<div dir="ltr">Dear Sean, <div><br></div><div>Thank you for your answer. I forgot to mention that we are using Lustre v1.8.4 on SLES11.SP0 .</div><div><br></div><div>I would like to ask if there is any possibility to set the files on that target in ro-mode so that no further modifications can be done.</div>
<div><br></div><div>I tried the lfs_migrate on our test system and it was taking far longer to complete than a simple copy. So I thought that 7TB of data objects would take too long to complete. I started a backup (rsync) and every day I update the files till next maintenance where I will run complete e2fsck in order to fix that target.</div>
<div><br></div><div>Regards,</div><div>Stelios</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Aug 13, 2013 at 3:16 PM, Sean Brisbane <span dir="ltr"><<a href="mailto:s.brisbane1@physics.ox.ac.uk" target="_blank">s.brisbane1@physics.ox.ac.uk</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Dear Stelios,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Deactivating an OST prevents newly created files being written to it. It does not prevent the existing files from being modified or deleted.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The existing files on a deactivated OST can be migrated to active servers with the lfs_migrate script. Ideally this will be done at a suitable time of the
week such that the existing files are unlikely to be modified while the migration is progress.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Best,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Sean<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:lustre-discuss-bounces@lists.lustre.org" target="_blank">lustre-discuss-bounces@lists.lustre.org</a> [mailto:<a href="mailto:lustre-discuss-bounces@lists.lustre.org" target="_blank">lustre-discuss-bounces@lists.lustre.org</a>]
<b>On Behalf Of </b>Theodoros Stylianos Kondylis<br>
<b>Sent:</b> 13 August 2013 14:07<br>
<b>To:</b> <a href="mailto:lustre-discuss@lists.lustre.org" target="_blank">lustre-discuss@lists.lustre.org</a><br>
<b>Subject:</b> [Lustre-discuss] Deactivating an OST.<u></u><u></u></span></p><div><div class="h5">
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<p class="MsoNormal">Hello everyone,<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">I am currently facing a situation and I cannot find what I am doing wrong. <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Because of HW probs we have a problematic target. So I deactivated it on the MDS-side. As far as I understand this sets it to ro-mode on the clients. Which means that users can read their data but new writes cannot happen on that target.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">I even tested it on a test system to be sure that this is the case.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">BUT... Today I was scanning for files that have data-objects on that target in order to do a backup of the files and found files with last modification date today. <u></u><u></u></p>
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Also, in the test system while having some files with data-objects on the deactivated target, I could delete them. If I was opening them with vim editing and saving them, then they would be saved outside of the deactivated target. But I don't understand how
could I delete files having data-objects on a deactivated (ro) target.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">So my question is "Have I understood something wrong??" If the target is in ro-mode than how can users modify their data?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Thank you in advance to anyone replying.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Regards,<u></u><u></u></p>
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<p class="MsoNormal">Stelios<u></u><u></u></p>
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