User manual

RAID-1 support
Cobalt Qube 3 User Manual 55
For incoming packets, IP Masquerading does the opposite. IP Masquerading
receives a packet from the Internet and translates the legal address of the
secondary interface into the private IP address on the internal network.
RAID-1 support
RAID-1 is available on the Qube 3 Professional Edition only.
A redundant array of independent disks (RAID) is a way of storing the same data
in different places (thus, redundantly) on multiple hard disks. A RAID appears to
the operating system to be a single logical hard disk.
There are a variety of different types and implementations of RAID, each with its
own advantages and disadvantages. The Qube 3 Professional Edition implements
RAID Level 1 (RAID-1), also known as disk mirroring, which consists of a
primary hard disk and a secondary hard disk; the secondary hard disk is an exact
copy or “mirror image” of the primary hard disk.
Although RAID can protect against disk failure, it does not protect against
operator and administrator (human) error, or loss due to system errors.
The Qube 3 configuration uses Software RAID, meaning that it implements
RAID in the software and requires no extra hardware.
You do not need to enable RAID-1 on the Qube 3; it is enabled by default. You
cannot disable RAID-1 on the Qube 3.