Hi Pawel, 

Would you be able to give me some further information.

1. Are you talking about the a Commserve, Media Agent or a Client?  (I assume Client, Is so what OS)
2. What are the specifications of the Server?
3. Do you have any antivirus enabled? Are the exclusions in place? 

Regards
Blaine

@Pawel , have you had a chance to look at @Blaine Williams ‘s suggestions?  Let us know if you are still having this issue.

Thanks!

Hi @Pawel,

While we’re awaiting your confirmation of which server this is, I want to also mention the following:

https://documentation.commvault.com/commvault/v11/article?p=11_20_46.htm
 

Maintenance Release 20.46 is available which has a patch for performance issues and will include a patch found in 20.41 as well.

In addition to these patches, if your Commserve is a VM this might be a good time to confirm that it is utilizing the best provisioning for your environment:
https://documentation.commvault.com/commvault/v11/article?p=2801.htm

Note:

• For SQL Server 2014, license is limited to lesser of 4 sockets or 16 cores, or whichever comes first.
• For SQL Server 2016/2017/2019, license is limited to lesser of 4 sockets or 24 cores.
• For SQL Server scheduler, use NUMAs for distributing or scheduling SPID load.
• For VMs with more than 4 sockets, SQL Server uses only the first 4 sockets and considered as a bad VM configuration.
• Each VM socket should have its own NUMA association for SQL Server Schedulers and CPUs with more than 4 per NUMA.
• SQL Server VMs should have matching, dedicated physical CPUs on the VM Host. The VMs must not be shared for best performance.
• SQL Server VMs for database IO drives should have 30 IOPS or better performance

In addition to confirming the provisioning of 50% available memory to SQL server and an ideal cpu configuration for SQL server (strictly speaking for the Commserve server) I also recommend updating to sql server 2014 or 2016 if you are running an older version on the Commserve as we have seen confirmed stability and performance improvements here.

https://documentation.commvault.com/commvault/v11/article?p=7665.htm

I agree with all the potential paths mentionned above to follow.

I’d add that if it’s a Filesystem agent client with the Advanced options to track changes on the files like this : 

If you have lots of files changed after a reboot, or update, this could occur, until the scan is complete.

But, we need to get more background information to properly assist 

Hi @Pawel 

Following up to confirm if you have had a chance to review and if you can confirm if this is for the commserve or a different server