ࡱ> oM  5bjbj== %XWW0Dl\\\\\\\p<.<.<.8t..dpS4./"0/0/0/C0C0C0JSLSLSLSLSLSLS$U XpS\C0?0C0C0C0pS5\\0/0/S555C0\0/\0/JS5C0JS5d 5>PD\\JS0/. .dp<.Q2&R&JSS0SLRX2XJS5pp\\\\  RSF-1 Technical Whitepaper Revision 2.0 Date: May 1, 2000 Abstract An overview of technical features and functionality of RSF-1 High Availability management software for mission critical environments. Contents 1 Product Overview 4 2 Features 4 2.1 Heartbeats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1.1 Network Heartbeat . . . . . . . . . . . . . . . . . . . . . 5 2.1.2 Serial Heartbeat . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1.3 Disk Heartbeat . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 RSF-1 Cluster Manager . . . . . . . . . . . . . . . . . . . . . 6 2.3 Files and Directories . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Hardware Monitoring . . . . . . . . . . . . . . . . . . . . . . 7 2.5 Application Monitoring . . . . . . . . . . . . . . . . . . . . 7 3 System Requirements 8 3.1 Supported Hardware . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 Supported Software . . . . . . . . . . . . . . . . . . . . . . . . 9 3.3 Space Requirements . . . . . . . . . . . . . . . . . . . . . . . . 9 3.4 Serial Cable Requirements . . . . . . . . . . . . . . . . . . . 9 4 Example Configuration 10 5 Acknowledgements 12 1 Product Overview What is RSF-1? RSF-1 is a High Availability management product designed to provide increased uptime and resilience on mission critical servers. What is High Availability? High Availability makes a service or application as resilient as possible against hardware, software, network and power failure, allowing critical systems to continue to operate with minimal disruption and hence lower risk to a business. How can High Availability be achieved? High availability is achieved by identifying and removing all possible single points of failure within a system and its environment, and by having well rehearsed procedures in place to recover as quickly and securely as possible with minimal disruption. How does RSF-1 provide a High Availability environment? RSF-1 (Redundant Server Facility) makes applications and services highly available by automatically switching them between redundant servers if one fails. It provides a bi-directional facility allowing servers to be paired up and `shadow' each other through continuous, automatic monitoring. 2 Features During system boot-up, the RSF-1 Monitor daemon is started which attempts to communicate with its service partner over the available heartbeat connections. If a connection cannot be established within a short period, the system presumes its partner is not alive and starts its local primary services. If, after a further period has elapsed, communication remains unestablished then the remote primary services are started as local secondary services. When the remote host eventually recovers, it will communicate with its sibling to determine service status, and will not start any services already running. If the remote is available, then status information is relayed to determine if the remote is running this server's primary services as secondary; if not, they are started locally. In all situations current status information is relayed between the two servers when both monitors are active. 2.1 Heartbeats RSF-1 determines availability of servers using intelligent handshake communications through multi-protocol heartbeat agents. The heartbeat agents currently available are: Network (TCP/IP) RS-232C (serial, non-IP protocol) Multiple shared disk connections When all heartbeat mechanisms fail and communication between two servers is broken, the remaining live system presumes the other has failed and begins to take over any services previously running on it. At least one heartbeat mechanism needs to be available for successful operation of RSF-1; it is, however, strongly recommended that at least two heartbeats are used to avoid possible false alarms, and that these use different communication mechanisms. 2.1.1 Network Heartbeat Network connections can be through public or private networks. Any network infrastructures that supports IP can be used, including: Thin-wire Ethernet UTP Ethernet (10Mbs/100Mbs) Token-Ring (4Mb/16Mb) FDDI ATM As most installations require that clients connect to servers via a public network, a public network interface is required for configuring the `floating' IP addresses used by the clients. 2.1.2 Serial Heartbeat The serial connection is made using a null modem cable between the two servers, which must be capable of operating at 9600 baud. The currently supported length of such cables is 185 feet (100 m). This limitation can be extended through the use of line drivers or serial repeaters, although this is not normally recommended as it introduces further single points of failure. 2.1.3 Disk Heartbeat Communication through disk is accomplished by utilizing a shared disk partition of 1Mb in size, on which the servers read and write handshake information. This partition must not be under the control of any volume management product. Multiple disk heartbeats can be used when multiple shared disk systems are components of the mission-critical environment. When used on systems that do not require shared data storage, such as firewalls, the disk heartbeat can be removed, although we recommend that both network and serial heartbeats be used instead. 2.2 RSF-1 Cluster Manager The RSF-1 Cluster Manager is the administrative tool for RSF-1. It is Java based which allows it to be run on any platform with Java support. To run the RSF-1 Cluster Manager, Java Runtime Environment (JRE) 1.2.2 or greater is required. RSF-1 Cluster Manager allows the cluster administrator to monitor services and servers, start, stop, or move services across the cluster, view heartbeat status, and read pertinent logs. Figure 1 shows the RSF-1 Cluster Manager.  