HP CIFS Server Administrator's Guide Version A.03.01.02 (5900-1766, September 2011)

12 HP-UX Configuration for HP CIFS
This chapter describes HP-UX tuning procedures for the HP CIFS Server. It contains the following
sections:
• HP CIFS Process Model
• TDB Memory Map for HP CIFS Server
• Overview of Kernel Configuration Parameters
• Configuring Kernel Parameters for HP CIFS
The following information should be considered as general guidelines and not a rigid formula to
determine the resource requirements of a HP CIFS server running on HP-UX 11i v3. Each customer
configuration is unique and on-line tools should be used while the system is running its normal load
to ascertain the requirements of each system.
HP CIFS Process Model
The SMB daemon process, smbd, handles all SMB requests from a client. One such process is
launched for each connected client. Each SMBD process handles one and only one client. Therefore,
if there are 2048 connected clients, there will be 2048 SMBD processes. Such a large number of
processes will demand system resources, requiring adjustment of certain kernel configuration
parameters. It will also deplete memory, disc and swap space resources.
TDB Memory-Mapped Access for HP CIFS Server
Fixed Size Memory Map Support on HP-UX 11i v2 PA and 11i v3 PA Systems
HP CIFS Server A.02.03 on HP-UX 11i v2 PA and 11i v3 PA systems and HP CIFS Server
A.03.01.02 on HP-UX 11i v3 PA systems support the fixed size memory map for memory-mapped
access of the locking.tdb file. HP CIFS Server can access the Trivial DataBase (TDB) files using
memory-mapped access with a pre-determined size that is sufficient to accommodate the growth
of TDB files, so that the risk of data corruption due to expanding and remapping the memory-mapped
files can be avoided. To provide balance between performance and address space utilization, the
fixed size memory map feature is supported only on locking.tdb.
The smb.conf use mmap parameter controls whether or not the memory map feature is enabled.
The fixed mmap size parameter is used to configure the fixed memory size if the memory map
feature is enabled. See the “Configuration Parameters” section for details.
Configuration Parameters
The following is a list of the new global parameters in smb.conf:
• access based share enum (S)
This parameter enables the users to view the share hosted by the service during a share
enumeration. If the value of the access based share enum (S) parameter is set toYes
for a service, then the share hosted is viewable to users with read and write access. The default
setting for this parameter is access based share enum = no.
HP CIFS Process Model 151