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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]
Operand forwarding (or data forwarding) is an optimization in pipelined CPUs to limit performance deficits which occur due to pipeline stalls. [ 1 ] [ 2 ] A data hazard can lead to a pipeline stall when the current operation has to wait for the results of an earlier operation which has not yet finished.
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.
A mount point is a location in the partition used as a root filesystem. Many different types of storage exist, including magnetic, magneto-optical, optical, and semiconductor (solid-state) drives. Many different types of storage exist, including magnetic, magneto-optical, optical, and semiconductor (solid-state) drives.
When the processor needs to access external memory, it starts placing the address of the requested information on the address bus. It then must wait for the answer, that may come back tens if not hundreds of cycles later. Each of the cycles spent waiting is called a wait state. Wait states are a pure waste of a processor's performance.
In computer science and software engineering, busy-waiting, busy-looping or spinning is a technique in which a process repeatedly checks to see if a condition is true, such as whether keyboard input or a lock is available. Spinning can also be used to generate an arbitrary time delay, a technique that was necessary on systems that lacked a ...
As an example application of union mounting, consider the need to update the information contained on a CD-ROM or DVD. While a CD-ROM is not writable, one can overlay the CD's mount point with a writable directory in a union mount. Then, updating files in the union directory will cause them to end up in the writable directory, giving the ...
An M/M/∞ queue is a stochastic process whose state space is the set {0,1,2,3,...} where the value corresponds to the number of customers currently being served. Since, the number of servers in parallel is infinite, there is no queue and the number of customers in the systems coincides with the number of customers being served at any moment.