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We have just discovered that a large buffer cache generated from traversing a lustre file system will cause a significant system overhead for applications with high memory demands. We have seen a 50% slowdown or worse for applications. Even High Performance Linpack, that have no file IO whatsoever is affected. The only remedy seems to be to empty the buffer cache from memory by running

...entually we see a kswap process. I would like to control swapping so these files don't go into memory instead they get flushed out. These computers are used for fluid dynamics calculations and I would just like to have the memory do a FIFO and use the least swap as possible. I tried setting the swapiness to '10' or '0' but that really does not help. Also, has there been a major memory management advancement from 4.6 to 5.2? If so, where can I read about the changes? TIA

I have a 2 node cluster of HP DL380G4s. These machines are attached via scsi to an external HP disk enclosure. They run 32bit RH AS 4.0 and OCFS 1.2.4, the latest release. They were upgraded from 1.2.3 only a few days after 1.2.4 was released. I had reported on the mailing list that my developers were happy, and things seemed faster. However, twice in that time, the cluster has gone down due