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<p class="MsoNormal"><span style="font-size:12.0pt">Check out \u201cunmountOnDiskFail\u201d config parameter perhaps?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><a href="https://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.3/com.ibm.spectrum.scale.v4r23.doc/bl1adm_tuningguide.htm">https://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.3/com.ibm.spectrum.scale.v4r23.doc/bl1adm_tuningguide.htm</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><b><span style="font-size:12.0pt;font-family:"Courier New";color:#323232">unmountOnDiskFail<o:p></o:p></span></b></p>
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<span style="font-size:12.0pt;font-family:"Helvetica Neue";color:#323232">The </span><b><span style="font-size:12.0pt;font-family:"Courier New";color:#323232;border:none windowtext 1.0pt;padding:0in">unmountOnDiskFail</span></b><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:#323232"> specifies
how the GPFS daemon responds when a disk failure is detected. The valid values of this parameter are yes, no, and meta. The default value is no.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">I have it set to \u201cmeta\u201d which prevents the file system from unmounting if an NSD fails and the metadata is still available. I have 2 replicas of metadata and one data.<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Bob Oesterlin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Sr Principal Storage Engineer, Nuance<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black"><gpfsug-discuss-bounces@spectrumscale.org> on behalf of "Buterbaugh, Kevin L" <Kevin.Buterbaugh@Vanderbilt.Edu><br>
<b>Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Date: </b>Thursday, February 8, 2018 at 10:15 AM<br>
<b>To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Subject: </b>[EXTERNAL] [gpfsug-discuss] mmchdisk suspend / stop<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a name="_MailOriginalBody"><span style="font-size:13.5pt;font-family:"-webkit-standard",serif;color:black">So \u2026 what I was wondering if I could do is to use mmchdisk to either suspend or (preferably) stop those NSDs, do the firmware upgrade,
and resume the NSDs? The problem I see is that suspend doesn\u2019t stop I/O, it only prevents the allocation of new blocks \u2026 so, in theory, if a user suddenly decided to start using a file they hadn\u2019t needed for 3 months then I\u2019ve got a problem. Stopping all
I/O to the disks is what I really want to do. However, according to the mmchdisk man page stop cannot be used on a filesystem with replication set to one.</span></a><span style="mso-bookmark:_MailOriginalBody"></span><o:p></o:p></p>
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