Using an attribute of a write request to determine where to cache data in a storage system having multiple caches including non-volatile storage cache in a sequential access storage device

摘要

Provided are a computer program product, system, and method for using an attribute of a write request to determine where to cache data in a storage system having multiple caches including non-volatile storage cache in a sequential access storage device. Received modified tracks are cached in the non-volatile storage device integrated with the sequential access storage device in response to determining to cache the modified tracks. A write request having modified tracks is received. A determination is made as to whether an attribute of the received write request satisfies a condition. The received modified tracks for the write request are cached in the non-volatile storage device in response to determining that the determined attribute does not satisfy the condition. A destage request is added to a request queue for the received write request having the determined attribute not satisfying the condition.

主权项

1. A method for managing data in a sequential access storage device receiving read requests and write requests from a system with respect to tracks stored in a sequential access storage medium, comprising:
caching received modified tracks in a non-volatile storage device integrated with the sequential access storage device in response to determining to cache the modified tracks; receiving a write request having modified tracks; determining whether an attribute of the received write request satisfies a condition; caching the received modified tracks for the write request in the non-volatile storage device in response to determining that the determined attribute does not satisfy the condition; adding a destage request to a request queue for the received write request having the determined attribute not satisfying the condition; and writing the received modified tracks for the write request having the determined attribute satisfying the condition at a higher priority than modified tracks for write requests having the attribute not satisfying the condition.