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The database and FUSE-based Proxmox Cluster file system (pmxcfs [31]) makes it possible to perform the configuration of each cluster node via the Corosync communication stack with SQLite engine. [13] Another HA-related element in PVE is the distributed file system Ceph, which can be used as a shared storage for guest machines. [32]
Once the event occurs for which the process is waiting ("is blocked on"), the process is advanced from blocked state to an imminent one, such as runnable. In a multitasking computer system, individual tasks, or threads of execution, must share the resources of the system. Shared resources include: the CPU, network and network interfaces, memory ...
The system automatically notices that the disk has changed and updates the mount point contents to reflect the new medium. Similar functionality is found on Windows machines. An automounter will automatically mount a file system when a reference is made to the directory atop which it should be mounted. This is usually used for file systems on ...
Each operation then has to obtain a read quorum (V r) or a write quorum (V w) to read or write a data item, respectively. If a given data item has a total of V votes, the quorums have to obey the following rules: V r + V w > V; V w > V/2; The first rule ensures that a data item is not read and written by two transactions concurrently.
There may be many "ready" processes at any one point of the system's execution—for example, in a one-processor system, only one process can be executing at any one time, and all other "concurrently executing" processes will be waiting for execution. A ready queue or run queue is used in computer scheduling. Modern computers are capable of ...
The waiting primitive can be a busy-wait loop or an OS-provided primitive that prevents the thread from being scheduled until it is ready to proceed. Here is an example pseudocode implementation of parts of a threading system and mutexes and Mesa-style condition variables, using test-and-set and a first-come, first-served policy:
In computer science, an input queue is a collection of processes in storage that are waiting to be brought into memory to run a program. Input queues are mainly used in Operating System Scheduling which is a technique for distributing resources among processes.
In this system, individual nodes sense that there is a population of other nodes with similar data to report. The population then nominates just one node to report the data, resulting in power savings. [103] Ad hoc wireless networks can also benefit from quorum sensing, by allowing the system to detect and respond to network conditions. [104]