QNAP Security VioStor CMS (Version: 1.0.1) - Manual (Page 175)

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The CMS Server supports HDD hot swapping. When a hard drive of a RAID configuration
fails, the failed hard drive can be replaced by a new one immediately without shutting down
the server, and the recording data can still be retained. However, if the hard drives are
working properly and the recording is in process, do not swap the hard drives to avoid
damages to the hard drives or the recording files.
Warning: It is strongly recommended to turn OFF the server before replacing the
hard drives to reduce the risk of electric shock. The system should only be managed and
maintained by authorized system administrators.