A data placement strategy on MZR for VOD servers

The number of concurrent users in VOD servers mainly depend on the disk placement strategies of video blocks. Especially, the storage server should make the most of MZR (multi-zone recording) disks´ characteristics. The variable transfer rates and capacity in zones feature the MZR disk, so the outward zones have more transfer rates and capacity than inward zones. Also, Users´ access patterns concentrate on the popular videos. So, if the popular video blocks are placed at the outward zones, the number of concurrent users can be increased. In this paper we present the popularity-based variable way placement strategy for disk groups (PVW) based on the LP and the SHP. The PVW aims to effectively support popular streams of high access rates without additional storage capacity. The more popular video blocks are to be placed in all disk groups to utilize the total bandwidth of a storage subsystem, and the less popular video blocks are to be placed in the small disk groups. By the simulation study, we have found that more users could be supported by this strategy