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Are there issues with running cflowd/cfdcollect atop NFS?

April 26, 2017atop cfdcollect cflowd NFS running

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Are there issues with running cflowd/cfdcollect atop NFS?

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Running cflowd or cfdcollect atop NFS is generally a very bad idea. NFS doesn’t support disconnected operation, so a network problem can cause you to lose data. (In the worst case, the data that is lost may be just what you need to point you to the cause of the NFS problem…). If NFS is in the picture, run cfdcollect on the NFS server and cflowd on the client. Also note that cflowd uses mmap() on the active raw flow file; doing this over NFS tends to either 1) not work, or 2) interact poorly.