Introduction

Veritas Volume Manager (VxVM) has become the standard Logical Volume Manager (LVM) in many enterprises for its robust feature set, its ability to run on multiple operating systems (e.g., HP-UX, Linux, Solaris, Windows), and the numerous scalability, availability, and recoverability features that come with the base product. The recoverability features help to ensure that data is protected when hardware platforms fail and to ease the process required to restore systems to an operational state.

This article will provide an introduction to two important and often overlooked recovery features: failure notifications and configuration database backups. The article will also provide two disaster-recovery case studies to show how these recovery features can be used to aide in recovering from disasters when they strike. A basic knowledge of Veritas Volume Manager will be assumed. If you are new to Veritas Volume Manager, consult the vxintro(1m) man page for an introduction to terminology and basic usage.
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This document describes the configuration of a two or more node Solaris
Cluster using Veritas Cluster Server VCS 1.1.2 on Solaris 2.6. Number
of standard UNIX services are configured as Cluster Service Groups:
user home directories, NIS naming services, time synchronization (NTP).
In addition a popular Software Configuration Management system from
Rational - ClearCase is configured as a set of cluster service groups.

Configuration of various software components in the form
of a cluster Service Group allows for high availability of the application
as well as load balancing (fail-over or switch-over). Beside that cluster
configuration allows to free a node in the network for upgrades, testing
or reconfiguration and then bring it back to service very quickly with
little or no additional work.

- Cluster topology.

The cluster topology used here is called clustered pairs. Two nodes
share disk on a single shared SCSI bus. Both computers and the disk
are connected in a chain on a SCSI bus. Both differential or fast-wide
SCSI buses can be used. Each SCSI host adapter in each node is assigned
different SCSI id (called initiator id) so both computers can coexist
on the same bus.

» Continue reading “VCS Howto”