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AS400 Restore operations

  • 12 August 2024
  • 4 replies
  • 26 views

Hello,

I have configured Commvault to Protect AS400 and the progress of Backup is good it takes a few mins, but for restore operations it takes a time like 5 hours comparison to backup complete in 45 mins

 

does anyone have some advice?

 

4 replies

A
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Userlevel 6
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Hello @Mohamed Nabil 

 

There is a log located on the Media agent performing the writes during the backup and reads during the restore called “CVPerfMgr” and CVPerfMgrRestore”

 

A full consolidation of each stream once it is closed is written into this log. I recommend reviewing this log to see where the bottle necks are and then focus the troubleshooting that way. 


If you like please share a copy of the log and JobID and i can have a look.

 

Kind regards

Albert Williams

The best way to learn anything, is to question everything
M
Badge +1

Hello Albert,

Thanks for your interest in this thread, I have uploaded the logs as you mentioned

feel free to review and help me to get the root cause.

A
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Userlevel 6
Badge +15

Hello @Mohamed Nabil 

I am not sure the Job Id you want to review but assuming it is job “168” as it is the latest restore in that log. 

We can see the following performance stats: 

Read speed from the library by MA “COMMVOULT”: 

|*20*|*Perf*|168|  |_Restore READ.............................................................       388              110519314939  [102.93 GB]  [Samples - 1000] [Avg - 0.388000] [955.01 GBPH]


Network speed between “COMMVOULT” and “COMMVAULT-01”

|*20*|*Perf*|168|  |_SDT-Head: Network transfer...............................................     18403              110753323334  [103.15 GB]  [Samples - 5115877] [Avg - 0.003597] [20.18 GBPH]

Restore Write time on server “COMMVAULT-01”

|*20*|*Perf*|168|  |_Restore Write............................................................     18134              319010811456  [297.10 GB]  [Samples - 1183231552] [Avg - 0.000015] [58.98 GBPH]

 

From these 3 stats we can see that we are spending 18403 seconds sending the data on the network and 18134 seconds writing the data on the client.  Between the two possible causes i would say it is network given the high amount of wait time on the client.

The slow network causes the writer to wait for more data but does not close so it seems more active then it is. 

 

I recommend performing a bench mark performance of your network between these two servers using the CVNetworkTestTool to see what speeds you can get outside of CV and if they are different. 

https://documentation.commvault.com/2023e/expert/checking_network_connectivity_using_network_test_tool.html

 

If you get the same results on a single stream test, the issue is not Commvault and you need to fix your network speed. if they are different i recommend a support ticket with your findings so they can guide you on tuning the performance better. 

 

NOTE: It is not recommended to post an entire log into community as the top of the log contains you host name, IP address and details of your Commserv. Its recommend to just post the relevant logs in the future. 

 

Kind regards

Albert Williams
 

The best way to learn anything, is to question everything
M
Badge +1

Thanks albert, your analysis is so insightful, and i agree with your advice 😅 

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