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Azure Page blob : Throttling observed due to IO limit reached

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Applies to

  • CVO
  • AZURE 

Issue

Throttling observed on storage account :
 
Fri Aug 25 21:18:25 0000 [XXXXXXXXXXX: OscHighPriThreadPool: pha.obj.throttle:notice]: PHA Obj throttled 1 times on the blob 01RootBlob-XXXXXXX in the container blobcontainer due to the "AZURE_SERVER_BUSY".
Fri Aug 25 21:22:13 0000 [XXXXXXX-01: OscHighPriThreadPool: pha.obj.throttle:notice]: PHA Obj throttled 1 times on the blob XXXXXXX in the container blobcontainer due to the "AZURE_SERVER_BUSY".
Fri Aug 25 21:22:15 0000 [XXXXXXXXXXXXXX: OscHighPriThreadPool: pha.obj.throttle:notice]: PHA Obj throttled 1 times on the blob preooonqp4zf in the container blobcontainer due to the "AZURE_SERVER_BUSY".

Cause

Azure IO per second limit reached on  Azure console :
 

Degraded :Throttled (CustomerInitiated)At Wednesday, 17 May 2023 at 1:22:13 am SST, the Azure monitoring system received the following information regarding your Storage account:This Storage account was throttled because it exceeded Azure Storage partition request per second , partition bandwidth,or IP scalability limits.
Recommended Steps
•    To minimize impact of intermittent failures,please follow Azure Storage retry guidelines.
•    If Client Throttling is happening continuously please review your partitioning setup  to examine if it is preventing splitting traffic into multiple partitions.
 

Solution

  • Increase the disk size from cloud provider end to get higher IO capacity .
  • Migrate the workload from Pageblob to managed disk where higher IO capacity limit is supported .

Partner Notes

partnerNotes_text
 

Additional Information

Internal Notes

 

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