Alessandro Di Marco

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A cluster of PCs can be seen as a collection of networked low cost disks; such a collection can be operated by proper software so as to provide the abstraction of a single, larger block device. By adding suitable data redundancy, such a disk collection as a whole could act as single, highly fault tolerant, distributed RAID device, providing capacity and(More)
The results obtained with the total exposure of 1.04 ton × yr collected by DAMA/LIBRA–phase1 deep underground at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N. during 7 annual cycles (i.e. adding a further 0.17 ton × yr exposure) are presented. The DAMA/LIBRA– phase1 data give evidence for the presence of Dark Matter (DM) particles in the(More)
In the last couple of years, hard-disk technology has experienced an unjustified progressive boost of the built-in cache size, affecting both the power consumption and the reliability of stored data. Large built-in caches offer limited benefits in terms of performance with respect to the smaller ones. Moreover, they need to be kept in write-through mode to(More)
Any set of autonomous workstations, however networked (by a LAN, a MAN, or wireless), can be seen as a collection of networked low cost disks. Such a collection can be operated by proper software so as to provide the abstraction of a single, larger block device, made available to all the participants on a peer-to-peer basis. By adding enough data(More)
We consider the dynamics of a quantum phase-slip junction (QPSJ), a dual Josephson junction, connected to a microwave source with frequency ω mw. With respect to an ordinary Josephson junction, a QPSJ can sustain dual Shapiro steps, consisting of well-defined current plateaus at multiple integers of eω mw /π in the current-voltage (I-V) characteristic. The(More)
Commodity EIDE disks provide low cost storage but are severely limited in bandwidth and cannot be made fault-tolerant. On the other hand, conventional RAID devices provide reliability and performance but worse price/performance figures. A cluster of PCs can be seen as a collection of networked low cost disks; such a collection can be operated by proper(More)
Any set of autonomous workstations, however networked (by a LAN, a MAN, or wireless), can be seen as a collection of networked low cost disks. Such a collection can be operated by proper software so as to provide the abstraction of a single, larger block device, made available to all the participants on a peer-to-peer basis. By adding enough data(More)
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