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Multiple enhanced catalog sharing (ECS) cache structure for sharing catalogs in a multiprocessor system
Multiple enhanced catalog sharing (ECS) cache structure for sharing catalogs in a multiprocessor system
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机译:多个增强的目录共享(ECS)缓存结构,用于在多处理器系统中共享目录
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摘要
Various method and system embodiments for facilitating catalog sharing in multiprocessor systems use multiple ECS cache structures to which catalogs are assigned based on an attribute such as SMS storage class or a high level qualifier (HLQ) (e.g. an N-to-1 mapping) or each individual catalog (e.g. a 1-to-1 mapping). When maintenance is performed on an ECS shared catalog, the multiple ECS cache structure requires only those catalogs associated with a particular ECS cache structure be disconnected. Any catalogs in the structure that are not involved in or affected by the maintenance may be temporarily or permanently moved to a different ECS cache structure. As a result, VVDS sharing is only required for those catalogs on which maintenance is being performed or that remain associated with that ECS cache structure during maintenance. This reduces I/O activity to the DASD, and results in a significant overall performance improvement.
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