Valdis will also recall how much "fun" we had with network related corruption due to what we surmised was a TCP offload engine FW defect in a certain 10GbE HCA. Only happened sporadically every few weeks... what a nightmare that was!! -B
-----Original Message----- From: [email protected] <[email protected]> On Behalf Of [email protected] Sent: Tuesday, October 30, 2018 5:14 PM To: gpfsug main discussion list <[email protected]> Subject: Re: [gpfsug-discuss] NSD network checksums (nsdCksumTraditional) [EXTERNAL EMAIL] 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? ________________________________ Note: This email is for the confidential use of the named addressee(s) only and may contain proprietary, confidential, or privileged information and/or personal data. If you are not the intended recipient, you are hereby notified that any review, dissemination, or copying of this email is strictly prohibited, and requested to notify the sender immediately and destroy this email and any attachments. Email transmission cannot be guaranteed to be secure or error-free. The Company, therefore, does not make any guarantees as to the completeness or accuracy of this email or any attachments. This email is for informational purposes only and does not constitute a recommendation, offer, request, or solicitation of any kind to buy, sell, subscribe, redeem, or perform any type of transaction of a financial product. Personal data, as defined by applicable data privacy laws, contained in this email may be processed by the Company, and any of its affiliated or related companies, for potential ongoing compliance and/or business-related purposes. You may have rights regarding your personal data; for information on exercising these rights or the Company’s treatment of personal data, please email [email protected]. _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
