Avastor XD5 User Manual - Page 17

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Clear RAID (Non-RAID)

Clear RAID - also known as JBOD (Just a Bunch of Drives) refers to a group of

hard drives. In CLEAR RAID, the number of logical drives is equal to the number

of physical drives. This mode allows the XD5 to operate as a multi-drive storage

enclosure, but provides no data redundancy. Each drive will be shown as a

separate drive up to 5 drives. If one drive fails, the others are not affected.

Parity data is used by some RAID levels to achieve redundancy. If a drive in the array fails,

remaining data on the other drives can be combined with the parity data (using the Boolean XOR

function) to reconstruct the missing data. Parity data, quite simply, is the result of a quick

equation. Here's a simple way to think of parity: 6 + 3 = 9

Imagine the 6 is on one hard drive, the 3 on another, and the 9 on a third. The 3 and the 6 are

your data, but the 9 is the result of a simple equation. If a hard drive was to fail, and you lost for

example, the 3, you could do a simple calculation to retrieve the 3 (9 minus 6).

FAQ

How do I choose the proper RAID configuration for my XD5 based on the

tasks I need to perform?

The XD5's selectable RAID configuration settings can help you administer how

the XD5 handles stored data. It is recommended you choose the RAID

configuration that is most applicable to your task. The most common factors

affecting the choice of which RAID mode to choose are capacity, speed, and data

protection. For example, if you are using the XD5 to store entertainment media

or for backup, RAID 5 mode can be used; it offers the combined capacity of the

multiple drives while writing to one drive at a time. If your work requires

continuous backup of the data and redundancy, then RAID 10 would be the best

choice, however capacity is reduced to the capacity of the 2 smallest drives. If

you need the faster data access, then the enhanced speed of RAID 0, which

combines the drives for maximum capacity and writes data simultaneously to the

drives, may be the most appropriate.

Because there are two FireWire ports on the XD5, I connected them to two

external devices. Why can't I see these additional external devices on my host?

I'm using the USB connection from the XD5 to my computer.

In order for the XD5 to work properly, one of the FireWire ports needs to be

connected to the computer, and the other one can be connected to an external

device. The XD5 should only be connected to a host computer via one type of

interface cable. Connecting the XD5 to a computer simultaneously via two or

more interface cables is not recommended and can cause data loss. More

instruction on daisy chaining FireWire devices can be found at Avastor on You

Tube.

http://www.youtube.com/watch?v=FVA6rzaOVqI&tracker=False

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