Dell PowerVault 725N (Rackmount NAS Appliance) - Manual (Page 117)

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 " Software-RAID NAS System Hard-Drive Failures " in this section of the guide.
Software-RAID NAS System Hard-Drive Failures
Your software-RAID NAS system has a mirror of the operating system on hard drives, which allows you to recover in most cases. Depending on which drive
fails, use one of the procedures in
Table 5 -1 to recover from a hard-drive failure.
Table 5-1. Software-RAID NAS System Hard-Drive Recovery Procedures
Software-RAID NAS System Software Failures
To recover from the following software failures, use one of the following procedures:
l If the main operating system files are missing or corrupt, you must manually boot from the recovery operating system mirror hard drives 2 and 3. For
instructions, see " Booting From the Software-RAID NAS System Recovery Operating System Mirror Hard Drives " in this section of the guide.
l If the main operating system mirrored partition fails, you must manually boot from the recovery operating system mirror hard drives 2 and 3 and restore
the original files to the main operating system hard drives 0 and 1. See " Replacing Software-RAID NAS System Hard Drive 0 " in this section of the guide.
After the system is running, you can boot the system back to the main operating system hard drives and then perform a system-state restore operation.
See "
Restoring System-State Data After Reinstallation " in this section of the guide.
Replacing Software-RAID NAS System Hard Drives
This section provides the procedures for replacing hard drive 0, hard drives 1, 2, or 3, re-establishing the recovery operating system partitions, and booting
from the recovery operating system mirror hard drives.
Replacing Software-RAID NAS System Hard Drive 0
1. Shut down the system.
2. Remove the front bezel.
3. Remove failed hard drive 0 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 Replace the failed hard drive. See " Replacing Software-RAID NAS System Hard Drive 0 " in this section of the guide.
Hard drive 1, 2, or 3 Replace the failed hard drive. See " Replacing Software-RAID NAS System Hard Drive 1, 2, or 3 " in this section of the guide.
Two or more hard
drives fail
Replace the failed hard drives, and then follow the procedures in " Recovering From a Software-RAID Operating System Failure " 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.