA) on a VSA proxy in a VMware environment, and it can write backup data directly to a cloud storage target such as Pure FlashBlade S3. Here’s how the setup works and what to keep in mind.
 

How It Works
 

HotAdd Reads:
The VSA proxy reads VM disk data using HotAdd transport mode, giving it efficient block-level access by mounting the VM’s disks locally.

Direct Write to FlashBlade S3:
When the Storage Accelerator role is enabled on the VSA proxy, it can send backup data straight to the S3 bucket (FlashBlade). This avoids routing the data through a separate MediaAgent and operates in “client-direct” mode.
 

Metadata Processing:
Even in client-direct mode, the VSA proxy still communicates with the MediaAgent/DDB for deduplication metadata and index operations. Only the backup data is written directly to cloud storage.
 

Key Points
 

Supported Platforms:
Storage Accelerator is supported on 64-bit Windows and Linux clients, including VSA proxies running on VMware virtual machines. (Not supported on 32-bit OS or Edge Endpoint offline backups.)

Benefits

  • Improves performance by eliminating unnecessary data hops.

  • Reduces MediaAgent load.

  • When scaled across multiple proxies, can deliver very high aggregate throughput.

Fallback Behavior

If the VSA proxy cannot reach the S3 target, it automatically falls back to sending data through the MediaAgent.


Hope this helps with the information, Let me know if any additional questions!


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  • Author
  • Novice
  • December 1, 2025

 

Thank you for the detailed response. :)


Arvind
Vaulter
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  • Vaulter
  • December 8, 2025

Good Day ​@Zawro,

I’ve edited the Community post with the correct details. The information shared earlier was a bit misleading, so I’ve clarified it to reflect the accurate guidance: Storage Accelerator with VSA is supported.

Let me know if any additional questions, thank you!