Reduce the I/O priority of Windows Backup (Windows Server 2008 R2)

Posted by HelloSam on Server Fault See other posts from Server Fault or by HelloSam
Published on 2012-12-13T01:04:10Z Indexed on 2012/12/13 5:06 UTC
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Windows

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backup

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io

I have a PostgreSQL running on Windows Server 2008 R2 x64 box. And I have scheduled a backup everyday from the RAID 1 DB disk to a dedicated standalone disk. They are SAS 15k on Dell PERC 6i. I am using the built-in Windows Server Backup for purpose.

The problem is, whenever the backup process is kicked in, the database performance is hogged. I would say almost a 10x of performance reduction.

From the resource monitor, the disk queue is in the double digit range when backing up, and less than 1 during the day. The disk activity is like ~30-50MB/s during backup, so I guess the hardware is acting normally, though wbengine.exe takes up most of the portions.

I think reduce the IO priority of the backup process would be an answer, but I couldn't find a way to. Tuning process CPU priority does not seems to help.

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