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Schedule Policy Randomization?

  • 16 February 2021
  • 7 replies
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Commvault 11.20.   

We’ve been on Commvault for a few years, but our legacy backup product was Tivoli Storage Manager/Spectrum Protect.     In TSM, there was a concept called scheduling randomization which enabled you to assign many clients to one schedule, and you could specify a period in which the various clients would begin their backup operation pseudo-randomly. (Ex. Schedule runs at 22:00. The period is set to 1 hour.  There are 10 clients in the schedule.  The 10 clients start their backup operation at various times in the period between 22:00 and 23:00)  

This enabled you to manage fewer schedules, while spreading backup and client infrastructure resource utilization across a window.  

I can’t find any similar concept with Commvault, but I’d figure I’d ask the community.  

Thanks!

mikeymac

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Best answer by Onno van den Berg 16 February 2021, 21:01

@mikeymac what is the reason behind it to implement a schedule like this? is it to reduce the load on the underlying storage? 

anyhow I would recommend to use plans through Command Center and use an RPO config without a static start time and see how that goes.

the actual checkbos you are looking for is hidden in a traditional schedule policy and is called staggering 
 

See also https://documentation.commvault.com/11.22/expert/6551_job_priorities_and_priority_precedence_online_help.html

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So commvault does not use the same name “ scheduling randomization “ but it sure allows you to assign many clients to one schedule. you can achieve this in different ways but the one simple way that comes to mind, say you have various VCenter Clients or SQL Servers, put them in a group and create a schedule where you can tag that group. 

You can also separate your clients by agent and achieve the same goal. It all depends on how you are structuring your environment.

Take a look at the step 12 where it says to select client computer or client computer group: https://documentation.commvault.com/commvault/v11/article?p=6744.htm

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@mikeymac what is the reason behind it to implement a schedule like this? is it to reduce the load on the underlying storage? 

anyhow I would recommend to use plans through Command Center and use an RPO config without a static start time and see how that goes.

the actual checkbos you are looking for is hidden in a traditional schedule policy and is called staggering 
 

See also https://documentation.commvault.com/11.22/expert/6551_job_priorities_and_priority_precedence_online_help.html

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@Onno van den Berg That’s what I’m looking for!    I’ll give that a shot!   

 

Yes, this is specifically for Oracle RMAN backups that are kicked off in a schedule precisely on the hour.   They run on an HCi platform, and they are CRUSHING the CPU.   Spreading out the load is the goal here.  

 

Thank you so much!

 

Mikeymac

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We can use 2 features for load balancing. Please refer below doc links for details.

Hemant

 

Enabling Job Throttling for Client/Client Groups

https://documentation.commvault.com/commvault/v11_sp20/article?p=111039.htm

Jobs Stagger Time

https://documentation.commvault.com/commvault/v11_sp20/article?p=6551.htm

 

 

 

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It turns out that the MAXIMUM job stagger value is a mere 10 seconds.   

Note: The maximum stagger time allowed is 10 seconds.”   

https://documentation.commvault.com/commvault/v11/article?p=6551.htm    

 

Unfortunately, it’s close to worthless for my use case.   

 

 

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It turns out that the MAXIMUM job stagger value is a mere 10 seconds.   

Note: The maximum stagger time allowed is 10 seconds.”   

https://documentation.commvault.com/commvault/v11/article?p=6551.htm    

 

Unfortunately, it’s close to worthless for my use case.   

 

 


The only workaround I can think of apart from manually staggering the schedules is to manually create associate a pre-process scripts on the subclients with a delay in built.

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We recommend enabling Job Throttling at the Client/Client Groups level for load balancing.

https://documentation.commvault.com/commvault/v11_sp20/article?p=111039.htm

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