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<p class="MsoNormal"><span style="color:#1F497D">Ben,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I am certain on the scsi_ids. I am using an LVM that is multipathed over IB/SRP<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The disk is only 500GB. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I have mounted it as ldiskfs and compared it to an OST.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">It seems to look like an OST with extra stuff there. In the CONFIGS, it has both an MDT and an OST file.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I wonder if this is from running lfsck_start on it earlier when the system was up.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Brian Andrus<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">ITACS/Research Computing<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Naval Postgraduate School<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Monterey, California<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">voice: 831-656-6238<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Ben Evans [mailto:bevans@cray.com]
<br>
<b>Sent:</b> Thursday, July 30, 2015 10:09 AM<br>
<b>To:</b> Andrus, Brian Contractor; lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> RE: MDT has flags as OST<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I can come up with some unlikely ideas, but it would depend on how your system is set up.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The simplest check would be to mount the suspect device as ldiskfs and take a look at what the directory structure inside looks like (does it have file names like a regular FS (MDT), or a bunch of numbered/lettered
directories (OST))<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If your server is running both an MDT and an OST, use scsi_id to make sure that the devices you think are MDTs and OSTs aren’t actually the same device.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">-Ben Evans<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> lustre-discuss [<a href="mailto:lustre-discuss-bounces@lists.lustre.org">mailto:lustre-discuss-bounces@lists.lustre.org</a>]
<b>On Behalf Of </b>Andrus, Brian Contractor<br>
<b>Sent:</b> Thursday, July 30, 2015 1:02 PM<br>
<b>To:</b> <a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a><br>
<b>Subject:</b> [lustre-discuss] MDT has flags as OST<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Not sure how this is even possible, but our MDT is showing up as an OST when I do ‘tunef2.lustre’<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there a way to change the flags for a disk so it will see it as an MDT again?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Brian Andrus<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">ITACS/Research Computing<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Naval Postgraduate School<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Monterey, California<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">voice: 831-656-6238<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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