[Samba] Slow write performance CIFS mount

[Jeremy Allison]

On Fri, Jun 15, 2018 at 08:22:41PM +0200, Trenta sis via samba wrote:
> Hi,
> 
> I have detected a very low performance with cp command or any write
> with CIFS mount (Netapp Storage), <15mb/s. Read performance is similar
> 
> Local disk perofrmance is  correct >100mb/s
> 
> fstab entry is :
> //netapp/resource$/folder  /mnt/test cifs
> username=u,password=p,domain=dom,iocharset=utf8,uid=1001,gid=1000,dir_mode=0700,file_mode=0700,auto
> 
> Server is SLES 12 SP3 with latest updates and samba
> samba-client-32bit-4.6.13+git.72.2a684235f41-3.21.3.x86_64
> cifs-utils-6.5-9.3.2.x86_64
> 
> Any suggestion?

If you're running against NetApp storage, the Samba server
is irrelevent (not being used). Have you tried using
smbclient to test read/write performance to the NetApp ?
If that is also slow then you have 2 different clients
with the same problem. Time to look closely at the server...