Dell PowerVault 725N (Rackmount NAS Appliance) - Manual (Page 172)

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rebuilding. failed hard drive.
I replaced a failed hard drive with
another hard drive of the same capacity,
but it will not start its rebuilding process.
The NAS system may have been turned off
when you replaced the hard drive.
If the NAS system is turned off when a hard drive is replaced, the
rebuilding process must be manually started. See " Replacing One
Hardware-RAID NAS System Hard Drive " in the "Recovering and
Restoring the System" section of this guide.
I have several hard drive-related events
in the event logs.
BIOS version A06 or later may not be
installed.
Download the latest BIOS from support.dell.com. See " Updating the
BIOS " in the "Advanced Features" section of this guide for more
information.
I have several hard drive-related events
in the event logs, and my BIOS version is
correct.
A software RAID hard-drive carrier may be
installed in the hardware-RAID NAS
system.
Software RAID and hardware RAID hard-drive carriers operate
differently and are not interchangeable. Ensure that the hard-drive
carrier has a "HW-RAID" identification label on it.
I have several hard drive-related events
in the event logs, my BIOS version is
correct, and I am using correct hard-drive
carriers.
Incorrect RAID controller card firmware
may be installed.
Download the latest RAID controller card firmware from
support.dell.com.
I replaced my RAID controller card (or
hard-drives or RAID controller card cable),
and now I cannot boot or reinstall the
operating system.
The volume or boot configuration has
been deleted.
Recreate the virtual disks and then reinstall the operating system.
See " Recreating Virtual Disks " in the "Recovering and Restoring the
System" section of this guide.