[gpfsug-discuss] NSD network checksums (nsdCksumTraditional)
valdis.kletnieks at vt.edu
valdis.kletnieks at vt.edu
Tue Oct 30 22:14:00 GMT 2018
On Tue, 30 Oct 2018 09:03:06 -0000, Jonathan Buzzard said:
> Noting that on a TCP/IP network anything passing over a TCP connection
> is checksummed at the network layer. Consequently any addition
> checksumming is basically superfluous.
Note that the TCP checksum is relatively weak, and designed in a day when
a 56K leased line was a high-speed long-haul link and 10mbit ethernet was
the fastest thing on the planet. When 10 megabytes was a large transfer,
it was a reasonable amount of protection. But when you get into
moving petabytes of data around, the chances of an undetected error
starts getting significant.
Pop quiz time: When was the last time you (the reader) checked your
network statistics to see what your bit error rate was?
Do you even have the ability to do so?
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