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Oracle Linux: Slow NFS Transfer

in Linux

Applies To:

Oracle Cloud Infrastructure - Version N/A and later

Linux OS - Version Oracle Linux 6.0 and later

Symptoms:

Slow NFS read and write access.

Kernel ring buffer shows:

[5047243.604682] RPC: fragment too large: 369296129
[5047243.605059] RPC: fragment too large: 369295873
[5047243.605583] RPC: fragment too large: 369295617

Changes:

None

Cause:

NFS rsize and wsize values are negotiated with NFS server during mount.

If NFS server changes the windows size, those values are not renegotiated with NFS clients and might cause some network retransmissions and transfer slow down.

Solution:

NFS server calculates the read and write block size during startup. Those values are then negotiated with clients during mount operation.

Tagged:

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