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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20190321/44e55f3f/attachment.html>