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How can I make NFS work better/faster in OnApp?
NFS should be mounted using version 3 in OnApp.
Other things to tune include rsize and wsize parameters, async writes, and number of NFS threads on the NFS server. The following links will help to determine which values to use in your set-up:
There isn't a significant advantage to using NFSv4. https://www.linux.com/news/benchmarking-nfsv3-vs-nfsv4-file-operation-performance
Incremental Backups will be very slow if the storage destination is mounted via NFS. Small file performance suffers in network file sharing protocols due to time wasted in latency: https://serverfault.com/questions/31628/slow-nfs-transfer-performance-of-small-files