Hello list,recently, we got the question if we use direct IO in our Scale cluster, but we are not sure if we do or not.
We have a three node cluster with shared storage available to all three nodes and running CES on all the nodes with SMB/NFS/S3 exports and no GPFS nodes attached. So the filesystem is only accessed via CES. The cluster has a AFM-DR connection to a secondary GPFS cluster on another site.
I would assume from this setup that we don't use direct IO. The nodes are connected via Ethernet to the campus network and via Infiniband between the three nodes.
How can we check, if we use direct IO? Regards Christoph
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