HP CIFS Server 3.0d Administrator's Guide version A.02.02 (Edition 5)

Installing and Configuring the HP CIFS Server
Other Samba Configuration Issues
Chapter 2 41
• Avoid using HP CIFS Server to share Veritas CFS directories
simultaneously on multiple nodes.
Since Veritas CFS provides for multiple nodes of a cluster to read
and write the same files concurrently, you should use extra caution
when configuring HP CIFS Server on multiple nodes of clustered
systems. Simultaneous file access can lead to data corruption if
multiple producers overwrite each others work.
• The smb.conf parameter strict locking may be set to yes to
prevent data corruption but it may also lead to decrease
performance.
By default, since HP CIFS Server provides access to files from
multiple clients (and from multiple nodes sharing a Veritas CFS),
there is the possibility of concurrent file access and hence at least a
remote chance of data corruption. Therefore, HP CIFS Server
provides a "strict locking" mechanism that can be enabled to prevent
concurrent file access. When strict locking is set to yes in
smb.conf, the server checks every read and write access for file
locks, and denies access if locks exist. Since this check will be slow on
some systems and well behaved clients do ask for lock checks when it
is important, HP recommends that you set strict locking to no in
smb.conf for most environments. The default value for strict
locking is no.
NetBIOS Names Are Not Supported on Port 445
HP CIFS Server A.02.* versions (based and Samba 3.0.x) can accept
connections on port 445 as well as the original port 139. However, since
port 445 connections are for SMB over TCP and do not support the
NetBIOS protocol. NetBIOS names are not supported on port 445. This
means features of Samba that depend on NetBIOS will not work. For
example, the "virtual server" technique depending on an "include =
/etc/opt/samba/smb.conf.%L” which ends up referring to another
smb.conf.<netbios name> will not work.
You can use the smb.conf parameter smb ports to specify which ports
the server should listen on for SMB traffic. Set smb ports to 139 to
disable port 445. By default, smb ports is set to 445 139.