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<div>Hi,</div>
<div>I'm a little bit puzzled about different meanings of blocksize for different GPFS installation (standard and gnr).</div>
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<div>From this page <a href="https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20(GPFS)/page/File%20System%20Planning" target="_blank">
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20(GPFS)/page/File%20System%20Planning</a></div>
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<div>I read:</div>
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<li><span style="font-size:12px"><span style="font-family:'arial' , 'helvetica' , sans-serif">The<span class="Apple-converted-space">
</span><b>blocksize</b><span class="Apple-converted-space"> </span>is the largest size IO that GPFS can issue to the underlying device</span></span></li><li><span style="font-size:12px"><span style="font-family:'arial' , 'helvetica' , sans-serif">A<span class="Apple-converted-space">
</span><b>subblock</b><span class="Apple-converted-space"> </span>is 1/32nd of blocksize. This is the smallest allocation to a single file</span></span></li></ul>
For non-gnr GPFS device is quite clear to me (I hope): it is a single spinning disk (or ssd). And I verified this on a small cluster composed of nsd using their local hard drive.<br>
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<div>Can someone explain what is the "device" in the case of GNR ? a single pdisk ?</div>
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<div>Thanks,</div>
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<div> Alvise<br>
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