IBM DS8880 Series, Introduction And Planning Manual

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Chapter 3. Data management features
The storage system is designed with many management features that allow you to
securely process and access your data according to your business needs, even if it
is 24 hours a day and 7 days a week.
This section contains information about the data management features in your
storage system. Use the information in this section to assist you in planning,
ordering licenses, and in the management of your storage system data
management features.
Transparent cloud tiering
Transparent cloud tiering is a licensed function that enables volume data to be
copied and transferred to cloud storage. DS8000 transparent cloud tiering is a
feature in conjunction with z/OS and DFSMShsm that provides server-less
movement of archive and backup data directly to an object storage solution.
Offloading the movement of the data from the host to the DS8000 unlocks
DFSMShsm efficiencies and saves z/OS CPU cycles.
DFSMShsm has been the leading z/OS data archive solution for over 30 years. Its
architecture is designed and optimized for tape, being the medium in which the
data is transferred and archived.
Due to this architectural design point, there are inherent inefficiencies that
consume host CPU cycles, including the following examples:
Movement of data through the host
All of the data must move from the disk through the host and out to the
tape device.
Dual Data Movement
DSS must read the data from the disk and then pass the data from DSS to
HSM, which then moves the data from the host to the tape.
16K block sizes
HSM separates the data within z/OS into small 16K blocks.
Recycle
When a tape is full, HSM must continually read the valid data from that
tape volume and write it to a new tape.
HSM inventory
Reorgs, audits, and backups of the HSM inventory via the OCDS.
Transparent cloud tiering resolves these inefficiencies by moving the data directly
from the DS8000 to the cloud object storage. This process eliminates the movement
of data through the host, dual data movement, and the small 16K block size
requirement. This process also eliminates recycle processing and the OCDS.
Transparent cloud tiering translates into significant savings in CPU utilization
within z/OS, specifically when you are using both DFSMShsm and transparent
cloud tiering.
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