9.29. I/O Path - Delayed Allocation

9.29. I/O Path - Delayed Allocation

Initial write reserves space only

Must ensure that when write to disk occurs there is space available

Allocation of real extents occurs when data is actually being written

Data can be coalesced into much larger I/Os to disk
Allows allocator to allocate much larger extents than just individual I/O request sizes from the application

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