ID Number: Q65769
2.00
OS/2
Summary:
Because OS/2 LAN Manager and IBM Lan Server adhere to the same UAS
(user account system) standard and support the same set of APIs
(application programming interfaces), they can coexist and
interoperate together in a mixed network environment.
More Information:
There are some extensions that are not shared between both products,
but these can be viewed as towers on top of the common functionality.
Please refer to the following chart for more information on this
topic:
+---------+
Optional +---------+ |
Additional | |
Functions | |-+
+----|----+
...........................................................
Common +-----|------+ +--------------+
Core Functions | IBM LS 1.2 |<------>| OS/2 LM 2.00 |
+------------+ +-------^------+
|
Enhanced Core +---v------+
Functions +-| |
| |
| +----------+
+----------+
Interoperability is seamless between the core functions that are
common to IBM Lan Server and OS/2 LAN Manager. On top of these core
functions, the IBM Lan Server provides additional options such as the
Alias functions, which only work between systems with common towers.
In addition, OS/2 LAN Manager supports enhanced core functions such as
UPS (uninterruptable power supply). These enhanced core functions are
an extension to the common core functions and do not prevent
interoperability or require similar functionality on an IBM Lan Server
system.
COMMON CORE FUNCTIONS
=====================
Ring 3 server
DOS and OS/2 redirector
User Account System
User-level security
APIs (except NETBIOS and PROFILES)
Printing
Network command line interface for OS/2
LAN SERVER OPTIONAL FUNCTIONS
=============================
1. IBM's Concept of an SSI (Single System Image)
IBM's single system image allows one or more servers to be managed
as a single logical system. An IBM Lan Server installation can be
set up to make the shared resources on all servers in the domain
appear as a single pool of resources. The concept of aliases
assists with this (an alias is really just a "nickname" for a
shared resource).
2. Network Applications
This is a facility where an administrator can define application
profiles that can be made available to logged on users of the
domain. The definition of an application includes the ability to
make resource assignments (do NET USEs) automatically prior to
starting the program.
Network applications can be displayed on a user's program starter
(OS/2 Desktop Manager window), and on IBM's "served application
panel" on MS-DOS requesters at logon time.
3. LOGON Resource Assignments
IBM has a full-screen interface that allows an administrator to
easily define logon assignments. Logon assignments might be
applications or other resources, similar to our LOGON SCRIPTs, but
with a full-screen interface.
4. UPM (User Profile Management)
This service provides a set of user and group validation and
management functions for IBM's OS/2 EE components. UPM is available
in both a standalone and a network version. UPM is used to control
access to resources and access authorization control for the
following:
LAN Server requester
DATABASE Manager
Communication Manager
This means that once a user is logged on, the different EE
components will recognize this and do not require the user to enter
their username and password each time they start one of the EE
services.
LAN MANAGER ENHANCED CORE FUNCTIONS
===================================
1. 386 Server
The 386 Server is the high-performance, 32-bit server that takes
full advantage of the Intel 386 architecture and provides local
security.
Benefits:
- Faster network response time.
- Enables a single server to service more client workstations.
- Secure console; prevents unauthorized access to the server from
the local console.
2. Fault Tolerant Disk Operation
This feature helps to save data should a disk error occur. This is
accomplished through the following methods:
Method Description
------ -----------
Hot Fixing Detects bad sectors and reroutes data to a good
sector on the disk.
Disk Mirroring Sets up two identical partitions on two hard
disk drives using the same disk drive
controller.
Disk Duplexing This is similar to disk mirroring, except that
the hard disk drives are on separate disk drive
controllers.
Benefits:
- Assures that server data is always reliable and available.
- Minimizes system down time.
3. UPS (Uninterruptable Power Supply)
This service keeps the server running during a power failure until
the system can be safely shut down, or until the administrator
stops the server.
Benefit:
- Data integrity and orderly shutdown that will enable a shorter
restart and recovery time.
4. PEER Service
This service provides limited server capability on a client
workstation that will enable a workstation to make resources
available to the network (disk, printers, etc.).
Benefits:
- The customer does not need to pay a full server license when they
want to share for example a printer on a workstation with other
users.
- Allows an administrator to backup workstations over the network.
5. OS/2 RIPL
This service allows MS-DOS and OS/2 workstations to be booted from
the server.
Benefit:
- Allows installation of lower cost workstations (diskless), and
eases the administration of operating system upgrades and
installations (one central place, instead of doing it for each
workstation).
6. Multiple Adapter Support
This feature allows a single server to support more than one
network.
Benefit:
- Enables the administrator to split the network in case network
traffic becomes a bottleneck, and allows a single server to
support more clients.
7. BACKUP Domain Controller
This service allows the domain controller to be replicated to other
servers (like a standby system).
Benefit:
- You can avoid having a single point of failure in a network.
Operation can be switched to the backup domain controller when
the primary domain controller is down (for hardware or
maintenance reasons).
8. NDIS and JETBEUI
This is the NetBIOS driver and the network device interface
architecture supported by OS/2 LAN Manager.
Benefit:
- Allows you to interoperate with hundreds of network cards from a
variety of vendors.
INTEROPERABILITY SCENARIOS AND RULES
====================================
Rules
-----
1. IBM OS/2 EE workstations always require an EE domain controller.
2. An IBM OS/2 EE workstation has to log on to an EE domain controller.
3. Additional IBM EE LAN Server functions (in addition to the common
core functions) will only work between OS/2 LAN Server systems.
4. Enhanced core functions require an OS/2 LAN Manager system, but
the services may be accessed by an IBM Lan Server system (for
example, Peer service).
5. An OS/2 LAN Manager client can log onto either an IBM Lan Server or
an OS/2 LAN Manager domain controller.
6. An IBM Lan Server system can access all OS/2 LAN Manager resources
via the UNC (Unique Naming Convention) (no aliasing); OS/2 LAN
Manager resources must be declared external to IBM Lan Server
(outside of the IBM Lan Server's SSI name space).
Scenario
--------
+-----+ +-------+ +-----+
| disk| |Printerdisk|
+---|-+ +-|-----+ +-|---+
+---|------| +-|---------+
| IBM LS | | OS/2 LM |
|DomainCtr.|---------------| Server |
+----------+ +-----------+
| |
+----------+ TRN +-----------+
| IBM LS | A | OS/2 LM |
| Client | | Client |
+----------+ +-----------+
| |
+----------------------------+
- All systems are on the same Token-Ring network.
- The domain controller resides on the IBM EE LAN Server for both
OS/2 LAN Manager and IBM Lan Server systems.
- The printer and spooler are connected and running on OS/2 LAN
Manager, and will handle both IBM Lan Server and OS/2 LAN Manager
printing.
- All disk resources on the network can be accessed by either OS/2
LAN Manager or IBM Lan Server systems.