- Clustering
Clustering is a technique to improve availability by configuring redundant resources such that if one instance fails it does not disrupt system availability to users.
- DVIPA
Dynamic virtual IP address (DVIPA) is a z/OS Communications Server feature used to describe the automatic failover of TCP/IP stack instances within a Sysplex cluster.
See Setting up your EntireX Environment for Sysplex.- Failover
Feature used to describe the control switch between redundant resources in the event of a resource failure.
- Fault Tolerance
Describes the process of delivering continuous operation in the event of an unplanned outage.
- High Availability
Under High Availability we understand an environment with engineered redundancy which, if any one component fails, guarantees the integrity of the system as a whole. To achieve high availability, EntireX uses existing third-party clustering technology.
- HiperSockets
HiperSockets is an IBM technology for offering TCP/IP communications between partitions at in-memory speed.
- Load Balancing
A network-based technique to distribute common workload across multiple back-end services that can be evenly distributed or routed based on weighted inference of a key performance attribute (commonly called filtering).
- LPAR
A logical partition (LPAR) describes the virtualization of the System z hardware platform; if one LPAR goes down it has no effect on any others running on the same hardware.
- NLB
Network Load Balancing (NLB) is a clustering technology for Windows servers that enhances the scalability and availability of mission-critical, TCP/IP-based services, such as Web, Terminal Services, virtual private networking, and streaming media servers.
See Setting up your EntireX Environment for NLB- Node Convergence
The process of converging static machine addresses into a clustered IP address on Windows.
- Queued Direct I/O (QDIO)
Queued Direct I/O (QDIO) is a System z hardware feature offering an enhanced data transfer architecture for improving data transfer speed and efficiency for TCP/IP traffic.
- Sysplex
A Parallel Sysplex is a cluster of IBM mainframes acting together as a single system image with z/OS. Parallel Sysplex combines data sharing and parallel computing to allow a cluster of up to 32 systems to share a workload for high performance and high availability.
See Setting up your EntireX Environment for Sysplex- Transaction Recovery
A feature for recovering resources in the event of an unplanned outage.
- VIPA
Virtual IP addressing is an IP address assigned to multiple static IP addresses to make them accessible as one address for the purpose of improving availability or load balancing.
- WLM
IBM Workload Manager is a Sysplex based load balancer offering workload filtering.
- 24x7
A business definition for highly available applications representing 24 hours, 7 days a week availability.
- 99.999
A business definition for highly available applications representing a percentage very close to 100% availability.