[gpfsug-discuss] Clarification about blocksize in stardanrd gpfs and GNR

Dorigo Alvise (PSI) alvise.dorigo at psi.ch
Thu Mar 21 13:22:45 GMT 2019


Hi,
I'm a little bit puzzled about different meanings of blocksize for different GPFS installation (standard and gnr).

>From this page https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20(GPFS)/page/File%20System%20Planning

I read:

  *   The blocksize is the largest size IO that GPFS can issue to the underlying device
  *   A subblock is 1/32nd of blocksize. This is the smallest allocation to a single file

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.

Can someone explain what is the "device" in the case of GNR ? a single pdisk ?

Thanks,

  Alvise

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