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Hi Marc,
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<div class="">Read every last one of the thousands of pages of documentation that comprises the GPFS documentation set before doing any GPFS upgrades … yes, I apparently *do* need to do that! ;-)</div>
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<div class="">The paragraph that I find ambiguous can be found on page 20 of the GPFS 4.2 Advanced Administration Guide (3rd paragraph from bottom):</div>
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<p class=""><span style="font-size: 10.000000pt; font-family: 'Palatino'" class="">The placement policy defining the initial placement of newly created files and the rules for placement of
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<p class=""><span style="font-size: 10.000000pt; font-family: 'Times'" class="">| </span><span style="font-size: 10.000000pt; font-family: 'Palatino'" class="">restored data must be installed into GPFS with the
</span><span style="font-size: 10.000000pt; font-family: 'Palatino'; font-weight: 700" class="">mmchpolicy
</span><span style="font-size: 10.000000pt; font-family: 'Palatino'" class="">command. If a GPFS file system does not
</span></p>
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<p class=""><span style="font-size: 10.000000pt; font-family: 'Times'" class="">| </span><span style="font-size: 10.000000pt; font-family: 'Palatino'" class="">have a placement policy installed, all the data is stored in the first data storage pool. Only one
placement </span></p>
<p class=""><span style="font-size: 10.000000pt; font-family: 'Palatino'" class="">policy can be installed at a time. If you switch from one placement policy to another, or make changes to a placement policy, that action has no effect on existing files. However,
newly created files are always placed according to the currently installed placement policy. </span></p>
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<div class="">In my opinion, it should at least contain a pointer the pages you reference below. Preferentially, it would contain the definition of “first data storage pool”.</div>
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<div class="">Thanks…</div>
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<div class="">Kevin</div>
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<div class="">On Jun 17, 2016, at 11:20 AM, Marc A Kaplan <<a href="mailto:makaplan@us.ibm.com" class="">makaplan@us.ibm.com</a>> wrote:</div>
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<div class=""><font size="2" face="Palatino-Bold" class=""><i class="">(Doc?... I ain't about to read a manual! But just to cover our bases we did stick it into the 4.1.1 pubs)</i></font><br class="">
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<font size="2" face="Palatino-Bold" class=""><b class="">Policy improvements:</b></font><br class="">
<font size="2" face="Palatino-Roman" class="">This release includes the following policy improvements:</font><br class="">
<font size="2" face="Palatino-Roman" class=""> ... (summary of changes, page xv) ...</font><br class="">
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<font size="2" face="Palatino-Bold" class=""><b class="">Implicit SET POOL </b></font><font size="2" face="Palatino-Italic" class=""><i class="">'first-data-pool'
</i></font><font size="2" face="Palatino-Bold" class=""><b class="">rule</b></font><br class="">
<font size="2" face="Palatino-Roman" class="">For file systems that are at or have been upgraded to 4.1.1, the system recognizes that,</font><br class="">
<font size="2" face="Palatino-Roman" class="">even if no policy rules have been installed to a file system by
</font><font size="2" face="Palatino-Bold" class=""><b class="">mmchpolicy</b></font><font size="2" face="Palatino-Roman" class="">, data files</font><br class="">
<font size="2" face="Palatino-Roman" class="">should be stored in a non-system pool if available (rather than in the system pool, which</font><br class="">
<font size="2" face="Palatino-Roman" class="">is the default for earlier releases). For more information, see the following:</font><br class="">
<font size="2" face="XyvisionPiOne" class=""> </font><font size="2" face="Palatino-Roman" class="">Information Lifecycle Management chapter in the
</font><font size="2" face="Palatino-Italic" class=""><i class="">IBM Spectrum Scale: Advanced Administration Guide</i></font><br class="">
<br class="">
<font size="2" face="Palatino-Bold" class=""> ... ( mmchpolicy man page 298) ...</font><br class="">
<font size="2" face="Palatino-Bold" class=""><b class="">For file systems that are at or have been upgraded to 4.1.1 or later:
</b></font><font size="2" face="Palatino-Roman" class="">If there are no </font><font size="2" face="Palatino-Bold" class=""><b class="">SET POOL
</b></font><font size="2" face="Palatino-Roman" class="">policy</font><br class="">
<font size="2" face="Palatino-Roman" class="">rules installed to a file system by
</font><font size="2" face="Palatino-Bold" class=""><b class="">mmchpolicy</b></font><font size="2" face="Palatino-Roman" class="">, the system acts as if the single rule
</font><font size="2" face="Palatino-Bold" class=""><b class="">SET POOL</b></font><br class="">
<font size="2" face="Palatino-Roman" class="">'</font><font size="2" face="Palatino-Italic" class=""><i class="">first-data-pool</i></font><font size="2" face="Palatino-Roman" class="">' is in effect, where
</font><font size="2" face="Palatino-Italic" class=""><i class="">first-data-pool
</i></font><font size="2" face="Palatino-Roman" class="">is the firstmost non-system pool that is available for file</font><br class="">
<font size="2" face="Palatino-Roman" class="">data storage, if such a non-system pool is available. (“Firstmost” is the first according to an internal index</font><br class="">
<font size="2" face="Palatino-Roman" class="">of all pools.) However, if there are no policy rules installed and there is no non-system pool, the system</font><br class="">
<font size="2" face="Palatino-Roman" class="">acts as if </font><font size="2" face="Palatino-Bold" class=""><b class="">SET POOL 'system'
</b></font><font size="2" face="Palatino-Roman" class="">is in effect.</font><br class="">
<font size="2" face="Palatino-Roman" class="">This change applies only to file systems that were created at or upgraded to 4.1.1. Until a file system is</font><br class="">
<font size="2" face="Palatino-Roman" class="">upgraded, if no </font><font size="2" face="Palatino-Bold" class=""><b class="">SET POOL
</b></font><font size="2" face="Palatino-Roman" class="">rules are present (set by
</font><font size="2" face="Palatino-Bold" class=""><b class="">mmchpolicy</b></font><font size="2" face="Palatino-Roman" class="">) for the file system, all data will be</font><br class="">
<font size="2" face="Palatino-Roman" class="">stored in the </font><font size="2" face="Palatino-Bold" class=""><b class="">'system'
</b></font><font size="2" face="Palatino-Roman" class="">pool.</font><br class="">
<font size="2" face="Palatino-Roman" class="">For information on GPFS policies, see the
</font><font size="2" face="Palatino-Italic" class=""><i class="">IBM Spectrum Scale: Advanced Administration Guide</i></font><font size="2" face="Palatino-Roman" class="">.</font><br class="">
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<div class="">—</div>
<div class="">Kevin Buterbaugh - Senior System Administrator</div>
<div class="">Vanderbilt University - Advanced Computing Center for Research and Education</div>
<div class=""><a href="mailto:Kevin.Buterbaugh@vanderbilt.edu" class="">Kevin.Buterbaugh@vanderbilt.edu</a> - (615)875-9633</div>
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