RAID5-orientated optimal design method for writing operation in continuous data storage
A technology of data storage and optimized design, applied in the direction of input/output to record carrier, etc., can solve the problems of low random I/O transmission performance and reduce RAID5 throughput, so as to improve throughput, avoid seek overhead, and reduce I/O. The effect of /O overhead
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[0069] Such as Figure 4 As shown, assume that there are 2 channels of video monitoring applications, the size of the write data block sent each time is 4KB, and the RAID 5 stripe length fullstripelen=10KB (5 data disks, 1 check disk, and the size of each data block is 2KB) , the sending buffers of the 0th road and the 1st road data are bufsend[0] and bufsend[1] respectively, the initial variable residual[0]=residual[1]=fullstripelen=10KB, offsend[0]=0, offsend[ 1] = fullstripelen.
[0070] The receiving thread receives 6 write requests from the application program, which come from the 0th and 1st video monitoring channels respectively, see Figure 4 (a), put it into the queue Q. The sending thread dispatches write requests to bufsend[0] and bufsend[1], see Figure 4 (b).
[0071] The sending thread performs the following operations, see Figure 4 (c). For each way of data, the data blocks of the first two write requests are copied into the buffer, and the first 2KB of t...
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