QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 230)

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7.2 Power Outage or Abnormal Shutdown
In case of power outage or improper shutdown of the server, the server will resume to the
state before it is shut down. If the server does not function properly after the restart,
please do the following:
1. If the system configuration were lost, configure the system again.
2. If the problem persists, contact the technical support.
7.3 Hot Swapping Hard Disk Drives (RAID Configuration)
This function is not supported by the one-bay NVR models.
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 be
reserved. However, if the hard drives are working properly and the recording is in process,
do not hot swap the hard drives to avoid damage to the hard drives or to the recording files.
Warning: It is strongly recommended to turn OFF the server before replacing the hard
drive to reduce the risk of electric shock. The server should only be maintained by an
authorized and trained technician.