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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">For non-stretch clusters, I think best practice would be to have an administrator analyze the situation and understand why the NSD was considered unavailable
before attempting to start the disks back in the file system. Down NSDs are usually indicative of a serious issue.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">However I have seen a transient network communication problems or NSD server recovery cause a NSD Client to report a NSD as failed. I would prefer that the FS
manager check first that the NSDs are actually not accessible and that there isn’t a recovery operation within the NSD Servers supporting an NSD before marking NSDs as down. Recovery should be allowed to complete and a NSD client should just wait for that
to happen. NSDs being marked down can cause serious file system outages!!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We’ve also requested that a settable retry configuration setting be provided to have NSD Clients retry access to the NSD before reporting the NSD as failed (<a href="https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=104474">https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=104474</a>
if you want to add a vote!).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Bryan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> gpfsug-discuss-bounces@spectrumscale.org [mailto:gpfsug-discuss-bounces@spectrumscale.org]
<b>On Behalf Of </b>Jan-Frode Myklebust<br>
<b>Sent:</b> Wednesday, August 09, 2017 7:23 AM<br>
<b>To:</b> gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Subject:</b> Re: [gpfsug-discuss] Is GPFS starting NSDs automatically?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><em><span style="font-size:8.5pt;font-family:"Verdana",sans-serif;color:#333333">Note: External Email</span></em><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">If you do a "mmchconfig restripeOnDiskFailure=yes", such a callback will be added for node-join events. That can be quite useful for stretched clusters, where you want to replicate all blocks to both locations,
and this way recover automatically.<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal"> -jf<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Aug 9, 2017 at 2:14 PM, Oesterlin, Robert <<a href="mailto:Robert.Oesterlin@nuance.com" target="_blank">Robert.Oesterlin@nuance.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">By default, GPFS does not automatically start down disks. You could add a callback “downdisk” via mmaddcallback that could trigger a “mmchdisk start” if you wanted. If a disk is
marked down, it’s better to determine why before trying to start it as it may involve other issues that need investigation.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Bob Oesterlin<br>
Sr Principal Storage Engineer, Nuance<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="color:black">From:
</span></b><span style="color:black"><<a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target="_blank">gpfsug-discuss-bounces@spectrumscale.org</a>> on behalf of "<a href="mailto:Tomasz.Wolski@ts.fujitsu.com" target="_blank">Tomasz.Wolski@ts.fujitsu.com</a>"
<<a href="mailto:Tomasz.Wolski@ts.fujitsu.com" target="_blank">Tomasz.Wolski@ts.fujitsu.com</a>><br>
<b>Reply-To: </b>gpfsug main discussion list <<a href="mailto:gpfsug-discuss@spectrumscale.org" target="_blank">gpfsug-discuss@spectrumscale.org</a>><br>
<b>Date: </b>Wednesday, August 9, 2017 at 6:33 AM<br>
<b>To: </b>"<a href="mailto:gpfsug-discuss@spectrumscale.org" target="_blank">gpfsug-discuss@spectrumscale.org</a>" <<a href="mailto:gpfsug-discuss@spectrumscale.org" target="_blank">gpfsug-discuss@spectrumscale.org</a>><br>
<b>Subject: </b>[EXTERNAL] [gpfsug-discuss] Is GPFS starting NSDs automatically?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<span style="color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;font-variant-caps:normal;text-align:start;word-spacing:0px">
<span style="color:black">Does GPFS start “down” disks in a filesystem automatically? For instance, when connection to NSD is recovered, but it the meantime disk was put in “down” state by GPFS. Will GPFS in such case start the disk?</span><o:p></o:p></p>
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_______________________________________________<br>
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<a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</a><o:p></o:p></p>
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