<html><body><p><font size="2" face="sans-serif">Thanks Stephan.</font><br><font size="2" face="sans-serif">This will be looked into and accordingly prioritized by the offering manager team. Incase the IBM team has any further questions on this then we will get back to you.</font><br><br><font size="2" face="sans-serif">Regards, The Spectrum Scale (GPFS) team<br><br>------------------------------------------------------------------------------------------------------------------<br>If you feel that your question can benefit other users of Spectrum Scale (GPFS), then please post it to the public IBM developerWroks Forum at <a href="https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479">https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479</a>. <br><br>If your query concerns a potential software error in Spectrum Scale (GPFS) and you have an IBM software maintenance contract please contact 1-800-237-5511 in the United States or your local IBM Service Center in other countries. <br><br>The forum is informally monitored as time permits and should not be used for priority messages to the Spectrum Scale (GPFS) team.</font><br><br><img width="16" height="16" src="cid:1__=0ABB02CFDFF542A98f9e8a93df938690@ibm.com" border="0" alt="Inactive hide details for "Stephan Graf" ---09-06-2022 11.31.01 AM---Hi, I have create an IDEA for it:"><font size="2" color="#424282" face="sans-serif">"Stephan Graf" ---09-06-2022 11.31.01 AM---Hi, I have create an IDEA for it:</font><br><br><font size="1" color="#5F5F5F" face="sans-serif">From: </font><font size="1" face="sans-serif">"Stephan Graf" <st.graf@fz-juelich.de></font><br><font size="1" color="#5F5F5F" face="sans-serif">To: </font><font size="1" face="sans-serif"><gpfsug-discuss@gpfsug.org></font><br><font size="1" color="#5F5F5F" face="sans-serif">Date: </font><font size="1" face="sans-serif">09-06-2022 11.31 AM</font><br><font size="1" color="#5F5F5F" face="sans-serif">Subject: </font><font size="1" face="sans-serif">[EXTERNAL] Re: [gpfsug-discuss] Protection against silent data corruption</font><br><font size="1" color="#5F5F5F" face="sans-serif">Sent by: </font><font size="1" face="sans-serif">"gpfsug-discuss" <gpfsug-discuss-bounces@gpfsug.org></font><br><hr width="100%" size="2" align="left" noshade style="color:#8091A5; "><br><br><br><tt><font size="2">Hi,<br><br>I have create an IDEA for it: <br></font></tt><tt><font size="2"><a href="https://ibm-sys-storage.ideas.ibm.com/ideas/GPFS-I-851">https://ibm-sys-storage.ideas.ibm.com/ideas/GPFS-I-851</a></font></tt><tt><font size="2"><br><br>Stephan<br><br><br>Am 08.06.2022 um 20:35 schrieb IBM Spectrum Scale:<br>> Hi Stephen,<br>> <br>> Currently such a feature is not available in Spectrum Scale product.<br>> <br>> <br>> Regards, The Spectrum Scale (GPFS) team<br>> <br>> ------------------------------------------------------------------------------------------------------------------<br>> If you feel that your question can benefit other users of Spectrum <br>> Scale (GPFS), then please post it to the public IBM developerWroks Forum <br>> at <br>> </font></tt><tt><font size="2"><a href="https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479">https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479</a></font></tt><tt><font size="2"> <br>> <</font></tt><tt><font size="2"><a href="https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479">https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479</a></font></tt><tt><font size="2">>. <br>> <br>> <br>> If your query concerns a potential software error in Spectrum Scale <br>> (GPFS) and you have an IBM software maintenance contract please contact <br>> 1-800-237-5511 in the United States or your local IBM Service Center <br>> in other countries.<br>> <br>> The forum is informally monitored as time permits and should not be used <br>> for priority messages to the Spectrum Scale (GPFS) team.