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<p class="MsoNormal">Sorry to hear this. We are dealing with MDT data loss right now as well and its no fun. Please look at my posts to the list from last week for some more information about what we are doing to recover. Our situation is not as bad as yours,
we only lost part of our MDT data (the last 3 months of a filesystem we\u2019ve had in service for over 7 years). If you get to the point where you can get the OST\u2019s attached to a functioning lustre filesystem, you might be able to run an lfsck to move all of
your files into lost+found. We started our lfsck as follows:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span class="line"><span style="font-size:10.0pt;font-family:"Courier New"">[root@hpfs-fsl-mds1 hpfs3-eg3]# lctl lfsck_start -M scratch-MDT0000 -o</span></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When finished, this is on a client:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[root@hpfs-fsl-lmon0 MDT0000]# \ls | head<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20000bdbe:0x1eae1:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20000bdeb:0x12c3e:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20001f801:0x296f:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20001f801:0x57:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20001f801:0x58:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20001f805:0x1000:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20001f805:0x100:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20001f805:0x1001:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20001f805:0x1002:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[0x20001f805:0x1003:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[root@hpfs-fsl-lmon0 MDT0000]# ls -l [0x20000bdbe:0x1eae1:0x0]-R-0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">-r-------- 1 damocles_runner damocles 3162 Sep 24 14:45 [0x20000bdbe:0x1eae1:0x0]-R-0
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[root@hpfs-fsl-lmon0 MDT0000]# pwd<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">/scratch-lustre/.lustre/lost+found/MDT0000<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[root@hpfs-fsl-lmon0 MDT0000]#<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></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">lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Sergey Astafyev via lustre-discuss <lustre-discuss@lists.lustre.org><br>
<b>Reply-To: </b>Sergey Astafyev <astafyev.sergey@gmail.com><br>
<b>Date: </b>Monday, September 25, 2023 at 4:27 AM<br>
<b>To: </b>"lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>[EXTERNAL] [BULK] [lustre-discuss] mds and mst are lost<o:p></o:p></span></p>
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<pre><span class="gmail-y2iqfc"><span lang="EN">Hello.<o:p></o:p></span></span></pre>
<pre><span class="gmail-y2iqfc"><span lang="EN">Please help.<o:p></o:p></span></span></pre>
<pre><span class="gmail-y2iqfc"><span lang="EN">It doesn\u2019t really matter how, but MDS and MDT servers are lost.<o:p></o:p></span></span></pre>
<pre><br><span class="gmail-y2iqfc"><span lang="EN">I connected old OSTs to the new lustre, but I don\u2019t see any information.<o:p></o:p></span></span></pre>
<pre style="margin-bottom:12.0pt"><span class="gmail-y2iqfc"><span lang="EN">lfs find tells me cannot get lov name : inappropriate ioctl for device</span></span><span lang="EN"><br><br><span class="gmail-y2iqfc">Is there any mechanism for recovering information from orphaned OST partitions?</span></span><o:p></o:p></pre>
<pre id="gmail-tw-target-text">best regards<o:p></o:p></pre>
<pre id="gmail-tw-target-text"><span class="gmail-y2iqfc"><span lang="EN">S.Astafev</span></span><o:p></o:p></pre>
<pre id="gmail-tw-target-text"><o:p> </o:p></pre>
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