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We are in the process of the Mediaagent hardware refresh so while procuring the hardware specifications, I am wondering is it ok to create 2 separate ddbs (one for disk library and one for cloud library) on a single hard drive?
Please advice.
Thank you so much.
Best answer by Mike Struening RETIRED
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Welcome
I would definitely recommend against that. You want to have the fastest drive possible as per your sizing. Our Dedupe Building guide specifies all of the requirements for a DDB’s location/drive:
https://documentation.commvault.com/commvault/v11_sp20/article?p=12411.htm
This section is the most relevant to you:
DDB Backup on Cloud
Deduplication Database (DDB) backup is not recommended on Archive Object Storage, like Glacier, Oracle Archive, Azure Archive, etc.
It is recommended to perform DDB backups to a Disk library. If however a Cloud library is used, create a new Cloud library that does not have the Archive Object Storage enabled (like Amazon S3) as the target and use it for performing both the DDB and Index backups.
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Thank you so much for you quick response Mike. Let me review the documentation.
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Sure thing! A LARGE percentage of dedupe performance issues are tied to not following that guide and undersizing/underperforming hardware.
Let me know if you have any questions.
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So for example if we have one 400Gb raid 0 disk, I should not create 2 seperate ddbs on that one SAS disk. I should have another 400GB sas disk for the cloud backups deduplication. That way i have two seperate SAS disk for each DDB. Correct?
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Ok. Thank you so much once again. :)
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A pleasure! Hope to see you post more new threads 
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I will do now as it is very helpful. Thanks
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