Linux 拷贝大文件 sync
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man sync
On Linux, sync is only guaranteed to schele the dirty blocks for writing; it can actually take a short time before all the blocks are
finally written. The reboot(8) and halt(8) commands take this into account by sleeping for a few seconds after calling sync(2)
但是你调用了reboot，理论上还是会等缓存写入磁盘的啊
