UNIX for Advanced & Expert Users

Hello,

I am trying to use a storage service for backing large amounts
(terabytes) of data. The service uses Linux machines and allows
mounting of their disks using the CIFS/SMB protocol.

I do have the option of using rsync directly over the network
without mounting. But in order to automate this process, I do
want to have the remote disk mounted and be able to use cp or
rsync transparently.

The data that needs to be backed up is also on Linux systems. I had
our sys admin set things up on our system so that I can use mount.cifs
command to mount the remote disk like so:

$ mkdir -p /tmp/sam_test3
$ mount.cifs //brick.orgname.org/test3 /tmp/sam_test3 -o
user=test3, uid=sam, gid=swdevelopers, file_mode=0775,
dir_mode=0775

where the remote username (on brick) is 'test3' and my local username
is on our system is 'sam'. By the way, 'test3' is also a member of a
group with the same name 'test3'. That group has w/x permissions on
/tmp/sam_test3.

The mounting command above works fine: After entering my remote user
password, the disk is successfully mounted, but it changes owner and
gid to 'test3'.

The problem is to write to that mounted dir from my local machine on
which I'm logged in as 'sam'. Since I'm not the owner of
/tmp/sam_test3 and I don't belong to the group 'test3', I can't
write to it.

It would seem that the way to solve this would be to add my local
username, 'sam' to the group 'test3' on the remote machine. But this
is what the admin for the remote machine brick told me.

> I think that is going to be UID based, and not name based so adding
> the name will likely not help as the UID between machines is going to
> be different.

Is there anyone with in-depth knowledge of CIFS and the mount.cifs
command who can suggest a way around the ownership permissions
problems.

He also suggested that smbmount doesn't have the same problem.
(If that's true, why not?)

Thank you in advance to whomever can give me some suggestions,

Sam