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Page 81 / 88 Scroll up to view Page 76 - 80
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D-Link DNS-722-4/DNS-726-4 User Manual
Section 4 - Troubleshooting
Troubleshooting
Check the System Status LED
The system status LED reports the condition of the enclosure fan and power supply:
Solid Blue: NVR is functioning normally
Blinking Blue: NVR is shutting down
If your unit is configured to work with a UPS, it will continue to run for a while after a power supply failure.
Check Disk Status LEDs
The disk status LEDs report the condition of the disk drives:
These lights will be solid BLUE when drives are connected but inactive.
The lights will blink when the drives are being accessed, formatted or synchronized.
They will illuminate AMBER if a drive has failed.
Replace a Failed Disk Drive
If a disk drive fails, the Disk Status LED will turn amber. If the disk drive belongs to a RAID Volume, the Volume will
go Critical or Offline.
Replace the failed disk drive with a new disk drive of the same or slightly greater capacity. Please make sure you have
powered down the unit.
Step 1: Open the unit’s front cover.
Step 2: Pull out the failed disk drive.
Step 3: Install a new disk drive into the slot.
If the failed drive belonged to a RAID Volume, the RAID Volume will begin rebuilding as soon as the new drive is
installed. During the rebuild, the Disk Status LED will blink. If the replacement drive is free, i.e. not assigned to a RAID
Volume or as a spare, the Disk Status LED remains dark after you install the new drive.
Check RAID Volume Status
Click the Status -> Device Info tab from the menu.
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D-Link DNS-722-4/DNS-726-4 User Manual
Section 4 - Troubleshooting
Respond to a Critical RAID Volume
How the unit responds to a critical RAID Volume depends on the RAID level of your Volume and whether you have a
spare drive available:
For
RAID 1
Volumes, if a spare drive is available, the RAID Volume will begin rebuilding itself automatically.
For
RAID 1
Volumes, when no spare drive is available, you must replace the failed disk drive. The RAID Volume will begin rebuilding itself when you install the new
disk drive.
RAID 0
Volumes go offline after a disk drive failure. A
RAID 0
volume cannot be rebuilt. All data on the volume will be lost.
Check Enclosure Status
Step 1: Click
System/Device Info
button from the main menu.
Step 2: If CPU temperature is above specification:
Be sure there is adequate air flow around the device.
Be sure that the ambient temperature is below 35°C (95°F).
Step 3: Check the fan speed.
If the fan speed is below 1800 RPM, contact Technical Support.
If any power status item is out-of-specification, contact Technical Support.
Restore the Default Administrator’s Password
If you forget the password, you can reset the password for “admin” to the default password:
<empty>.
Press and hold the
reset button for 5 seconds until the Power LED flashes three times. The Administrator password will now be blank.
Caution
When you reset or recover your unit, sometimes it will cause data corruption. Backup your recorded data before
resetting your unit.
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D-Link DNS-722-4/DNS-726-4 User Manual
Section 4 - Troubleshooting
Install ActiveX
If you cannot see the complete page of the system when using Internet Explorer, the ActiveX installation process may
not be complete.
Step 1: Click the
Live View/Playback
button on the top right.
Step 2: The browser will ask whether to install ActiveX.
Step 3: Click the upper bar to begin the installation process.
Step 4: Click the
Install
button to complete the process.
Upgrade Process When Applying Windows Vista
Windows Vista limits the authority of some users, which cause the system to reject a connection through Windows
Explorer. In this condition, you must change the settings of Vista first.
Step 1: Go to Start -> Control Panel.
Step 2: Select Administrative Tools.
Step 3: Select Local Security Policy/Security Options.
Step 4: Select “Network security: LAN Manager authentication level”.
Step 5: From the drop-down menu, choose “Send LM & HTLM – use NTLMv2 session security if negotiated”.
Step 6: Click the
OK
button.
Cannot Playback When Applying Windows 2000
1. Check whether Windows Media Player is installed.
2. If Media Player is installed, verify that it is version 9 or later.
Cannot Login to the Unit through Internet Explorer
1. Check the settings of your anti-virus software.
2. Adjust the settings of or disable anti-virus software.
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D-Link DNS-722-4/DNS-726-4 User Manual
Appendix A - Choose a RAID Level
Choose a RAID Level
There are several issues to consider when choosing the RAID level. The following summarizes some
advantages, disadvantages and applications for each choice.
RAID 0
Advantage
Implements a striped disk RAID Volume, the data is broken down into blocks and each block is
written to a separate disk drive
I/O performance is greatly improved by spreading the I/O load across many channels and drives
No parity calculation overhead is involved
Disadvantage
Not a true RAID because it is not fault tolerant
The failure of just one drive will result in all data in an RAID Volume being lost
Should not be used in mission critical environments
RAID 1
Advantage
Simplest RAID storage subsystem design
Can increase read performance by processing data requests in parallel since the same data resides
on two different drives
Disadvantage
Very high disk overhead - uses only 50% of total capacity
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D-Link DNS-722-4/DNS-726-4 User Manual
Appendix B - Replacing or Adding a new Hard Drive
Replacing or Adding a New Hard Drive
It is recommended that you backup your important files before replacing or adding a new hard drive to the NVR.
Replacing a Hard Drive:
Please make sure the power is off before replacing a hard drive. After you have installed the new drive, turn on the
NVR and then connect to the Web UI. The NVR will prompt you to format the new drive (Standard, RAID 1 mode) or
both drives (JBOD, RAID 0 mode).
Adding a New Hard Drive:
The NVR is able to work with one single hard drive under Standard mode. Please make sure the power is off before
installing a second hard drive.
After you have installed the new drive, turn on the NVR and then connect to the Web UI. The NVR will prompt you to
format the new drive.
Note:
Formatting a hard drive will erase the data stored on the hard drive. Please backup important data before
formatting a hard drive.

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