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BeeGFS Tier0 Unavailable - OS User Open File Limit Exceeded During Large Data Copy

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Applies to

  • BeeGFS parallel file system
  • Linux operating systems (all distributions)
  • Workloads using mpiutilcopy or similar high-file-count operations

Issue

When running a large data copy operation (e.g., mpiutilcopy) to BeeGFS Tier0, the process fails and the filesystem becomes unavailable for writes.
The following symptoms and log outputs were observed:
  • Application error: “Too many open files”
  • The file copy halts or fails
  • Users are unable to copy files until open file handles drop below a threshold
Reviewing the file open limits for the user shows:
$ ulimit -n
1024
$ ulimit -Sn
1024
$ ulimit -Hn
524288
The user soft open file limit (ulimit -Sn) is set to 1024.
The hard limit (ulimit -Hn) is much higher (524288).

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