In MPLS networks, failure resilience of a Label Switched Path (LSP) is essential in guaranteeing the QoS of the path. This can be achieved by allocating backup LSPs through which packets can be routed in case of primary LSP failiures. bandwidth efficiency and expeditious path restoration are two desirable features for the design of backup LSPs. This paper tackles the bandwidth efficiency with a...

We consider a network of computers consisting of file servers and a Database Management System (DBMS) where a linkage is maintained, with referential integrity, between data in the DBMS and files in the file servers which are external to the DBMS. We present algorithms for performing backup and recovery of the DBMS data in a coordinated fashion with the files on the file servers. When a file is...

One of the most fundamental elements of any disaster recovery plan is data backup and recovery. If an IT staff lacks the ability to recover lost data following an incident or disaster, redundant hardware or hot sites are of only limited value. Relatively few years ago, planning a backup strategy was reasonably straightforward for the small-office-home-office (SOHO) and small-tomedium-sized-busi...

abstract one of the basic assumptions in hub covering problems is considering the covering radius as an exogenous parameter which cannot be controlled by the decision maker. practically and in many real world cases with a negligible increase in costs, to increase the covering radii, it is possible to save the costs of establishing additional hub nodes. change in problem parameters during the pl...

This paper presents a bi-objective capacitated hub arc location problem with single assignment for designing a metro network with an elastic demand. In the literature, it is widely supposed that the network created with the hub nodes is complete. In this paper, this assumption is relaxed. Moreover, in most hub location problems, the demand is assumed to be static and independent of the location...

Resource redundancy is a primary way to improve availability for applications in computational grid. How to select backup resources for an application during the resource allocation phase and how to make advanced reservation for backup resources are challenging issues for grid environment to provide high availability service. In this paper, we proposed a backup resources selection algorithm bas...

This paper considers the following backup scheme for a database system: a database is updated at a nonhomogeneous Poisson process and an amount of updated files accumulates additively. To ensure the safety of data, full backup are performed at time NT=L or when the database fails, whichever occurs first, and between them, incremental backups are made at periodic times iT (i=1, 2, ..., N-1) so a...

In the emerging next-generation transport networks, called intelligent optical transport networks, DWDM-based optical components like add-drop multiplexers and optical cross connects will have full knowledge of the wavelengths in the network, status, and traffic carrying capacity of each wavelength. With such intelligence, these intelligent optical networks could create self-connecting and self...