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- @DDDDDDDDDDDDD6VMS SYSTEM MANAGER'S MANUALGDDDDDDDDDDDDDY
- : CHAPTER 7 :
- HMMMMMMMMMMMMMMMMMMMMMMMMMMM<
-
- Setting Up a Local Area VAXcluster Environment
-
- This chapter discusses how to set up a small local area VAXcluster
- configuration. For the purposes of this manual, a small local area
- VAXcluster configuration consists of one processor called a boot server that
- serves as the hub of the cluster, and one or more MircroVAX or VAXstation
- processors that are connected to the boot node. If you want to learn how to
- set up this type of VAXcluster configuration, then you should read the rest
- of this chapter. If you manage a VAXcluster environment other than the type
- described in this chapter, then you should refer to the VMS VAXcluster
- Manual.
-
- 7.1 What Is a Cluster?
-
- A cluster is a group of two or more processors that share some or all of
- their resources. When a group of VAX processors shares resources in a
- VAXcluster environment, the storage and computing resources of all of the
- processors are combined, which can increase the processing capability,
- communications, and availability of your computer system.
-
- 7.1.1 VAXcluster Types
-
- Three types of VAXcluster configurations are possible:
-
- Local Area VAXcluster configuration
- CI-only VAXcluster configuration
- Mixed-interconnect VAXcluster configuration
-
- Local Area VAXcluster Configuration
-
- A Local Area VAXcluster configuration is made up of a single VAX processor
- that serves as the management center of the cluster, plus one or more VAX
- processors that are connected to ths hub. A local area VAXcluster
- configuration always includes the following parts:
-
- : A Boot Server
-
- A boot server is a VAX or MicroVAX processor, and it serves as the
- management center of a local area VAXcluster environment. The system disk
- of the boot server contains management files for the entire cluster,
- including startup files, the boot server's system disk, user authorization
- information, and the capability of letting other processors join the
- cluster. The boot server must be available and running for the cluster to
- operate.
-
- Boot servers should be the most powerful machines in the cluster. They
- should also use the highest bandwidth Ethernet adapters available. You can
- use any VAX or MicroVAX system except VAX-11/725, VAX-11/730 or MicroVAX I
- as a boot server.
-
- ( Note that if your boot server is a MircoVAX II class system with an RD54
- system disk, you can have a maximum of three satellite nodes in your
- VAXcluster configuration. In either of these cases, DIGITAL rtecommends
- that the satellites use local RD series disks for paging and swapping.
- Refer to the VAXcluster Software Product Description for complete
- information about supported configurations. )
-
- : Satellite Nodes
-
- A satellite node is a MicroVAX processor that is a member of the cluster. A
- processor becomes a satellite node when the CLUSTER_CONFIG.COM procedure is
- ececuted from the boot server to add the processor to the cluster.
-
- You can use any of the following as satellite nodes:
-
- : MicroVAX II or MicroVAX 2000 systems
- : VAXstation II or VAXstation 2000 systems
- : MicroVAX 3000 series systems
-
- CI-only VAXcluster Configuration
-
- A CI-only VAXcluster configuration is a cluster in qhich only the computer
- interconnect is used for communications between the processors in the
- cluster. In a CI-only VAXcluster configuration, the star coupler is used as
- the common connection point for all nodes in the cluster, including both VAX
- processors and Hierarchical Storage Controllers ( HSCs ).
-
- Nodes in a CI-only VAXcluster configuration can be either
-
- : VAX processors listed in the VAXcluster SPD, or
- : HSCs
-
- Mixed-Interconnect VAXcluster Configuration
-
- A mixed-interconnect cluster may include both CI-connectdc VAX processors
- and Micro-VAX systems.
-
- This chapter concentrates on setting up a Local Area VAXcluster
- configuration with a single boot server. Although some of the management
- tasks for other VAXcluster types are similar, you should refer to the
- VAXcluster documentation that is avaiable in the full VMS documentation set
- for information about managing a CI-only or mixed-interconnect cluster.