<br>> <br>> Inactive hide details for "Stephen Ulmer" ---02-06-2022 11.32.27 <br>> PM---This only adds a checksum to the NSD wire protocol. The q"Stephen <br>> Ulmer" ---02-06-2022 11.32.27 PM---This only adds a checksum to the NSD <br>> wire protocol. The question was about detecting data corruption<br>> <br>> From: "Stephen Ulmer" <ulmer@ulmer.org><br>> To: "gpfsug main discussion list" <gpfsug-discuss@gpfsug.org><br>> Date: 02-06-2022 11.32 PM<br>> Subject: [EXTERNAL] Re: [gpfsug-discuss] Protection against silent data <br>> corruption<br>> Sent by: "gpfsug-discuss" <gpfsug-discuss-bounces@gpfsug.org><br>> <br>> ------------------------------------------------------------------------<br>> <br>> <br>> <br>> This only adds a checksum to the NSD wire protocol. The question was <br>> about detecting data corruption at rest. -- Stephen On Jun 2, 2022, at <br>> 1:01 PM, Achim Rehor <Achim.Rehor@de.ibm.com> wrote: hi Stephan, <br>> \u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d<br>> <br>> This only adds a checksum to the NSD wire protocol. The question was <br>> about detecting data corruption at rest.<br>> <br>> -- <br>> Stephen<br>> <br>> <br>> On Jun 2, 2022, at 1:01 PM, Achim Rehor <_Achim.Rehor@de.ibm.com_<br>> <</font></tt><tt><font size="2"><a href="mailto:Achim.Rehor@de.ibm.com">mailto:Achim.Rehor@de.ibm.com</a></font></tt><tt><font size="2">>> wrote:<br>> <br>> hi Stephan,<br>> <br>> there is, see mmchconfig man page :<br>> <br>> nsdCksumTraditional<br>> This attribute enables checksum data-integrity checking between a<br>> traditional NSD client node and its NSD server. Valid values are yes<br>> and no. The default value is no.<br>> (Traditional in this context means that the NSD client and server<br>> are configured with IBM Spectrum Scale rather than with IBM Spectrum<br>> Scale RAID.<br>> The latter is a component of IBM Elastic Storage Server (ESS) and of<br>> IBM GPFS Storage Server (GSS).)<br>> <br>> The checksum procedure detects any corruption by the network of the<br>> data in the NSD RPCs that are exchanged between the NSD client and the<br>> server. A checksum error triggers a request to retransmit the message.<br>> <br>> When this attribute is enabled on a client node, the client<br>> indicates in each of its requests to the server that it is using<br>> checksums. The server uses checksums only in<br>> response to client requests in which the indicator is set. A client<br>> node that accesses a file system that belongs to another cluster can<br>> use checksums in the same way.<br>> <br>> You can change the value of the this attribute for an entire cluster<br>> without shutting down the mmfsd daemon, or for one or more nodes<br>> without restarting the nodes.<br>> <br>> Note:<br>> * Enabling this feature can result in significant I/O performance<br>> degradation and a considerable increase in CPU usage.<br>> <br>> * To enable checksums for a subset of the nodes in a cluster, issue<br>> a command like the following one:<br>> mmchconfig nsdCksumTraditional=yes -i -N <subset-of-nodes><br>> <br>> The -N flag is valid for this attribute.<br>> <br>> -- <br>> Mit freundlichen Grüßen / Kind regards<br>> <br>> Achim Rehor<br>> <br>> Technical Support Specialist S\u200bpectrum Scale and ESS (SME)<br>> Advisory Product Services Professional<br>> IBM Systems Storage Support - EMEA<br>> <br>> _Achim.Rehor@de.ibm.com_<br>> <</font></tt><tt><font size="2"><a href="mailto:Achim.Rehor@de.ibm.com">mailto:Achim.Rehor@de.ibm.com</a></font></tt><tt><font size="2">> +49-170-4521194<br>> IBM Deutschland GmbH<br>> Vorsitzender des Aufsichtsrats: Sebastian Krause<br>> Geschäftsführung: Gregor Pillen (Vorsitzender), Nicole Reimer,<br>> Gabriele Schwarenthorer, Christine Rupp, Frank Theisen<br>> Sitz der Gesellschaft: Ehningen / Registergericht: Amtsgericht<br>> Stuttgart, HRB 14562 / WEEE-Reg.-Nr. DE 99369940<br>> <br>> <br>> -----Original Message-----<br>> *From*: Stephan Graf <_st.graf@fz-juelich.de_<br>> <</font></tt><tt><font size="2"><a href="mailto:Stephan%20Graf%20%3cst.graf@fz-juelich.de%3e">mailto:Stephan%20Graf%20%3cst.graf@fz-juelich.de%3e</a></font></tt><tt><font size="2">>><br>> *Reply-To*: gpfsug main discussion list <_gpfsug-discuss@gpfsug.org_<br>> <</font></tt><tt><font size="2"><a href="mailto:gpfsug%20main%20discussion%20list%20%3cgpfsug-discuss@gpfsug.org%3e">mailto:gpfsug%20main%20discussion%20list%20%3cgpfsug-discuss@gpfsug.org%3e</a></font></tt><tt><font size="2">>><br>> *To*: gpfsug-discuss <_gpfsug-discuss@gpfsug.org_<br>> <</font></tt><tt><font size="2"><a href="mailto:gpfsug-discuss%20%3cgpfsug-discuss@gpfsug.org%3e">mailto:gpfsug-discuss%20%3cgpfsug-discuss@gpfsug.org%3e</a></font></tt><tt><font size="2">>><br>> *Subject*: [EXTERNAL] [gpfsug-discuss] Protection against silent<br>> data corruption<br>> *Date*: Thu, 02 Jun 2022 16:31:43 +0200<br>> <br>> Hi,<br>> <br>> I am wondering if there is an option in SS to enable some checking to<br>> detect silent data corruption.