LUN CACHE method for FC-SAN memory system
A FC-SAN, storage system technology, applied in memory address/allocation/relocation and other directions
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example 1
[0107] First, the system starts and loads the LUN CACHE system.
[0108] 1. The user issues a read command M1. After the STML module receives the read command, it transmits the command M1 to the system through the interface sub-module.
[0109] 2. The system applies for a LUN read-write lock. The application successfully obtains a read-write lock, and then enters the buffer management sub-module.
[0110] 3. The buffer management submodule searches the buffer and finds that the buffer does not have the data required by M1.
[0111] 4. Release the LUN read-write lock and apply for an I / O read-write lock.
[0112] 5. The application for the I / O read-write lock fails and enters the waiting queue.
[0113] 6. After waiting for M1 to obtain the I / O read-write lock, transfer M1 to the underlying I / O subsystem through the interface function for actual I / O read-write lock.
[0114] 7. The underlying I / O subsystem returns the result data of M1 to the LUN CACHE system through the in...
example 2
[0118] First, the system starts and loads the LUN CACHE system.
[0119] 1. The user issues a write command M2. After receiving the write command, STML passes the command M2 to the system through the interface sub-module.
[0120] 2. The system applies for a LUN read-write lock, but the application is unsuccessful and waits.
[0121] 3. The shared lock submodule notifies M2 to obtain the LUN read-write lock.
[0122] 4. The buffer management submodule searches the buffer and finds that the buffer has the data required by M2.
[0123] 5. Write M2 data directly into the buffer. (execute command M2)
[0124] 6. Release the LUN read-write lock, and return the result of M2 to the STML module through the interface sub-module.
[0125] 7. The data synchronization sub-module regularly updates the buffer according to the least recently used algorithm.
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