-
- 7.2 Shared Resources
-
- A major benefit of a VAXcluster configuration is the ability to share
- resources. A shared resource is a resource ( such as a disk or a queue )
- that can be accessed and used by any node in a cluster. Data files,
- application programs, printers, are just a ffew of the items that can be
- accessed by users on a cluster with shared resources, without regard to the
- particular node on which the files or program or printer might physically
- reside.
-
- When disks are set up as shared resources in a VAX cluster environment,
- users have the same environment ( password, privileges, access to default
- login disks, and so on ) regardless of the node that is used for logging in.
- You can realize a more effcient use of mass storage with shared disks,
- because the information on any device can be used by more than one node--the
- information does not have to be rewritten in many places.
-
- Print and batch queues can also be set up as shared resources. In a
- VAXcluster configuration with shared print and batch queues, a single jobt
- controller queue file manages the queues for all nodes on the cluster. The
- job controller file makes the queues available from any node. For example,
- suppose your VAXcluster configuration has fully shared resources and
- includes nodes ALBANY, BASEL, and CARIO. A user logged in to node ALBANY
- can send a file that physically resides on node BASEL to a printer that is
- physically connected to node CAIRO, and the user never has to specify ( or
- even know ) the nodes for either the file or the printer. For more
- information about setting up and using print and batch queus in a VAXcluster
- environment, see Chapter 5.
-
- 7.3 Preparing a System for a Local ARea VAXcluster Environment
-
- In a VAXcluster environment with a single system disk, you need to install
- the VMS operating system only once, regardless of the number of nodes in the
- cluser.
-
- To install the operating system, foollow the instructions in your
- processor's installation guide. Before beginning the installation
- procedure, you must determine the configuation type for your cluster (
- CI-only, local rea, or mixed-interconnect). During the installation of the
- operating system you will be asked a series of questions. Table 7-1 lists
- the questions and answers for Local ARea VAXcluster configurations.
-
- NOTE: While rebooting at the end of the installation procedure, the system
- displays messages warning that you must install required licenses. Be sure
- to install these licenses, as well as the DECnet-VAX license, as soon as the
- system is available. Procedures for installing the licenses are described
- in the release notes distributed with the software kit.
-
- ZDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
- ?
- 3TABLE 7-1: INSTALLATION QUESTIONS FOR LOCAL AREA VAXCLUSTER OCNFIGURATIONS
- 3
- CDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
- 4
- 3Question Response
- 3
- CDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
- 4
- 3Will this node be a cluster member (Y/N)? Enter Y
- 3
- 3
- 3
- 3What is the node's DECnet node name? Enter DECnet node name
- 3
- 3 for example, ALBANY.
- 3
- 3 The DECnet node name
- 3
- 3 may be 1-6 alphanumeric
- 3
- 3 characters in length
- 3
- 3 and may not include $
- 3
- 3 or _.
- 3
- 3
- 3
- 3What is the Node's DECnet node address? Enter DECnet node
- 3
- 3 address :-> 2.2.
- 3
- 3
- 3
- 3Will the Ethernet be used for cluster communica-
- 3
- 3tions (Y/N)? Enter Y. The Ethernet
- 3
- 3 for cluster (SCS
- 3
- 3 internode) communica-
- 3
- 3 tions in local area
- 3
- 3 configurations.
- 3
- 3
- 3
- 3Enter this cluster's group number: Enter a number in the
- 3
- 3 range from 1-4095 or
- 3
- 3 61440-54435.
- 3
- 3
- 3
- 3Enter this cluster's password: Enter the cluster pw.
- 3
- 3 1-31 alphanumeric
- 3
- 3 characters in length
- 3
- 3 and MAY include $ and _
- 3
- 3
- 3
- 3Reenter this cluster's password for verification: Reenter The password
- 3
- 3
- 3
- 3Will ALBANY be a disk server (Y/N)? Enter Y. In local
- 3
- 3 area configurations,
- 3
- 3 the system disk is
- 3
- 3 always served to the
- 3
- 3 cluster.
- 3
- 3
- 3
- 3Will ALBANY serve HSC disks (Y/N)? Enter N.
