Change NFS Daemon systemd priority

 vim /usr/lib/systemd/system/nfs-server.service

 

 Add to [service]

IOSchedulingPriority=1
CPUSchedulingPolicy=fifo
CPUSchedulingPriority=20

 systemctl daemon-reload

 systemctl restart nfs-server

Check glibcxx version

 strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX

GLIBCXX_3.4

GLIBCXX_3.4.1

GLIBCXX_3.4.2

GLIBCXX_3.4.3

GLIBCXX_3.4.4

GLIBCXX_3.4.5

GLIBCXX_3.4.6

GLIBCXX_3.4.7

GLIBCXX_3.4.8

GLIBCXX_3.4.9

GLIBCXX_3.4.10

GLIBCXX_3.4.11

GLIBCXX_3.4.12

GLIBCXX_3.4.13

GLIBCXX_3.4.14

GLIBCXX_3.4.15

GLIBCXX_3.4.16

GLIBCXX_3.4.17

GLIBCXX_3.4.18

GLIBCXX_3.4.19