Tape-managed partition support for effective workload allocation and space management

摘要

In one embodiment, a system includes a disk cache and a controller configured to create a cache resident partition in the disk cache, the cache resident partition being configured to store data thereto that is not subject to HSM, manage the cache resident partition to have a size that is greater than a first minimum size and less than or equal to a total size of the disk cache, receive data to store to the disk cache, store the data to the cache resident partition at least initially, create tape-managed partitions in the disk cache, each of the tape-managed partitions being configured to store data that is subject to HSM, and manage the tape-managed partitions to have a size that is greater than a second minimum size and less than or equal to a total size of the disk cache less a size of all other partitions combined.

主权项

1. A system, comprising:
a disk cache comprising a plurality of hard disk drives (HDDs); and a controller configured to:
create a cache resident partition in the disk cache, the cache resident partition being configured to store data thereto that is not subject to hierarchical storage management (HSM);manage the cache resident partition to have a size that is greater than a first minimum size and less than or equal to a total size of the disk cache;receive data to store to the disk cache;store the data to the cache resident partition at least initially;create one or more tape-managed partitions in the disk cache, each of the one or more tape-managed partitions being configured to store data that is subject to HSM;manage the one or more tape-managed partitions to have a size that is greater than a second minimum size and less than or equal to a total size of the disk cache less a size of all other partitions combined;create a premigration queue configured to service premigration data for all of the one or more tape-managed partitions; andreceive a premigration delay value for a first tape-managed partition, the premigration delay value defining a time period that elapses prior to queuing the premigration data for first tape-managed partition to the premigration queue, wherein the premigration delay value is based on a volume creation time.