<div dir="ltr"><div>Thanks Olaf, that's good to know (and is kind of what I suspected). I've requested a number of times this capability for those of us who can't use or aren't using GNR and the answer is effectively "no". This response is curious to me because I'm sure IBM doesn't believe that data integrity is only important and of value to customers who purchase their hardware *and* software.<br><br></div>-Aaron<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jun 30, 2017 at 1:37 PM, Olaf Weiser <span dir="ltr"><<a href="mailto:olaf.weiser@de.ibm.com" target="_blank">olaf.weiser@de.ibm.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font size="2" face="sans-serif">yes.. in case of GNR (GPFS native raid)
.. we do end-to-end check-summing ... client --> server -->
downToDisk</font><br><font size="2" face="sans-serif">GNR writes down a chksum to disk (to
all pdisks /all "raid" segments ) so that dropped writes
can be detected as well as miss-done writes (bit flips..) </font><br><br><br><br><font size="1" color="#5f5f5f" face="sans-serif">From:
</font><font size="1" face="sans-serif">Aaron Knister <<a href="mailto:aaron.s.knister@nasa.gov" target="_blank">aaron.s.knister@nasa.gov</a>></font><br><font size="1" color="#5f5f5f" face="sans-serif">To:
</font><font size="1" face="sans-serif">gpfsug main discussion
list <<a href="mailto:gpfsug-discuss@spectrumscale.org" target="_blank">gpfsug-discuss@spectrumscale.<wbr>org</a>></font><br><font size="1" color="#5f5f5f" face="sans-serif">Date:
</font><font size="1" face="sans-serif">06/30/2017 07:15 PM</font><br><font size="1" color="#5f5f5f" face="sans-serif">Subject:
</font><font size="1" face="sans-serif">[gpfsug-discuss]
Fwd: FLASH: IBM Spectrum Scale (GPFS): RDMA-enabled network adapter failure
on the NSD server may result in file IO error (2017.06.30)</font><br><font size="1" color="#5f5f5f" face="sans-serif">Sent by:
</font><font size="1" face="sans-serif"><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target="_blank">gpfsug-discuss-bounces@<wbr>spectrumscale.org</a></font><br><hr noshade><div class="HOEnZb"><div class="h5"><br><br><br><tt><font size="2">I'm curious to know why this doesn't affect GSS/ESS?
Is it a feature of <br>the additional check-summing done on those platforms?<br><br><br>-------- Forwarded Message --------<br>Subject:
FLASH: IBM Spectrum Scale (GPFS): RDMA-enabled network adapter
<br>failure on the NSD server may result in file IO error (2017.06.30)<br>Date: Fri,
30 Jun 2017 14:19:02 +0000<br>From: IBM
My Notifications <<a href="mailto:mynotify@stg.events.ihost.com" target="_blank">mynotify@stg.events.ihost.com</a><wbr>><br>To: <a href="mailto:aaron.s.knister@nasa.gov" target="_blank">aaron.s.knister@nasa.gov</a><br><br><br><br><br>My Notifications for Storage - 30 Jun 2017<br><br>Dear Subscriber (<a href="mailto:aaron.s.knister@nasa.gov" target="_blank">aaron.s.knister@nasa.gov</a>),<br><br>Here are your updates from IBM My Notifications.<br><br>Your support Notifications display in English by default. Machine <br>translation based on your IBM profile<br>language setting is added if you specify this option in My defaults <br>within My Notifications.<br>(Note: Not all languages are available at this time, and the English <br>version always takes precedence<br>over the machine translated version.)<br><br>------------------------------<wbr>------------------------------<wbr>------------------<br>1. IBM Spectrum Scale<br><br>- TITLE: IBM Spectrum Scale (GPFS): RDMA-enabled network adapter failure
<br>on the NSD server may result in file IO error<br>- URL: <br></font></tt><a href="http://www.ibm.com/support/docview.wss?uid=ssg1S1010233&myns=s033&mynp=OCSTXKQY&mynp=OCSWJ00&mync=E&cm_sp=s033-_-OCSTXKQY-OCSWJ00-_-E" target="_blank"><tt><font size="2">http://www.ibm.com/support/<wbr>docview.wss?uid=ssg1S1010233&<wbr>myns=s033&mynp=OCSTXKQY&mynp=<wbr>OCSWJ00&mync=E&cm_sp=s033-_-<wbr>OCSTXKQY-OCSWJ00-_-E</font></tt></a><tt><font size="2"><br>- ABSTRACT: IBM has identified an issue with all IBM GPFS and IBM <br>Spectrum Scale versions where the NSD server is enabled to use RDMA for
<br>file IO and the storage used in your GPFS cluster accessed via NSD <br>servers (not fully SAN accessible) includes anything other than IBM <br>Elastic Storage Server (ESS) or GPFS Storage Server (GSS); under these
<br>conditions, when the RDMA-enabled network adapter fails, the issue may
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