ONTAP Discussions

nfs kernel threads ONTAP

uadmin

Hi,

 

Is there a way to find out the maximum number of threads that nfsd supports in ONTAP? 

I have seen that for example AIX has 3891 kernel threads. How can I find out in ONTAP, or is this a

silly question?

 

Thanks,

uadmin

1 ACCEPTED SOLUTION

Ontapforrum

I am not an NFS expert, but I think kernel threads are different from the nfsd (which is a userspace process which in turn hands over requests to kernel). In any case, I believe the nfsd threads you referred may be more relevant in the general purpose operating system, where you tend to map a thread with number of CPU cores. However, ONTAP (CSMP) is a optimized storage operating system, all the processes runs as per their domain distribution in a highly optimized and parallel manner. I would suggest reading the following TR, it covers lot of useful information related to performance tuning for NFS specifically.


Have a look here:
Page 96/97:Nconnect
Page 120:Exec context throttling
Page 122:Network connection concurrency and TCP slots

https://www.netapp.com/media/10720-tr-4067.pdf

 

Quoting from the pdf: The purpose of nconnect is to provide multiple transport connections per TCP connection or mount point on a client. This helps increase parallelism and performance for NFS mounts.


CSMP:
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/CPU_as_a_compute_resource

 

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1 REPLY 1

Ontapforrum

I am not an NFS expert, but I think kernel threads are different from the nfsd (which is a userspace process which in turn hands over requests to kernel). In any case, I believe the nfsd threads you referred may be more relevant in the general purpose operating system, where you tend to map a thread with number of CPU cores. However, ONTAP (CSMP) is a optimized storage operating system, all the processes runs as per their domain distribution in a highly optimized and parallel manner. I would suggest reading the following TR, it covers lot of useful information related to performance tuning for NFS specifically.


Have a look here:
Page 96/97:Nconnect
Page 120:Exec context throttling
Page 122:Network connection concurrency and TCP slots

https://www.netapp.com/media/10720-tr-4067.pdf

 

Quoting from the pdf: The purpose of nconnect is to provide multiple transport connections per TCP connection or mount point on a client. This helps increase parallelism and performance for NFS mounts.


CSMP:
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/CPU_as_a_compute_resource

 

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