Figure 1: RSF-1 Cluster Manager 2.3 Files and Directories RSF-1 is supplied as a standard platform-compatible package, and installs under /opt/RSIrsf, with the hierarchy shown in figure 3.  The rc.servicename.d directories contain the application start-up and shutdown scripts for each service instance in the form of standard boot scripts. This greatly simplifies the process of putting third party applications under RSF-1 control. 2.4 Hardware Monitoring RSF-1 can optionally provide monitoring for hardware components in the server. Agents are added that monitor critical hardware links for an application. Agents include: Netmon monitors physical network interfaces SCSImon monitors status of shared SCSI drives FSmon monitors status of file systems 2.5 Application Monitoring RSF-1 can also provide application level monitoring. Dependant on the environment, it is often inadequate to monitor only the status of the server as a whole. Application monitoring is intended to emulate actual client-based requests to the application. For example, in a typical e-commerce cluster, there are several critical components that must all be running to effectively provide a solution. Just having the server up or having a PID exist is not sufficient, because applications are not fault tolerant. Programs freeze and servers crash; this is a fact of life. Application monitoring is the highest level of monitoring available. By sending a SQL / PL SQL based query to a database, requesting a web page, or sending pop3 requests, RSF-1 can act appropriately to a failure to respond, or to a incorrect response. RSF-1 also includes a customizable API, which allows users to write their own agents to monitor their custom applications. Current applications / protocols supported are: Academy CAP (Common AppleTalk Protocol) Checkpoint/Solstice FireWall-1 Servers for diskless (boot) clients DNS HP OpenMail Helios Ethershare Informix Ingres Kondor Plus risk management software NFS Oracle 7.x, 8i PC-NFS (authentication daemon) POP3 Print spooling (Solstice Print Client, PLP) Progress Radius Remedy Action Request System Samba SAP R/3 SMTP Solstice Autoclient Solstice DiskSuite 4.x Swift Alliance Sybase Universe Veritas/Sun Volume Manager 2.x Web Servers (Apache, Sun Web Server) Web Proxies 3 System Requirements Each server must have its own unique hostname and IP address, together with a floating name and address, which will migrate between primary and secondary servers during service switchover. Each server must also have a spare serial port if RSF-1 Serial Monitoring is to be used, and/or a dual-ported disk if RSF-1 Disk Monitoring is to be used. This is highly recommended as reliance on a single TCP/IP connection can cause unexpected failovers and alerts during excessive congestion or routing problems. 3.1 Supported Hardware All Sun SPARC workstations and servers SPARCstorage Array (using Solstice DiskSuite or Volume Manager) IBM PowerPC SGI Intel Hewlett-Packard servers Most SCSI disk and RAID subsystems 3.2 Supported Software Sun Solaris 2.4 and above (SPARC and x86) IBM AIX 4.1.5 and 4.2 HP-UX 10.x and above IRIX 6.x Linux 2.x FreeBSD 2.2.5 and above 3.3 Space requirements 2Mb in /opt 50Kb in /etc 3.4 Serial Cable Specification The cable ends will depend on the hardware of the two servers forming the RSF-1 cluster. Typically, a null modem cable capable of being driven at 9600bps is required. A typical pin out should be : Pin Pin 3 2 7 7 4 Example Configuration The diagram in figure 5 outlines an example configuration of two servers with a shared disk, one running an Oracle server (mickey, with floating name oracle), and one acting as an NFS host (minnie, with floating name nfs). The Oracle database and NFS filesystems are held on the shared disk subsystem.  Figure 5 also shows a workstation mounting NFS filesystems from nfs and a PC running an Oracle client connecting to oracle. If minnie fails, NFS services to the client will suspend and console messages of NFS Server nfs not responding will appear (figure 6). Within two minutes, the standby server mickey will sense the failure and will take over the NFS services. As soon as mickey restarts the services, the client's console will show the message NFS Server OK, and the client will continue without realizing that a server failover has taken place. All interaction between the Oracle client and server is maintained with no loss of service or disruption.  In the event of a hardware failure on minnie, a hardware call could be logged with the system supplier, an engineer called out to fix the fault, and the system brought back online. When minnie reboots, RSF-1 monitoring will restart. As soon as connections are established, minnie will determine that mickey is running both its primary and secondary services, and will therefore not start either. If it is required that primary services (NFS) are restarted on minnie, an operator can initiate a controlled switchover using RSF-1 Cluster Manager. The diagram in figure 7 shows mickey running both primary (oracle) and secondary (nfs) services, and advertising both floating names: oracle and nfs.  EMBED Photoshop.Image.5 \s  Both service clients will continue to be operational. 5 Acknowledgements Sun, SPARC, Solaris, SunOS, Solstice, DiskSuite and Java are trademarks of Sun Microsystems Inc and SPARC International Inc AIX and PowerPC are trademarks of International Business Machines Corp. HP-UX and OpenView are trademarks of Hewlett-Packard Company. IRIX is a trademark of Silicon Graphics Inc. MIPS is a registered trademark of MIPS Technologies, Inc. FireWall-1 is a trademark of Check Point Software Technologies Ltd. Oracle is a registered trademark of Oracle Corp. Informix is a registered trademark of Informix Corp. Sybase is a trademark of Sybase, Inc. Ingress is a trademark of Computer Associates International, Inc. 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