[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?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 486 bytes
Desc: not available
URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20181030/5dbd8cad/attachment.sig>


More information about the gpfsug-discuss mailing list