TECH018 - QVIS HardDrive Recovery
PDF outlining Step By Step guide to "RECOVER" or "FORMAT" QVIS iSeries DVR HardDrive when in hibernation mode after unscheduled power interruption , using the Web Interface to connect to the DVR
Lately there has been a noticeable marked increase in the reported failure of DVR hard-drives, this making up over 75% of the warranty returns. After additional investigation , we have found in most cases customers are not following the correct procedures in powering down their DVR’s.The DVR must be treated same as you would treat a PC, where as you would always correctly power down your PC & generally inform it to “SHUTDOWN”, so it can cleanly cease reading/writing to its HardDrive ensuring there is no file corruption. The same action must be carried out when removing power to your DVR , this being even more important due to the DVR constantly recording to the hard-drive, making them more likely to suffer corruption or damage if power is removed without warning . You will find in most modern DVR’s a menu option to correctly shutdown the unit OR on some other units, it requires the POWER button to held down for a pre-defined time to cause a clean shutdown. Additional feature of the QVIS iSeries / Dahua DVRs is they already come with hibernation software installed to help protect the HardDrive when power is removed without warning, in certain situations this will put the HardDrive into hibernation mode. When the DVR is powered backup, it then requires physical intervention to recover the HardDrive from hibernation. Also you will find most DVRs will provide different options for notifying the user of HardDrive/ Storage faults, this could be ALARM/MESSAGE alert on any connected monitor /screen or Audible Buzzer alarm. In the more advanced units, it will forward email notification of alarm conditions. Not all DVRs support email notification, so depending on the location of the DVR, i.e if it is located where the Buzzer would not be easily heard, it might be worth making sure your DVR supports email notification of hardware faults, or you might find when you need to look back at important incident, the DVR hasn’t been recording. It is also worth setting up email alarm alerts for disk errors, giving the user notification that their DVR is not recording. Also in sites where it is important for the DVR to be always recording, we would recommend purchasing a DVR with multiple HardDrive bays, and spread the storage requirements across at least 2 x HardDrives, to provide additional redundancy & backup incase there is an issue with one of the HardDrives. So instead of purchasing a single 2TB HardDrive, the better option might be 2 x 1TB HardDrives, if the DVR will support installation of 2 x HardDrives.
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