- 3
- 3
- 3
- 3Enter a value for ALBANY's ALLOCLASS parameter: Enter a value of 0 for
- 3
- 3 Local Area VAXcluster
- 3
- 3 configurations
- 3
- 3 convered by this manual
- 3
- 3
- 3
- 3Does this cluster contain a quorum disk [N]? Enter N for Local Area
- 3
- 3 VAXcluster configur-
- 3
- 3 ations covered by this
- 3
- 3 manual
- 3
- @DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
- Y
-
- 7.3.1 Building a VAXcluster Configuration
-
- Once you have installed the VMS operating system, you can start to build
- your cluster. This section describes how to build a simple Local Area
- VAXcluster configuration using the command procedure
- SYS$MANAGER:CLUSTER_CONFIG.COM. If you find that your cluster configuration
- is more than the type described in thismanual, be sure to consult the VMS
- VAXcluster Manual.
-
- The command procedure CLUSTER_CONFIG.COM is the primary tool that you use
- for adding a node to your VAXcluster configuration, removing a node from the
- cluster, or changing the characteristics of a node. This section describes
- how to use CLUSTER_CONFIG.COM to add or remove a satellite node in a Local
- Area VAXcluster configuration.
-
- 7.3.1.1 Using CLUSTER_CONFIG.COM
-
- Before using CLUSTER_CONFIG.COM, log in to the SYSTEM account on the system
- that will be your boot server and make sure that DECnet-VAX is up and
- running be sure that your default is set to SYS$MANAGER; then enter the
- following command:
-
- $ @CLUSTER_CONFIG
-
- 7.3.1.2 Setting Up the Boot Server
-
- The first step in setting up your Local Area cluster for the first time is
- to establish the boot server. You must establish the local system as a boot
- server before you can add any satellites to the cluster.
-
- To establish a node as a boot server, run CLUSTER_CONFIG.COM anad select the
- CHANGE option from the menu. Then, select the option to enable the local
- system as a boot server.
-
- 7.3.1.3 Adding Satellite Nodes
-
- To add satellites nodes to your Local Area VAXcluster configuration, you use
- the ADD option from the CLUSTER_CONFIG.COM menu. When you execute
- CLUSTER_CONFIG.COM to add a satellite node, you will be asked a series of
- questions for which the command procedure will supply most default values.
- For Local Area clusters that are the subject of this manual, the default
- values are sufficient. (If your cluster has special requirements and you
- want to learn more about values other than the dfaults, you should consult
- the VAXcluster documentation in the extended VMS documentation set. )
-
- There are some values that you must supply. These include the following:
-
- : DECnet node name and node address for each satellite--The node name has up
- to 6 alphnumeric characters. The node address should be supplied by your
- network manager.
-
- : Satellite's Ethernet hardware address--The Ethernet hardware address has
- the form xx-xx-xx-xx-xx-xx. You must include the hyphens when specifying
- the hardware address.
-
- To obtain the Ethernet hardware address for MicroVAX II and VAXstation II
- satellites, enter the follwoing commands at the satellite's console:
-
- >>> B/100 XQ
-
- Bootfile: READ_ADDR
-
- For MicroVAX 2000 and VAXstation 2000 satellites, enter the following
- commands at successive console-mode prompts:
-
- >>> T 53
- 2 ?>>> 3
- >>> B/100 ES
- bootfile: READ_ADDR
-
- (In this example, if the second prompt appears as 3 ?>>>, press RETURN.)
-
- For 3xxx series satellites, enter the following command at the satellite's
- console:
-
- >>> SHOW ETHERNET
-
- : Workstation windowing system: the windowing system ( for example, UIS ),
- if your satellite is a workstation.
-
- 7.4 DECnet-VAX Connections
-
- In any cluster configration, DECnet-VAX connections are required for all
- processor nodes. Use of DECnet-VAX facilities ensures that cluster managers
- can access each node in the cluster from a single terminal, even if
- terminal-switching facilities are not available.
-
- In local area clusters, DECnet is required both for system management
- functions and interprocessor communication. For example, DECnet is used for
- remote booting operations ( downline loading of satellite nodes ).
-
- In these configurations, DECnet and System Communication Services coexist on
- the same Ethernet. They share the same data link and physical link
- protocols, which are implemented by the Ethernet data link drivers, the
- Ethernet adapters, and the Ethernet itself.
-
- $_END OF NIA038
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