SMB Slowness via PA firewall in Azure Cloud

[MohanDorairaj]

Hi team,

We have deployed PA VM300 series firewall in Azure US West and Azure US East. When a server from US West tries to copy data of 500 Mb to US East server the maximum transfer rate is between 200 - 500 Kbps. When the same file is copied bypassing the firewall, the file transfer rate is 50~60 Mbps.
Tried configuring MSS settings to the interface & application override but nothing helped.

[hshah]

How is East and West Azure connected? 

Are they connected via IPsec? Is IPsec terminated on the firewall?

Is there an Express Route between East and West region?

[MohanDorairaj]

They are connected via Express route. No VPN terminated in the PA firewalls deployed in Azure Cloud.

[Jigar]

What is the latency between the two sides? What we've noticed is that when latency reaches 30-40ms, SMB performance is severely impacted due to the chatty nature of SMB. If you've opened a support case then we can work with you to review the details of your setup and run some tests to diagnose this further. 

[Manjunath]

Its aorund 70 ms...