Thank you for sharing the model number of the drive and according to that this is Midline SAS drive which means Safe IOPs value approx 75 only but all of the drives shows more than 200 IOPs
It means high load on the array causing Performance issue. You need to control the load may be reduce backup jobs from VEEAM to fix this.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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