How to increase the number of threads created by the NFS daemon in RHEL 4, 5, 6 and 7?

https://access.redhat.com/solutions/2216

 SOLUTION 已验证 - 已更新 2019年一月8日05:54 - 

English 

环境

• Red Hat Enterprise Linux 4
• Red Hat Enterprise Linux 5
• Red Hat Enterprise Linux 6
• Red Hat Enterprise Linux 7 (deprecated)
• NFS

问题

• In case of a NFS server with a high load, it may be advisable to increase the number of the threads created during the nfsd server start up.
• How to increase the threads created by nfs daemon in Red Hat Enterprise Linux?
• RPCNFSDCOUNT
• nfs thread count / nfsd thread count

决议

Edit the following line in /etc/sysconfig/nfs

Raw

RPCNFSDCOUNT=8

RPCNFSDCOUNT is the number of threads that will be started. Increase this to start more threads.

Note: this method is deprecated in RHEL 7. The preferred method is to set 'threads' in /etc/nfs.conf. RHEL 8 will not support /etc/sysconfig/nfs.

/etc/sysconfig/nfs: RHEL 7 (deprecated)
/etc/nfs.conf: RHEL 7, RHEL 8

诊断步骤

To check if there are enough threads started, execute the following command:

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cat /proc/net/rpc/nfsd

Review the following line:

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th 16 0 2.610 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000

The first number is the total number of NFS server threads started. The second number indicates whether at any time all of the threads were running at once. The remaining numbers are a thread count time histogram.

You may use a script similar to the following to monitor thread usage over time:

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while :
do
    date
    grep "^th" /proc/net/rpc/nfsd
    sleep 300
done

• NOTE: This has changed in RHEL 6: Why does value for busy threads in 'th'(thread) line remains zero in /proc/net/rpc/nfsd?