[gpfsug-discuss] Spectrum Scale Ganesha NFS multi threaded AFM?

[Andi Christiansen]

Hi,

Thanks for answering!

Yes possible, I’m not too much into NFS and AFM so I might have used the wrong term..

I looked at what you suggested (very interesting reading) and setup multiple cache gateways to our home nfs server with the new afmParallelMount feature. It was as I suspected, for each gateway that does a write it gets 50-60MB/s bandwidth so although this utilizes more when adding it up (4 x gateways = 4 x 50-60MB/s) I’m still confused to why one server with one link cannot utilize more than the 50-60MB/s on 10Gb links ? Even 200-240MB/s is much slower than a regular 10Gbit interface.

Best Regards 
Andi Christiansen



Sendt fra min iPhone

> Den 21. feb. 2020 kl. 18.25 skrev Tomer Perry <TOMP at il.ibm.com>:
> 
> Hi,
> 
> I believe the right term is not multithreaded, but rather multistream. NFS will submit multiple requests in parallel, but without using large enough window you won't be able to get much of each stream.
> So, the first place to look is here: https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.4/com.ibm.spectrum.scale.v5r04.doc/bl1adm_tuningbothnfsclientnfsserver.htm - and while its talking about "Kernel NFS" the same apply to any TCP socket based communication ( including Ganesha). I tend to test the performance using iperf/nsdperf ( just make sure to use single stream) in order to see what is the expected maximum performance.
> After that, you can start looking into "how can I get multiple streams?" - for that there are two options:
> https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.4/com.ibm.spectrum.scale.v5r04.doc/bl1ins_paralleldatatransfersafm.htm
> and
> https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.4/com.ibm.spectrum.scale.v5r04.doc/b1lins_afmparalleldatatransferwithremotemounts.htm
> 
> The former enhance large file transfer, while the latter ( new in 5.0.4) will help with multiple small files as well.
> 
> 
> 
> Regards,
> 
> Tomer Perry
> Scalable I/O Development (Spectrum Scale)
> email: tomp at il.ibm.com
> 1 Azrieli Center, Tel Aviv 67021, Israel
> Global Tel:    +1 720 3422758
> Israel Tel:      +972 3 9188625
> Mobile:         +972 52 2554625
> 
> 
> 
> 
> From:        Andi Christiansen <andi at christiansen.xxx>
> To:        "gpfsug-discuss at spectrumscale.org" <gpfsug-discuss at spectrumscale.org>
> Date:        21/02/2020 15:25
> Subject:        [EXTERNAL] [gpfsug-discuss] Spectrum Scale Ganesha NFS multi threaded AFM?
> Sent by:        gpfsug-discuss-bounces at spectrumscale.org
> 
> 
> 
> Hi all, 
> 
> i have searched the internet for a good time now with no answer to this.. So i hope someone can tell me if this is possible or not. 
> 
> We use NFS from our Cluster1 to a AFM enabled fileset on Cluster2. That is working as intended. But when AFM transfers files from one site to another it caps out at about 5-700Mbit/s which isnt impressive.. The sites are connected on 10Gbit links but the distance/round-trip is too far/high to use the NSD protocol with AFM. 
> 
> On the cluster where the fileset is exported we can only see 1 session against the client cluster, is there a way to either tune Ganesha or AFM to use more threads/sessions? 
> 
> We have about 7.7Gbit bandwidth between the sites from the 10Gbit links and with multiple NFS sessions we can reach the maximum bandwidth(each using about 50-60MBits per session). 
> 
> Best Regards 
> Andi Christiansen _______________________________________________
> gpfsug-discuss mailing list
> gpfsug-discuss at spectrumscale.org
> http://gpfsug.org/mailman/listinfo/gpfsug-discuss
> 
> 
> 
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