Question

DDB Q&I performance critical - 5,000 - 9,000 ms

  • 18 September 2023
  • 2 replies
  • 33 views

Userlevel 2
Badge +10

Hello Commvault,

I try to find a workaround in order to reduce a DDB Q&I times.

The DDB is currently 238 TB, based in Shared partitions (Azure Blob Storage).

Average Q&I times was 9,000ms (in Premium SSD (P15) in Azure VM, single Drive.

 

After split “DDB paths” (to separate Disks) and add another 2 X SSD (for DDB partitions), currently average Q&I times was reduced to 5,200ms.

 

Is there any way to succeed better performance?

Maybe to Seal the DDB ?


2 replies

Userlevel 7
Badge +18

I can't believe the DDB itself is 238TB in size, so I expect this to be the footprint of written data towards Azure Blob Storage that is related to the DDB. Is it a single MA with one DDB? Which version are you running?

The problem in Azure was always that there wasn't a decent low latency storage offering available and you have to create a stripe set spanning multiple disks to get more IOps, but still latency sucked and was not very consistent. Nowadays you can pick Premium SSD v2 or go for Ultra Disk, but before moving towards a different storage offering please make sure your DDB is optimized to have the latest enhancement enabled such as garbage collection and that it doesn't contain a lot of white space as this also impacts performance. The documentation contains a lot of information, but you can always consider opening a ticket and have someone from support to perform a quick assessments. 
 

Userlevel 2
Badge +10

I can't believe the DDB itself is 238TB in size, so I expect this to be the footprint of written data towards Azure Blob Storage that is related to the DDB. Is it a single MA with one DDB? Which version are you running?
 

Hi @Onno van den Berg 

Your right, 236 TB is the Application Size.

DDB size is ~95 GB in a single MA (VM Server in Azure).
Before some days I split the DDB partitions from a single Drive  -→  4 X separate Premium SSD (P15) Drives.
(That’s why last 3 days performance is better).

Here is a screenshot:

Probably, I will go for a new ticket, but Im afraid the answer will be again just upgrade your SSD tier...

That’s why I write it in Commvault Community!

Thank you in advance!

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