Casper node memory reallocation expected to improve file system performance

March 1, 2019

A reallocation of 7 GB of memory from each Casper cluster node to the General Parallel File System (GPFS) pagepool is expected to improve overall file system performance significantly while having negligible impact on users’ jobs. The change will be made March 5 during the previously announced scheduled maintenance window.

The GPFS pagepool is used to cache user file data and file system metadata. The amount of usable memory on Casper’s smallest-memory nodes will be reduced from approximately 375 GB to 368 GB and on the large-memory nodes from 1,117 GB to 1,110 GB.