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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks Kevin and J-F, I appreciate your thoughts.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I’ll go with “no” then as my answer
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US">J</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Richard<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" 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>Kevin D Johnson<br>
<b>Sent:</b> 09 March 2017 19:48<br>
<b>To:</b> gpfsug-discuss@spectrumscale.org<br>
<b>Cc:</b> gpfsug-discuss@spectrumscale.org<br>
<b>Subject:</b> Re: [gpfsug-discuss] Running gpfs.snap outside of problems<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif">I've never heard of running a gpfs.snap every few hours, but it is technically possible. Probably not advisable except in the most limited of circumstances. I wouldn't do it
unless Support or another technical resource you trust says to do so.<br>
<br>
You can limit the snap to run on a few nodes versus a whole cluster and that way limit the effect it has overall. You can also specify a directory outside GPFS to write the snap file. <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Kevin D. Johnson, MBA, MAFM<br>
</span></b><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Spectrum Computing, Senior Managing Consultant<br>
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<span style="color:dimgray">IBM Certified Deployment Professional - Spectrum Scale V4.1.1<br>
IBM Certified Deployment Professional - Cloud Object Storage V3.8</span></span></b><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:dimgray">IBM Certified Solution Advisor - Spectrum Computing V1</span></b><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:dimgray">720.349.6199 - kevindjo@us.ibm.com</span></b><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif">----- Original message -----<br>
From: Jan-Frode Myklebust <janfrode@tanso.net><br>
Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>
To: "gpfsug-discuss@spectrumscale.org" <gpfsug-discuss@spectrumscale.org><br>
Cc:<br>
Subject: Re: [gpfsug-discuss] Running gpfs.snap outside of problems<br>
Date: Thu, Mar 9, 2017 11:30 AM<br>
<br>
<br>
There's a manual for it now.. and it points out "The tool impacts performance.." Also it has caused mmfsd crashes for me earlier, so I've learned to be weary of running it..<br>
<br>
The manual also says it's collecting using mmfsadm, and the mmfsadm manual warns that it might cause GPFS to fail ("in certain rare cases").<br>
<br>
I wouldn't dare running it every few hours.<br>
<br>
<br>
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-jf <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif">tor. 9. mar. 2017 kl. 17.12 skrev Sobey, Richard A <<a href="mailto:r.sobey@imperial.ac.uk" target="_blank">r.sobey@imperial.ac.uk</a>>:<o:p></o:p></span></p>
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<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif">Hi all,<o:p></o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif">Is there any best practice as to when to run a gpfs.snap, and the impact it will have on a healthy cluster? Some of my colleagues are keen to gather a snap for example every 2 hours to assist
in problem determination.<o:p></o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif">I can elaborate on the “why” part of this if needed but I’m not fully convinced it would help. Said I’d look into it though so I’m asking the question.<o:p></o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif"> <o:p></o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif">Cheers<o:p></o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial",sans-serif">Richard<o:p></o:p></span></p>
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