Appliedz/OS31 min
Storage management (DFSMS)
How z/OS decides where data lives and how it is looked after: DFSMS components, SMS classes and ACS routines, DFSMShsm migration and backup, tape and virtual tape, copy services, and the space problems you will meet in production.
What you will be able to do
- Explain the DFSMS components and the four SMS constructs, and how ACS routines assign them
- Describe DFSMShsm migration levels, recall, backup and the daily space management cycles
- Explain virtual tape, tape management and copy services such as FlashCopy and Metro Mirror at concept level
- Triage common storage incidents such as x37 abends, full storage groups and slow recalls
Lessons
- DFSMS components and SMS constructsDFSMS is the family of z/OS components that decides where datasets live, how long they are kept and how they are backed up. The Storage Management Subsystem (SMS) applies site…
- DFSMShsm, tape and virtual tapeDFSMShsm keeps disk from filling up by moving unused data to cheaper levels and bringing it back automatically when someone needs it. It also takes backups. Tape, now mostly…
- Copy services, storage problems and the storage roleModern disk subsystems can copy and mirror data in hardware, which underpins fast backups and disaster recovery. Most day-to-day storage incidents are about space, recall delays…
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