[gpfsug-discuss] NSD network checksums (nsdCksumTraditional)

[Aaron Knister]

Flipping through the slides from the recent SSUG meeting I noticed that 
in 5.0.2 one of the features mentioned was the nsdCksumTraditional flag. 
Reading up on it it seems as though it comes with a warning about 
significant I/O performance degradation and increase in CPU usage. I 
also recall that data integrity checking is performed by default with 
GNR. How can it be that the I/O performance degradation warning only 
seems to accompany the nsdCksumTraditional setting and not GNR? As 
someone who knows exactly 0 of the implementation details, I'm just 
naively assuming that the checksum are being generated (in the same 
way?) in both cases and transferred to the NSD server. Why is there such 
a penalty for "traditional" environments?

-Aaron

-- 
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776