[gpfsug-discuss] Combined system (metadata) and data pool on GPFS 5.x?

Ryan Novosielski novosirj at rutgers.edu
Thu Jul 4 04:55:56 BST 2019


Hi there,

Was at the Lenovo GNR/GPFS 5.x seminar the other week and we briefly discussed whether or not the recommendation was to place data in the system pool (eg. have one combined system/data pool), or to have them separate. We’ve got a GSS26 that we are creating new filesystems on for high speed scratch (16 MB blocks).

I unfortunately did not note all of the considerations/caveats related to this choice. Does anyone who knows/was there and can remember remind me?

The recollection I have is that you may have some contention for I/O if your metadata is on your data disks, and you won’t be able to have different redundancy settings. Once upon a time, block size also mattered, but not so much on 5.x.

Thanks!

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