Rancher NFS Caching

fbiaustria · September 26, 2017, 3:52pm

Hi,
I started using Rancher a while back and I am very much a fan of Rancher, hopeing to see it in production at my workplace soon.

As I am benchmarking Rancher NFS right now, I saw that a Rancher NFS Volume is faster than attaching the volume directly to the host. I am using fio to benchmark with following .fio template: https://gist.githubusercontent.com/fbiaustria/d8eba08191b790524ed375d291c80b40/raw/09acd4d4dfef92cec7cdae3d3fe8cffed551cb1b/randread.fio

As there seems to be a NFS Cache (I think on the client side in the Docker container), does anybody know how to disable it for benchmarking?

cjellick · September 26, 2017, 4:18pm

I don’t anything about NFS caching, but this script is the entirety of Rancher’s interactions with NFS. Maybe it’ll help you

github.com

rancher/storage/blob/master/package/nfs/rancher-nfs

#!/bin/bash

if [ -e "$(dirname $0)/common.sh" ]; then
    source $(dirname $0)/common.sh
elif [ -e "$(dirname $0)/../common/common.sh" ]; then
    source $(dirname $0)/../common/common.sh
fi

mount_nfs() {
    local host=$1
    local exportDir=$2
    local mountDir=$3
    local opts=$4
    local error

    if [ "$(ismounted $mountDir)" == 0 ]; then
        mkdir -p $mountDir

        local cmd="mount"
        if [ ! -z "$opts" ]; then

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Rancher NFS Caching

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