CHAOS: Linux from Livermore
Diskless Node Support
Starting with CHAOS 3.2 (spring, 2007), this operating system supports compute clusters (such as Atlas, Zeus, Rhea, Hopi, and Yana) whose nodes have no local hard disks. The file systems that normally reside on each local disk are served instead from NFS-mounted remote disks.
Enabling diskless clusters has both advantages and disadvantages for users.
slurmd[host]: taskn: [name] terminated by OOOM killer slurmd[host]: task0: VmSize: xxxM RSS: yyyMwhere
(2) Temporary file systems use RAM, not disk. This means that any files in /tmp or /var/tmp use real memory on the node, rather than disk space. If you delete files from these temporary file systems, CHAOS reclaims the memory used. Also, CHAOS purges these file systems completely between jobs on diskless nodes. To preserve files between jobs, therefore, you must use HPSS archival storage, the Lustre parallel file system, or one of the /nfs/tmpn file systems.
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