Nfs troubleshooting

Below are few commands which are frequently used to troubleshoot NFS or io troubleshooting

check port 2049 and 111

 # nmap -p 2049 <nfs_server_ip> -Pn

 # nc -vz <nfs_server_ip> 2049

 # nfsiostat /techbluff

 # nfsstat -m

To get nfsstats of directory and cache every 10 seconds

 # nfsiostat 10 -d

 # nfsiostat 10 -a

Allow NFS to clearcache and to learn new information

 # cat /sys/module/nfs/parameter/nfs4_disable_idmapping
 
 # nfsidmap -c

To analyse using iotop

 # iotop -t -P > /home/techbluff/iotraffic.txt

 # grep 'M/s' /home/techbluff/iotraffic.txt

check block device and its mountpoint or LV

 # lsblk -f

 # lsblk -o NAME,KNAME,MAJ:MIN,FSTYPE,MOUNTPOINT

 # iostat -ph 1 5

To analyze network TCP parameter

 # netstat -sp tcp

To analyse network interface traffic continuously

 # netstat -ic

Write test on NFS mount to check throughput

 # for i in 2 do; date; dd if=/dev/zero of=/techbluff/tput$i bs=1M count=1024; date; done

 # ls -ltrh

The topic on Linux - Nfs troubleshooting is posted by - Roger

Hope you have enjoyed, Linux - Nfs troubleshootingThanks for your time

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