topic Re: A900 performance in AFF

A900 performance

Jackiez — Wed, 04 Jun 2025 09:48:11 GMT

Hi, ONTAP experts,

We have a A900 performance case. We use fusion to get 33GB/s + performance data(32KB block, 100% sequential read). But at customer site, we test the performance , only get 23GB/s(32KB block, 100% sequential read, 2 Aggr per controller, total 4 Aggr, 16 volumes) ,latency 5ms. we use 9 client (100Gb NIC per client) to connect one 100Gb switch , then connect 8 ports to A900 , ONTAP version is 9.12.1P3.

Would you share some experience on how to optimize A900 performance (especially Bandwidth) ?

(BTW , when we use 1MB block, get 30GB/s , but just keeps a few seconds, not consistent)

Re: A900 performance

TMACMD — Sun, 11 Jun 2023 20:22:09 GMT

You are lacking so much information for the community to be helpful....

What is/are the client(s)? how are they connected? NFS/CIFS? v3/v4/v4.1/v4.2? SMB2/SMB3?

Operating systems? mount parameters...

I mean...give us something

Re: A900 performance

Jackiez — Mon, 12 Jun 2023 00:49:27 GMT

Hi, TMACMD,

Thank you ! Here is more details information : client ,ubuntu 18.04, nfs3.0; mount parameters :

mount -t nfs -o vers=3,nolock,proto=tcp,rsize=1048576,wsize=1048576,hard,10.199.199.105:/vol1 /netapp01

Re: A900 performance

TMACMD — Mon, 12 Jun 2023 01:24:05 GMT

If you haven’t done so, you should really take a hard look at https://www.netapp.com/media/10720-tr-4067.pdf

there are many details in this doc that should assist with improving performance.

second, you are using a large read/wire size. If I recall, ONTAP defaults to 64k and you are teeing to use 1M. You will need to modify the nfs svm then remount the clients

Re: A900 performance

Jackiez — Thu, 15 Jun 2023 14:30:21 GMT

Hi, TMACMD,

Thanks for your advice !

We set some parameters , tcp slot table =128, nfs tcp -max-xfer-size=1M , then we got much better performance data: 32K block, 28-30GBps; 1MB block, 34-36GBps. Match the sizing performance data.