Novell Cluster Services

Choosing the Right File System Type for Cluster Volumes on Linux

On OES Linux, you can create clustered NSS volumes as described previously as well. In a rolling cluster migration, it is even possible to mount an NSS volume created on OES NetWare on an OES Linux node. You can read the procedure given previously to learn all about the configuration of cluster-enabled NSS volumes on OES Linux the NSSMU tool described previously is available in OES Linux as well. If, however, you don't need any of the specific benefits offered by NSS, you can cluster...

Squid High Availability Design Considerations

For a server that works with a large number of configuration files that need to be the same on all cluster nodes, shared storage is an important issue. If a traditional Linux service such as Squid is clustered, it would make sense to use an ext3 or Reiser file system for shared storage. If, however, the customer does not care about the availability of the cache files because they can always be built up anew when a server fails, we can configure the cluster solution without shared storage for...

Poly Serve Matrix Server

This high-availability product belongs to the category of datacenter clusters that we described at the beginning of this section. It is a clustering solution for SUSE Linux Enterprise Server that can run applications like Oracle databases or web servers. The applications can run on several nodes in the cluster simultaneously. Figure 1.4 shows a typical PolyServe cluster with NFS exports. With that you can balance the load of an application, and when a node fails the application remains...

Email alerts should be sent

Enter the IP address or DNS name of your outgoing SMTP server in the Primary Mail Server Name field. Click Save to store this data before continuing. Make sure that if you are using the DNS entry, all your cluster nodes can resolve that name to the correct IP address. 5. You can enter an optional second mail server address and an identifier that will display where the message originated from. We suggest that for the latter option, you use the server name in that fieldfor example, srvi...

Novells Backup Software

These are the two applications Novell provides in Open Enterprise Server to create backups The sbcon.nlm backup software for NetWare is a menu-based backup utility that runs on the server with local storage devices to create backups and restore data in a very simple way. We think that the menu, displayed in Figure 9.5, is self-explanatory. The only preparatory step you must take to run a backup is to have the correct TSA loaded. For example, load tsafs.nlm or tsands.nlm. Figure 9.5. On NetWare...

Figure 810 Configure the settings for the new post office

T f OEfTREE) 9 oei e-'giUS e- ecu e- BEK IB UON oesllnl B ai lln -- a oesllnj iGMTtDUOQ Aiinlndiin, Rrrliri. t-rrrx fiunir, S n _ - ri n jir 17111ii iuCli h i) irf ilnri . Ontt Librar, Deime iddlilonil jnapetiiei C inEr jjinlJirr jimt nTfk* In the next dialog box you must set up the link for the new post office. Just as with the first post office, this must be a TCP IP link. The IP address, as we planned in Table 8.2 , will be 10.0.0.68 , and the port numbers will be as listed here Click Finish...

Preparing the Linux Cluster to Install Groupwise

We start with preparatory steps on our cluster before installing GroupWise. We want to have the shared disks and resources configured so that the shared data store is online and tested. For the system where we are installing GroupWise, we have already created EVMS volumes that can be mounted as grpwise gwdom1 and grpwise gwpo1 . How to create a shared EVMS volume is explained in detail in Chapter 5 . Perform the following steps to prepare your cluster for the GroupWise installation 1. First...

Managing Novell Cluster Services from the Command Line

When tuning and troubleshooting Novell Cluster Services, the administrator has the important task of managing Cluster Services from the command line. For this purpose, the cluster command was created. This command has many options that can be used from the command line to manage the cluster environment. All the commands in the following list are arguments for the cluster command for example, the command down should be used as cluster down . To indicate whether the command can be used on...

Creating Clustered Volumes on OES Linux and Net Ware

After setting up the cluster, the first step to take is to set up the clustered volumes. This procedure involves three main steps 1. Create shared disk partitions 3. Create clustered volume objects The following procedure describes all necessary steps. The procedure is applicable to NetWare as well as Linux. Any differences between the operating systems are marked as such. Before shared disk partitions can be created, Novell Cluster Services must be installed. After installation of Novell...

Mware Clustering Configuration

VMware clustering configuration is detailed in the following subsections. Adding a Shared Disk in VMware ESX Server There are two possibilities to set up clustering for virtual machines in VMware ESX Server. You can either use a physical LUN (Logical Unit) from your SAN and assign that to two or more virtual machines, or create a new virtual disk file and add that to the virtual machines. Configuration of the virtual machines can be performed from the Management Interface, from the Remote...

Removing an OES Net Ware Node from the Cluster

When you're migrating a NetWare cluster to Linux, after a successful migration your NetWare node should be removed. Also, before taking out a NetWare node, you should remove it properly from the cluster. The following procedure describes how to perform this task 1. On the NetWare console, type cluster leave to leave the cluster. 2. Enter uldncs to unload Novell Cluster Services. 3. Delete the cluster node object from iManager (see Figure 4.12). This is the object added for this node in the...

Prepare the Cluster

Setting up a cluster without shared storage is done in the same way as when shared storage is involved. We will provide the basic steps here. First, plan which two servers you want to use for this cluster and what the cluster's IP address will be. This must be an address in the same subnet that your servers are already in. Also, decide where the cluster container object must be placed in your tree. The actual installation for a NetWare cluster is performed with the Deployment Manager...

EDirectory Cluster Guidelines

Novell Cluster Services uses eDirectory as its repository for configuration information, and eDirectory also is the main database where information is stored about all resources that are configured for access to the cluster. Most applications that run on the cluster also use eDirectory to store their configuration and to control access to its resources. The cluster configuration is stored in the cluster container. This container object itself contains general configuration information for the...

Calculating Average Downtime

There are two terms you should know when you need to calculate what your downtime can be if a component in your environment fails. They are Mean Time Between Failure (MTBF) and Mean Time to Repair (MTTR). The MTBF is the average time it takes for a component to fail. Let us, for example, take a look at a randomly chosen component the Intel SRCU42L RAID Controller. For this controller Intel reports a MTBF of 807,267 hours. If we do the math, what we will learn is that this adapter will fail, on...

Business Continuity Clustering

Business Continuity Clustering is based on Novell Cluster Services, and it simply is a cluster of clusters. With this solution, if a cluster fails, a cluster at another site can take over its services and continue operations. Figure 1.3 provides a graphical overview of a basic Business Continuity Cluster (BCC). We will discuss the architecture in this section to the level that you can understand what BCC is. Chapter 12, Introduction to Business Continuity Clustering, contains a full technical...