NFS random read

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In Figure 1 a random-read FIO workload is running against a file system using NFS-connected shares. The workload is scaled from 1 to 128 jobs running on the KVM guest. The storage space is provided from the protocol server contributing an additional 64 GiB of page cache.

Figure 1. NFS random read
NFS random read

NFS throughput measurement peaks at 16 jobs, similar to iSCSI. KVM host CPU load also peaks at 32 jobs. Similar throughput fall-off is visible starting at 64 jobs.