IBM OS/390 User Manual
For more information on the benefits of system-managed storage, refer to the
following publications:
following publications:
DFSMS/MVS General Information, GC26-4900
Implementing System-Managed Storage, SC26-3123
DFSMS/MVS Planning for Installation, SC26-4919
RACF General Information, GC23-3723
Getting Started with DFSORT, SC26-4109
Implementing System-Managed Storage, SC26-3123
DFSMS/MVS Planning for Installation, SC26-4919
RACF General Information, GC23-3723
Getting Started with DFSORT, SC26-4109
5.3.4 Implementing DFSMS
Implementation of DFSMS is not required for OS/390, but many of the newer
functions available with OS/390 and DFSMS/MVS require system-managed data
and the associated activation of the Storage Management Subsystem (SMS)
address space. The following is a small sampling of some of the functions
requiring data that is system-managed:
functions available with OS/390 and DFSMS/MVS require system-managed data
and the associated activation of the Storage Management Subsystem (SMS)
address space. The following is a small sampling of some of the functions
requiring data that is system-managed:
•
Allocation of OpenEdition Hierarchical File System (HFS) data sets.
•
Allocation of Extended Format data sets which provides:
−
VSAM System-Managed-Buffering (SMB)
−
VSAM Extended Addressability
−
VSAM Compression
−
SAM Tailored Compression
•
Reduction of out-of-space failures
•
VSAM Record Level Sharing (RLS)
A complete list of new functions available with DFSMS/MVS and considerations
for implementing them can be found in
for implementing them can be found in
DFSMS/MVS Planning for Installation,
SC26-4919.
DFSMS implementation can be a phased migration using a milestone approach.
The five major milestones are:
The five major milestones are:
1. Enabling the software base
2. Activating the storage management subsystem
3. Managing temporary data
4. Managing permanent data
5. Managing tape data
Using the milestone approach allows you to begin with low-risk implementation
activities that establish a base for the staged migration of your data to storage
management. In later milestones, your early experience is used to achieve
greater data and storage automation. The milestone process is documented in
Implementing System-Managed Storage, SC26-3123. Please refer to the
publication for more detail.
activities that establish a base for the staged migration of your data to storage
management. In later milestones, your early experience is used to achieve
greater data and storage automation. The milestone process is documented in
Implementing System-Managed Storage, SC26-3123. Please refer to the
publication for more detail.
In conjunction with the milestone approach to implement DFSMS, you can use
the DFSMS Fast Implementation Technique (FIT) to plan the implementation.
DFSMS FIT uses a question-and-answer approach to create a DFSMS design
tailored to your installation
the DFSMS Fast Implementation Technique (FIT) to plan the implementation.
DFSMS FIT uses a question-and-answer approach to create a DFSMS design
tailored to your installation
′
s needs, and a data classification system that allows
you to use your data set naming standards already in place. It helps you quickly
identify the different types of data to which you want to assign specific
data-set-level, SMS-management policies.
identify the different types of data to which you want to assign specific
data-set-level, SMS-management policies.
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