Max no of IO streams for DD 670

Hello Everyone,

I would like to know what should be maximum no. of i/o streams for disk pools configured in datadomain 670.

below is more details:

DataDomain - 670

DD OS - 5.4

No. of disk pools created  - 3

Limit I/O Stream - unlimited.

off late we are receiving backup failure with code 2106/2074

I would like to know:

Max no. of concurrent write for datadomain -670

What should be Limit I/O stream count per disk pool.