[gpfsug-discuss] SMB performance issues with CES

[Leonardo Sala]

Hi Jan-Frode

interesting! Is this something I could apply to the linux clients, too, 
or is this only for windows clients?

cheers

leo

Paul Scherrer Institut
Dr. Leonardo Sala
Group Leader Data Analysis and Research Infrastructure
Group Leader Data Curation a.i.
Deputy Department Head Science IT Infrastructure and Services department
Science IT Infrastructure and Services department (AWI)
OBBA/230
Forschungstrasse 111
5232 Villigen PSI
Switzerland

Phone: +41 56 310 3369
leonardo.sala at psi.ch
www.psi.ch

On 6/1/26 15:24, Jan-Frode Myklebust wrote:
> Not too long ago there were some reports about SMB signing being very
> costly. Signing would give approximately 500 MB/s, while encryption
> would give closer to 1200 MB/s. Signing is controlled by Security
> Settings -> Local Policies -> Security options "Microsoft network
> client: Digitally Sign Communications (always)".
>
>
>    -jf
>
> On Mon, Jun 1, 2026 at 2:24 PM Leonardo Sala via gpfsug-discuss
> <gpfsug-discuss at gpfsug.org> wrote:
>> Hallo everyone
>>
>> I have just notices some possible performance issues on SMB when using CES, at least compared to NFS. Using NFSv4 I can easily get 1 GB/s on a single client (linux), while when using a CIFS mount I get tops 500 MB/s on a single client. Using two separate servers as clients gets a 1 GB/s total throughput on the CES server, so I would say there not a strict limitation on the CES server itself. Any hints on how to improve this / debugging hints? I spent some time on IBM documentation and some user groups talks, but got no improvement...
>>
>> Thanks!
>>
>> cheers
>>
>> leo
>>
>> --
>> Paul Scherrer Institut
>> Dr. Leonardo Sala
>> Group Leader Data Analysis and Research Infrastructure
>> Group Leader Data Curation a.i.
>> Deputy Department Head Science IT Infrastructure and Services department
>> Science IT Infrastructure and Services department (AWI)
>> OBBA/230
>> Forschungstrasse 111
>> 5232 Villigen PSI
>> Switzerland
>>
>> Phone: +41 56 310 3369
>> leonardo.sala at psi.ch
>> www.psi.ch
>>
>> _______________________________________________
>> gpfsug-discuss mailing list
>> gpfsug-discuss at gpfsug.org
>> http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org
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