Default NFS caching does not really do write buffering, and neither does enabling cachefilesd...

test_writebuffernfs.sh

#!/bin/sh
date +%Y%m%d_%H%M%S.%N; 
echo "";
timeout 1 cat /dev/zero;
echo "";
date +%Y%m%d_%H%M%S.%N;

> ./test_writebuffernfs.sh > ./file5
> ls -l file5
-rw-r--r-- 1 belgianwit users 390463542 May  4 03:21 file5
> head -n1 file5 && tail -n1 file5
20230504_032142.529695697
20230504_032144.473636267

> ./test_writebuffernfs.sh > /workspace/users/Justin/file5
> cd /workspace/users/Justin
> ls -l file5
-rw-r--r-- 1 belgianwit users 488153115 May  4 02:25 /workspace/users/Justin/file5
> head -n1 file5 && tail -n1 file5
20230504_032214.655608732
20230504_032256.602963332

Bro... https://www.xmodulo.com/how-to-enable-local-file-caching-for-nfs-share-on-linux.html

sudo apt install cachefilesd
sudo vim /etc/default/cachefilesd  # uncomment RUN=YES
sudo vim /etc/fstab
# {{filesystem}} {{mount_point}} nfs user,rw,hard,intr,fsc 0 0
sudo mount -a
sudo systemctl restart cachefilesd