Description of the problem

The recovery time for restoring work after power down and rebooting is different for the two cross-boards, GXCS and SXCS, of the Huawei OSN3500 device, which are about 3 minutes for GXCS and about 8 minutes for SXCS.

Processing

Explain it from two points:

1. the size of the crossover matrix array due to the crossover capacity.

2. the dynamic crossover bus rate.

No. 1, Huawei OSN3500 device GXCSA as a 40G high-order and 5G low-order cross board, and SXCSB as a 240G high-order and 20G low-order cross board, in the preservation space of the cross matrix SXCSB high-order is 6 times that of the GXCSA, and SXCSB low-order is 4 times that of the GXCSA, and if the preservation of cross matrices to the preservation memory needs to be preserved two copies (mfs and ofs1), then the saving space SXCSB high order is 12 times of GXCSA and SXCSB low order is 8 times of GXCSA. Therefore, the amount of data is large, the recovery is slow, and after power-down startup, when the cross-matrix is recovered, the process of CRC checking of the configuration file, reading of the high-order and low-order cross-matrices, correctness checking, recovering to the memory, and writing to the chip registers all take many times longer than the time spent on GXCSA. This calculation shows that the average time to restore the configuration SXCSB is 2.5 times longer than that of GXCSA.

Second, the cross chip used in GXCSA is a fixed bus rate, while the cross chip used in SXCSB is a dynamic bus rate, so it is necessary to set the corresponding bus rate of the slot to 622M or 2.5G according to the service veneer inserted in each slot.

Therefore, after power down, SXCSB needs to wait for the main control board to send down the bus rate of each slot, while GXCSA has a fixed bus rate and does not need to wait for the main control to send down the bus rate, which also affects the recovery time of SXCSB's power down service.

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