[Samba] Samba share for HPC environment.

[Daniel Lopes de Carvalho]

Hi Rowland,

EXAMPLE and UNISIM is a sanitisation error, I'm sorry.

Yes, my users and groups have their attributes defined and they are in the
range 1000-90000000.

Thanks for your answer. I'll continue investigating the problem.

Thanks a lot.

On Mon, May 24, 2021 at 9:29 AM Rowland penny via samba <
samba at lists.samba.org> wrote:

> On 24/05/2021 13:05, Daniel Lopes de Carvalho via samba wrote:
> > Hey guys,
> >
> > I would like to ask for help with a Samba share in an HPC environment.
> >
> > We have a pretty new HPC cluster that is running a proprietary software
> > that opens multiple Samba network connections. And these connections
> > perform intense reading and writing files.
> >
> > At a given moment, I don't know if Samba or Windows has a network
> > unavailability error.
> >
> > I would like to know if there is any configuration or tunning that can be
> > done in Samba to support these connections and these reading and writing
> > operations.
> >
> > In the Samba log, there are no error messages.
> >
> > Regarding the hardware, they are new machines, with less than 1 years of
> > manufacture and the storage of this HPC is a dedicated server. Specs:
> >
> > HPE ProLiant DL380 Gen10
> > 2x Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz (total 64 cores)
> > 192GB RAM
> > Centos 8.1
> > ulimit = unlimited
> > file system = XFS
> >
> > smb.conf:
> > [global]
> >     security = ads
> >     workgroup = EXAMPLE
> >     realm = EXAMPLE.COM
> >
> >     idmap config * : backend = tdb
> >     idmap config * : range = 90000001-100000000
> >
> >     idmap config UNISIM : default = yes
> >     idmap config UNISIM : backend = ad
> >     idmap config UNISIM : schema_mode = rfc2307
> >     idmap config UNISIM : range = 1000-90000000
> >     idmap config UNISIM : unix_nss_info = yes
> >
> >     template homedir = /home/%U
> >     template shell = /bin/bash
> >
> >     winbind use default domain = true
> >     winbind refresh tickets = Yes
> >
> >     dedicated keytab file = /etc/krb5.keytab
> >     kerberos method = secrets and keytab
> >
> >     vfs objects = acl_xattr
> >     map acl inherit = Yes
> >     store dos attributes = Yes
> >
> >     log level = 4
> >     log file = /var/log/samba/log.%m
> >     syslog = 0
> >     syslog only = No
> >
> > [scratch]
> >     comment = Scratch area
> >     browseable = yes
> >     writeable = yes
> >     path = /scratch
> >     create mode = 0755
> >     public = yes
> >     read only = no
> >     oplocks = no
> >     level2 oplocks = no
> >
> > Could someone help or give me any advice.
> >
> > Thanks
>
>
> There doesn't seem to be much wrong with the smb.conf, except the
> workgroup is 'EXAMPLE' and the 'idmap config' lines use 'UNISIM', they
> should match, so if it isn't a sanitisation error, you need to fix this.
> You are using the 'ad' winbind backend, so do your users have a
> uidNumber attribute and does 'Domain Users' have a gidNumber attribute ?
> If they do have the required attributes, are they inside the
> '1000-90000000' range ?
>
> Finally, 'public = yes' will not work, because you do not have 'map to
> guest = yes' in 'global'
>
> Rowland
>
>
>
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-- 
Daniel Lopes de Carvalho
daniel at cepetro.unicamp.br
unisim.cepetro.unicamp.br <https://www.unisim.cepetro.unicamp.br/>
+55 19 3521-1221