<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" >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. </div>
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<div dir="ltr" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div dir="ltr" ><div style="font-size: 10pt; font-weight: bold; font-family: sans-serif;" ><div>Kevin D. Johnson, MBA, MAFM<br><span style="font-size: 0.786em;" >Spectrum Computing, Senior Managing Consultant<br><br><span style="color:#696969;" >IBM Certified Deployment Professional - Spectrum Scale V4.1.1<br>IBM Certified Deployment Professional - Cloud Object Storage V3.8</span></span></div>
<div><span style="color:#696969;" ><span style="font-size: 0.786em;" >IBM Certified Solution Advisor - Spectrum Computing V1</span></span></div>
<div> </div>
<div><span style="color:#696969;" ><span style="font-size: 0.786em;" >720.349.6199 - kevindjo@us.ibm.com</span></span></div></div>
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<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- 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><br>-jf
<div><div dir="ltr" >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>>:</div>
<blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex" ><div link="#0563C1" vlink="#954F72" lang="EN-GB" ><div><p>Hi all,</p>
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<p>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.</p>
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<p>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.</p>
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<p>Cheers</p>
<p>Richard</p></div></div>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at <a href="http://spectrumscale.org" rel="noreferrer" target="_blank" >spectrumscale.org</a><br><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank" >http://gpfsug.org/mailman/listinfo/gpfsug-discuss</a></blockquote></div>
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