Which of the following command can check kernel version information in linux system?

When add LUN from S5000T configured asynchronous remote replication, Set the type to " timer wait begin at the same time " Timing length is 720 minutes " Assuming 10:00 start synchronization, Synchronization process takes 100 minutes, so what is the time for the start of the next synchronization?

Writethrough strategy of S5000T system is first write to the cache before write each IO request, mean write successful after written to disk.write back strategy is write each IO request to the cache mean write successful, so the performance of write back strategy is better than writethrough strategy.But write back strategy, exists the risk of loss cache data in system abormal power down.