Dell PowerVault 725N (Rackmount NAS Appliance) - Manual (Page 120)

l Are the link LEDs on the back of the NAS system and any network switches to which it may be connected illuminated?
Ensure that the Ethernet cable is securely connected to the NAS system and a functioning Ethernet jack.
l Are you using a standard Ethernet cable to connect to the network?
Do not use a crossover cable.
l Have you allowed enough time for the NAS system to boot?
The NAS system typically takes several minutes to boot.
l Does the NAS system boot completely?
Connect a keyboard, mouse, and monitor to the NAS system, and observe the boot process.
l Are the LEDs for all four hard drives on the NAS system lit?
If the LEDs are not all lit, you may have a failed hard drive. See " Hardware-RAID NAS System Hard-Drive Failures " in this section of the guide.
Hardware-RAID NAS System Hard-Drive Failures
Your hardware-RAID NAS system uses RAID 5 parity-redundancy functions to recover the operating system and data in most cases. Depending on how many
drives fail, use one of the procedures in
Table 5 -2 to recover from a hard-drive failure.
Table 5-2. Hardware-RAID NAS System Hard-Drive Recovery Procedures
Hardware-RAID NAS System Software Failures
Reinstalling the operating system on a hardware-RAID NAS system does not delete the data volume; therefore, a data recovery partition, which is available on
a software-RAID NAS system, is not necessary. RAID 5 redundancy protection is provided by its ability to recover data through parity matching. Therefore, if
the operating system files are missing or corrupt, the operating system must be reinstalled. See "
Recovering From a Hardware-RAID Operating System Failure "
in this section of the guide.
Replacing Hardware-RAID NAS System Hard Drives
This section provides procedures for replacing hard drives 0, 1, 2, or 3. If a single hard-drive failed, see " Replacing One Hardware-RAID NAS System Hard
Drive " in this section of the guide. If two or more hard drives failed, see " Replacing Two or More Hardware-RAID NAS System Hard Drives " in this section of the
guide.
Replacing One Hardware-RAID NAS System Hard Drive
1. Remove the front bezel.
2. Remove the failed hard drive from the NAS system.
NOTICE: The software RAID and hardware RAID hard-drive carriers operate differently and are not interchangeable between the two types of NAS
systems. The hardware RAID hard-drive carriers have a "HW-RAID" identification label and the software RAID hard-drive carriers have a "SW-RAID"
identification label.
Hard Drive That Failed Necessary Action
Hard drive 0, 1, 2, or 3 Replace the failed hard drive. See " Replacing One Hardware-RAID NAS System Hard Drive " in this section of the guide.
Two or more hard drives
fail
Replace the failed hard drives. See " Replacing Two or More Hardware-RAID NAS System Hard Drives " in this section of the
guide.
NOTICE: The software RAID and hardware RAID hard-drive carriers operate differently and are not interchangeable between the two types of NAS
systems. The hardware RAID hard-drive carriers have a "HW-RAID" identification label and the software RAID hard-drive carriers have a "SW-RAID"
identification label.