background Clear Voice T elecom provides businesses of all sizes with high quality hosted IP PBX solutions that dramatically reduce startup costs, upgrade costs, and total cost of ownership. Its slogan: “Eliminate the need for on-site hardware and take the burden off your IT staff. Let the experts at Clear Voice T elecom handle your telecommunication needs.” business challenge In 2007, Clear Voice T elecom began investigating High Availability clustering to ensure minimum downtime and high performance of their hosted PBX solutions. Sun Cluster turned out to be more complex than expected; combined with its high entry barrier and cost for maintenance, Clear Voice started looking elsewhere. solution When Peter Petroff, Sr. Network Engineer at Clear Voice, tried out DRBD® for the

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