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Commserv cpu hitting 100% nightly due to Media Manager process

  • December 18, 2024
  • 3 replies
  • 101 views

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Dealing with nightly high cpu issue….hit plateaus at 100% for several hours. Task manager shows Media Manager process hogging the cpu. This only happens during backup windows and not during the day. Dev support is saying it’s looking like we just have too much happening. It’s 200 VM backup jobs and they’re staggered. Issue only happens when the Incr VM backups run. Does not happen when corresponding Syn full run.

I’ve tried staggering the jobs as much as I can but it only delays the inevitable.

 

Suggestions?

Best answer by Oje Alexis

Turned out to  be we’re just taxing the Media Manager service with too many Backup Copies and Indexing jobs. Working on migrating Indexing role off to spread the load.

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3 replies

Damian Andre
Vaulter
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  • Vaulter
  • 1287 replies
  • December 19, 2024

Hmm, that is peculiar. Mediamanager is managing requests from Media Agents to create/assign new chunk information in the database.

Depending on your configuration, its likely that your synthetic full backups run as single stream, whereas incrementals will use multiple streams and create more load on Media Manager. That could be a significant issue.

I mean, keep progressing with engineering here, and I’m not looking at any logs - but some thoughts:

  1. If the CommServe is virtualized, get your VM admin to check the CPU ready time. High CPU is often masked by oversubscribed resources on the hypervisor, increasing latency and waiting for a CPU slot to become available to execute a request. Good read
  2. Pause data aging during your next backup window and see if that helps
  3. Maybe lower the job watermark or max streams. It may not impact your window all that much if you get higher performance with less streams overall.

Hope that helps!


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  • Author
  • Bit
  • 2 replies
  • December 30, 2024
  • It’s physical
  • There is a data pruning window during the high cpu times
  • Will look into lowering job watermark

We’re also seeing high cpu usage with the SQL service. Devs seem to be focusing their efforts on figuring out what’s causing that to happen. But minimal progress.

Greatly appreciate the response.


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  • Author
  • Bit
  • 2 replies
  • Answer
  • February 28, 2025

Turned out to  be we’re just taxing the Media Manager service with too many Backup Copies and Indexing jobs. Working on migrating Indexing role off to spread the load.


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