z/VM Module 13: System Integrity and High Availability . Objectives. Describe the fundamental aspects of system integrity Read and understand the System Integrity Statement for z/VM issued by IBM List the characteristics needed to implement system integrity for z/VM
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for high availability.
Andrew File System (AFS) -- a distributed network file system without a single point of failure. The effort needed to set up and manage this file system is high.
Address Resolution Protocol (ARP) --Address Resolution Protocol; for mapping an IP address to a physical machine address.
Cold Standby: -- A system in which the redundant component is in an inactive or idle state and must be initialized to bring it online.
Continuous availability: -- a system with nonstop service (High availability does not equate to continuous availability.)
Data high availability: -- means that data survives a system failure and is available to the system that has taken over the failed system.
EXT3: -- a journaling extension to the standard ext2 file system on Linux; it results in massively reducing time spent recovering a file system after a crash.
GDPS: (Geographically Dispersed Parallel Sysplex) is a multi-site application availability solution that provides the ability to manage the remote copy configuration and storage. subsystem, automates Parallel Sysplex operational task, and performs failure recovery from a single point of control.
High Availability: maintaining maximum system uptime.
Hot Standby: is a scenario where the secondary components share some state with the active server; in case of a failure, the takeover time is reduced compared to a Cold Standby.
RAID: Redundant Array of Inexpensive Disks.
ReiserFS: -- A file system using a plug-in based object-oriented variant on classical balanced tree algorithms.
Start Interpretive Execution (SIE): -- a virtual machine command originally introduced for use by VM/XA, to initiate the execution of a guest system.
STONITH: Shoot The Other Node In The Head.
System Integrity: allows the z/VM CP to operate without interference or harm, intentional or not, from guest systems.
Amrehn, Erich and Ronald Annuss. Linux on IBM zSeries and S/390: High Availability for z/VM and Linux. IBM Redbooks, 2002
Altmark, Alan and Cliff Laking. z/VM Security and Integrity. IBM, May 2002.
Altmark, Alan. z/VM Security and integrity. IBM V60, 2002.