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<p class=MsoNormal><span style='color:#1F497D'>Hi Jerome,<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'>Thanks for pointing out that
script – sometimes the obvious answer is there staring you in the face </span><span
style='font-family:Wingdings;color:#1F497D'>J</span><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'>Were there any major differences
in the configurations of the old and new hardware, i.e. did you need to make
them appear as similar as possible or was this not necessary?<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'>Daniel.<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 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"'> Jerome, Ron
[mailto:Ron.Jerome@nrc-cnrc.gc.ca] <br>
<b>Sent:</b> 16 November 2009 14:31<br>
<b>To:</b> Hagon, Daniel (STFC,RAL,SSTD); lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> RE: [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-US style='color:#1F497D'>Hi Daniel,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US 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 lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>_________________________________________<o:p></o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>Ron Jerome<o:p></o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>Programmer/Analyst<o:p></o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>National Research Council Canada<o:p></o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>1200 Montreal Road, Ottawa, Ontario K1A
0R6<o:p></o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>Government of Canada<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Times New Roman","serif";
color:#1F497D'> </span><span lang=EN-US style='color:#1F497D'><o:p></o:p></span></p>
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<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"'> 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><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal>Hi,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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></p>
<pre><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></pre><pre><span
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><o:p> </o:p></p>
<p class=MsoNormal>“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></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Many thanks,<o:p></o:p></p>
<p class=MsoNormal>Daniel.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>*******************************************************<o:p></o:p></p>
<p class=MsoNormal>British Atmospheric Data Centre<o:p></o:p></p>
<p class=MsoNormal>STFC Rutherford Appleton Laboratory<o:p></o:p></p>
<p class=MsoNormal>Chilton, Didcot, Oxfordshire, OX11 0QX<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-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<p>-- <br>
Scanned by iCritical. <o:p></o:p></p>
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