Placement-Related Problems in Shared Disk I/O
Varman, Peter J.
In a shared-disk parallel I/O system, several processes may be accessing the disks concurrently. An important example is concurrent external merging arising in database management systems with multiple independent sort queries. Such a system may exhibit instability, with one of the processes racing ahead of the others and monopolizing I/O resources. This race can lead to serialization of the processes and poor disk utilization, even when the static load on the disks is balanced. The phenomenon can be avoided by proper layout of data on the disks, as well as through other I/O management strategies. This has implications for both data placement in multiple disk systems and task partitioning for parallel processing.
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- ECE Publications