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ESS FlashCopy creates a clone of the source system onto a second set of disk drives which are then attached and used by another system or LPAR partition. BRMS provides a mechanism to perform a backup on the second system such that it appears to have been done on the original system.
How it works:
On the primary system:
- Prepare BRMS for FlashCopy
- Quiesce system (PWRDWNSYS) to ensure all main storage content is written to disk.
- Issue the FlashCopy
- Restart the primary system
- Stop all BRMS activity on the primary system
On the secondary system:
- Change system attributes and network configuration during manual IPL
- Set BRMS system state to FlashCopy mode
- Secondary system is treated as the primary system in the BRMS network
- Complete saves using BRMS
- Set BRMS state to FlashCopy backup complete mode
- Save QUSRBRM and transfer it to the primary system
Back on the primary system:
- Call post FlashCopy BRMS function and restore QUSRBRM
- Resume BRMS activities on the primary system
More information can be found in the ITSO Redbook;
iSeries & TotalStorage: A Guide to Implementing External Disk on IBM eServer i5; SG24-7120: (Using BRMS and Flashcopy
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