<br>> <br>> Form GNR I know that there is End-to-End integrity. So a checksum is<br>> stored in addition.<br>> <br>> The background is that we are facing an issue where in some files<br>> (which<br>> have data replication = 2) the mmrestripefile is reporting, that one<br>> block is mismatching it's copy (the storage cluster is running SS<br>> without GNR).<br>> We have validated that the copied block is fine, but the original<br>> one is<br>> broken (and this is what is returned on read access).<br>> SS right now in our installation is unable to determine which is the<br>> correct one.<br>> Is there any option to enable this kind of feature in SS? If not, does<br>> it make sense to create an "IDEA" for it?<br>> <br>> Stephan<br>> <br>> _______________________________________________<br>> gpfsug-discuss mailing list<br>> gpfsug-discuss at _gpfsug.org_ <</font></tt><tt><font size="2"><a href="http://gpfsug.org">http://gpfsug.org</a></font></tt><tt><font size="2">><br>> _</font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org_">http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org_</a></font></tt><tt><font size="2"><br>> <</font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org">http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org</a></font></tt><tt><font size="2">><br>> _______________________________________________<br>> gpfsug-discuss mailing list<br>> gpfsug-discuss at _gpfsug.org_ <</font></tt><tt><font size="2"><a href="http://gpfsug.org">http://gpfsug.org</a></font></tt><tt><font size="2">>_<br>> __</font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org_">http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org_</a></font></tt><tt><font size="2"><br>> <</font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org">http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org</a></font></tt><tt><font size="2">><br>> <br>> _______________________________________________<br>> gpfsug-discuss mailing list<br>> gpfsug-discuss at gpfsug.org<br>> </font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org">http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org</a></font></tt><tt><font size="2"> <br>> <</font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org">http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org</a></font></tt><tt><font size="2">><br>> <br>> <br>> <br>> <br>> <br>> _______________________________________________<br>> gpfsug-discuss mailing list<br>> gpfsug-discuss at gpfsug.org<br>> </font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org">http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org</a></font></tt><tt><font size="2"><br><br>-- <br>Stephan Graf<br>Juelich Supercomputing Centre<br><br>Phone: +49-2461-61-6578<br>Fax: +49-2461-61-6656<br>E-mail: st.graf@fz-juelich.de<br>WWW: </font></tt><tt><font size="2"><a href="http://www.fz-juelich.de/jsc/">http://www.fz-juelich.de/jsc/</a></font></tt><tt><font size="2"><br>---------------------------------------------------------------------------------------------<br>---------------------------------------------------------------------------------------------<br>Forschungszentrum Juelich GmbH<br>52425 Juelich<br>Sitz der Gesellschaft: Juelich<br>Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498<br>Vorsitzender des Aufsichtsrats: MinDir Volker Rieke<br>Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),<br>Karsten Beneke (stellv. Vorsitzender), Dr. Astrid Lambrecht,<br>Prof. Dr. Frauke Melchior<br>---------------------------------------------------------------------------------------------<br>---------------------------------------------------------------------------------------------<br>[attachment "smime.p7s" deleted by Huzefa H Pancha/India/IBM] _______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at gpfsug.org<br></font></tt><tt><font size="2"><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org">http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org</a></font></tt><tt><font size="2"><br></font></tt><br><br><BR>
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