A Reliable and Fast Data Transfer for Grid Systems Using a Dynamic Firewall Configuration

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1 A Reliable and Fast Data Transfer for Grid Systems Using a Dynamic Firewall Configuration Thomas Oistrez Research Centre Juelich Juelich Supercomputing Centre August 21, / 16

2 Overview 1 UNICORE ByteIO GridFTP problems 2 requirements UDP hole punching UDT UNICORE integration 3 performance security 2 / 16

3 UNICORE ByteIO UNICORE ByteIO GridFTP problems how it works data is send via WebService calls default UNICORE protocol stack is used performance complex protocols are used (SOAP / WS / HTTPS) the gateway is a bottleneck security no direct connections between hosts no open server ports needed all data is encrypted 3 / 16

4 GridFTP UNICORE ByteIO GridFTP problems how it works encrypted control connection several data connections in parallel file is split in pieces performance very high to many data connections lead to control overhead security staticly opened ports needed on every server these ports are not used by GridFTP for the most time 4 / 16

5 why we need a new file transfer UNICORE ByteIO GridFTP problems ByteIO is to slow for many applications (max. 400 KBit/s) GridFTP is fast, but it needs an unsecure network configuration a better solution should be easy to install/configure easy to use fast secure 5 / 16

6 requirements requirements UDP hole punching UDT UNICORE integration It can be integrated smoothly into an existing administrative security framework It can be used in open source and in commercial solutions Configuration happens automaticly Configuration is always up to date Connections are allowed for a limited period of time 6 / 16

7 preconditions requirements UDP hole punching UDT UNICORE integration outgoing TCP connections are allowed outgoing UDP packets are allowed (outgoing virtual UDP Connections) one central gateway is needed to exchange control data 7 / 16

8 hole punching requirements UDP hole punching UDT UNICORE integration central gateway service TCP control connection to the gateway information exchange through the gateway UDP Hole Punching data exchange with UDP 8 / 16

9 UDP based Data Transfer (UDT) requirements UDP hole punching UDT UNICORE integration features open source c++ code connection oriented sequence numbers acknowledgments performance flexible congestion control as fair as necessary as fast as possible 9 / 16

10 UNICORE architecture requirements UDP hole punching UDT UNICORE integration 10 / 16

11 requirements UDP hole punching UDT UNICORE integration implementation of the new file transfer implementation control messages are send as WebService calls data is send through a UDT connection 11 / 16

12 performance security performance comparison (1 GBit/s net) ByteIO performance is limited by the protocol stack maximum bandwidth is about 400 KBit/s GridFTP performance depends on the number of connections used in parallel best performance with 4 connections: 300 MBit/s more connections have too much controll overhead 12 / 16

13 performance security performance comparison (1 GBit/s net) UDT performance depends on the congestion control algorithm with the default congestion control, up to 930 MBit/s were possible fairness was very bad with the default algorithm 13 / 16

14 security comparison performance security ByteIO no direct connections between hosts all traffic ist encrypted highest level of security GridFTP control messages are encrypted many staticly opened ports this leads to security holes 14 / 16

15 security comparison performance security UDP Hole Punching no incomming connections allowed outgoing connections are allowed in most environments only really needed connections are allowed for a short period of time control messages are encrypted 15 / 16

16 Questions? performance security Questions? 16 / 16

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