Hotswap 和 Hotplug 的区别
Hot Swap means that you can remove the drive and replace it with another drive without significant interruption to the system.
Hot Plug typically means that you can add a new disk without removing power, but you can not remove the disk without stopping any activity on this device. In other words the device needs to be in a "quiet state" before it is removed.
Both Hot Swap and Hot Plug devices can be removed and installed without removing power. However it is important not to interpret Hot Plug as having Hot Swap capability.
Hotswap是指可以在线操作，但是不会影响系统
Hotplug会在某种程度上中断部分系统功能
列举Hotplug和HotSwap的设备:
Hotplug：Cell Board、PCI Card、Internal HDD
Hotswap：fans、Power supply
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