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...re is our setup: All IO servers are Dell PowerEdge 2950s. 2 8-core sockets with X5355 @ 2.66GHz and 16Gb of RAM. The data is on DDN S2A 9550s with 8+2 RAID configuration connected directly with 4Gb Fibre channel. They are running RHEL 4.5, Lustre 6.7.2-ddn3, kernel 2.6.18-128.7.1.el5.ddn1.l1.6.7.2.ddn3smp As a side note the users code is Parflow, developed at LLNL. The files are SILO files. We have as many as 1.4 million files in a single directory and we now have half a billion files that we need to deal with in one way or another. The code has already been modified to split the files on newer run...