I may be off somewhat, but my recollection is that support for metadata-blocksize != (other)blocksize came after POOLs. And the doc for mmcrfs seems to indicate that if you want to specify a metadata-blocksize != blocksize, then system pool must be comprised of all metadataonly disks. Which is consistent with my understanding that all the disks in a given pool have equal blocksize. So my point was, if you want to segregate data from metadata, think only about pools first. Then worry about blocksizes and metadataonly disks. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20151210/bc89a6b8/attachment.html>