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A FC-SAN, storage system technology, applied in memory address/allocation/relocation and other directions
Inactive Publication Date: 2004-11-10
TSINGHUA UNIV
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[0002] In the field of data storage, compared with the improvement of CPU performance and memory capacity according to Moore's Law, as the main device of external storage - hard disk, the performance improvement is very limited due to the nature of mechanical movement.
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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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Abstract
The invention is an LUN CACHE method for an FC-SAN storage subsystem, and its character: it is implemented by a logic unit number cache (LUN CACHE) module operating in an embedded system of I/O processing nodes in the FC-SAN; it uses an improved CACHE displacement arithmetic to enhance the utilization ratio of CACHE, so as to complete the read-write operation in the I/O processing nodes by caching but not sending to a concrete SCSI device; uses a delayed write technique to update the data on the background, extremely improving the repose time; uses a mechanism of read-write lock to ensure a consistency of data sharing among multiple users; makes the LUN CACHE completely transparent for a user by the good design of interface devices. It is tested that the read-write operation performance is extremely enhanced by using the LUN CACHE than before.
Description
technical field [0001] The logical unit number cache LUN CACHE method of the FC-SAN storage system belongs to the field of storage technology in the fiber channel-storage area network Background technique [0002] In the field of data storage, compared with the improvement of CPU performance and memory capacity according to Moore's Law, as the main device of external storage - hard disk, the performance improvement is very limited due to the nature of mechanical movement. At the same time, the density of disk storage has increased by about 60% per year, which is even higher than the improvement rate of CPU and memory. In view of the continuous expansion of capacity and very limited speed increase, all disks currently have MB-level cache subsystems to improve disk performance. Studies have shown that on-disk cache can greatly improve the read and write performance of the disk. [0003] The LUN CACHE method we proposed is different from the previous technology. Instead of di...
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