System-Call Based Problem Diagnosis for PVFS

We present a syscall-based approach to automatically di- agnose performance problems, server-to-client propagated errors, and crash/hang problems in PVFS. Our approach compares the statistical and semantic attributes of syscalls across PVFS servers in order to diagnose the culprit server, under these problems, for different file-system benchmarks- dd, postmark and IOzone-in a PVFS cluster.