samba - Jul 2011 - MDB Files

Hi.
I have a problem with Ms Access *.MDB files.
When I tried to edit forms it takes at least 60 seconds  to edit that forms
also to edit query. Application is working fine. But editing ... horrible.
I added these lines in my smb.conf file but nothing
     oplocks = no
    level2 oplocks = no
    strict locking = no
    fake oplocks = no
    veto oplock files
/*.MDB/*.mdb/*.LDB/*.ldb/*.DOC/*.doc/*.XLS/*.xls/*.DOCX/*.docx/*.XLSX/*.xlsx


many tables are linked to another databases located on the network. There is
no problem to edit file locally.
samba version :3x 3.5.4.
os rhel5.7
Thank you.

> I have a problem with Ms Access *.MDB files.
>
Are you using Access 2007? Of course you are aware that Access 2007 
files have the ".accdb" extension?

We have a RAID set up as our main fileserver (running samba 3.0.33 on linux,
CentOS 5). The main disk area is an XFS partition of about 8TB. I'm using
iostat to monitor disk I/O since we've gotten complaints about speed and
I'm noticing that when I write something to the samba share, the write speed
is horrible. For a 15GB file it is reporting to finish in about 20 minutes.

iostat reports very little write I/O...on the level of maybe 7 write i/o's
every 5 seconds or so.

If I were to read .5GB of data off of the samba share, it transfers quickly (and
I see 300 reads/s through iostat)...which would be about normal.

Any idea of why I'm getting such lousy write speed? 

If generate some data to write on the fileserver itself (not going through
samba) I can get some decent numbers.

With the command:   dd if=/dev/zero of=/data/testfile bs=1024k count=10000

I saw the 10GB write with a speed of 270MB/s, which is decent, so I'm not
thinking there's anything wrong with the disk or raid controller.