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This "automated with manual approval" configuration runs automatically once a human has approved the failover. Failback is the process of restoring a system, component, or service previously in a state of failure back to its original, working state, and having the standby system go from functioning back to standby.
Switchover is the manual switch from one system to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active server, system, or network, or to perform system maintenance, such as installing patches, and upgrading software or hardware. [1]
The application must not corrupt data if it crashes, or restarts from the saved state. A number of these constraints can be minimized through the use of virtual server environments, wherein the hypervisor itself is cluster-aware and provides seamless migration of virtual machines (including running memory state) between physical hosts—see ...
Zero-copy programming techniques can be used when exchanging data within a user space process (i.e. between two or more threads, etc.) and/or between two or more processes (see also producer–consumer problem) and/or when data has to be accessed / copied / moved inside kernel space or between a user space process and kernel space portions of operating systems (OS).
Load balancing, however, sometimes uses data replication (especially multi-master replication) internally, to distribute its data among machines. Backup differs from replication in that the saved copy of data remains unchanged for a long period of time. [5] Replicas, on the other hand, undergo frequent updates and quickly lose any historical state.
The hot spare disk reduces the mean time to recovery (MTTR) for the RAID redundancy group, thus reducing the probability of a second disk failure and the resultant data loss that would occur in any singly redundant RAID (e.g., RAID-1, RAID-5, RAID-10). Typically, a hot spare is available to replace a number of different disks and systems ...
MOVEit is a managed file transfer software product produced by Ipswitch, Inc. (now part of Progress Software). [3] MOVEit encrypts files and uses file transfer protocols such as FTP() or SFTP to transfer data, as well as providing automation services, analytics and failover options.
Other databases such as Adaptive Server Enterprise and Oracle Database support the technique but require the Database Administrator to write code or scripts to perform the work. Although the actual failover mechanism in log shipping is manual, this implementation is often chosen due to its low cost in human and server resources, and ease of ...