SAN Volume Controller: Best Practices and Performance Guidelines

Chapter 9.3.1. Steps to making a FlashCopy VDisk with application data integrity

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148 SAN Volume Controller: Best Practices and Performance Guidelines 2. The application sends the data to a file. The file system accepting the data might buffer it in memory for a period of time. 3. The file system will send the I/ O to a disk controller after a defined period of time ( or even based on an event). 4. The disk controller might cache its write in memory before sending the data onto the physical drive. If the SVC is the disk controller, it will store the write in its internal cache before then sending the I/ O onto the real disk controller. 5. The data is stored on the drive. At any point in time, there might be any number of unwritten blocks ...