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<p class=MsoNormal><span style='color:#1F497D'>Hi Daniel,<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 have done this on a live file
system by deactivating the OSTs, migrating (see section 26.2 of the manual for
a sample script) the data off the OSTs in question, replacing the hardware and
migrating it back. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoPlainText>_________________________________________<o:p></o:p></p>
<p class=MsoPlainText>Ron Jerome<o:p></o:p></p>
<p class=MsoPlainText>Programmer/Analyst<o:p></o:p></p>
<p class=MsoPlainText>National Research Council Canada<o:p></o:p></p>
<p class=MsoPlainText>1200 Montreal Road, Ottawa, Ontario K1A 0R6<o:p></o:p></p>
<p class=MsoPlainText>Government of Canada<o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif";
color:#1F497D'> </span><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-bounces@lists.lustre.org
[mailto:lustre-discuss-bounces@lists.lustre.org] <b>On Behalf Of </b>daniel.hagon@stfc.ac.uk<br>
<b>Sent:</b> November 16, 2009 9:18 AM<br>
<b>To:</b> lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> [Lustre-discuss] Hardware upgrade routes<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-GB>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>I’m interested to find out what
possible solutions there are for upgrading storage hardware within a cluster
over time, either following a failure or just through nodes coming to the end
of their normal working life. We would expect a cluster to exist for many years
whereas the individual nodes may only last a few years each. Ideally it should
be possible to migrate data off an OST as required but there doesn’t
appear to be anything in the manual which covers this use case specifically.<o:p></o:p></span></p>
<pre><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></pre><pre><span
lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>The closest thing seems to be in section 4.3.11 of the manual “Removing and Restoring OSTs” (http://manual.lustre.org/manual/LustreManual18_HTML/ConfiguringLustre.html#50532400_57420):<o:p></o:p></span></pre>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>“OSTs can be removed from and
restored to a Lustre file system. Currently in Lustre, removing an OST really
means that the OST is 'deactivated' in the file system, not permanently
removed. A removed OST still appears in the file system; do not create a new
OST with the same name.”<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Thus one route to migration to new hardware
could be to remove an OST (making sure the name is not reused) then use step
2.5 in section 4.3.11.1 to copy to the _<i>new</i>_ hardware, rather than
recovering to the same hardware.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Does anyone have experience with this type
of use case or knowledge of alternative ways of handling this which they could
describe for me?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Many thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Daniel.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>*******************************************************<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>British Atmospheric Data Centre<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>STFC Rutherford Appleton Laboratory<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Chilton, Didcot, Oxfordshire, OX11 0QX<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>*******************************************************<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<p><span lang=EN-GB>-- <br>
Scanned by iCritical. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
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