d2, 2big, and 5big Network 2 User Manual 110
RAID0 (2big and 5big): RAID 0 (also called Spanning mode in some LaCie devices), is the fastest RAID mode.
In a RAID 0 array, the available capacities of each disk are added together so that one logical volume mounts on
the computer. It offers the best performance but no protection in the case that a disk fails.
Caution: In a RAID0 array, if one physical disk in the array fails, the data of all disks becomes inaccessible
because parts of the data have been written to all disks.
2big 5big
RAID1 (2big and 5big [only if two disks are installed]): RAID 1 is a secure RAID mode that is available if
the 5big Network 2 has only two disks installed. RAID 1 provides data safety since all data is written to each disk
at the same time. In the event of a single disk failure, data remains available on the other disk. Due to the time
it takes to write the data twice, performance is slightly reduced. RAID 1 is a good choice when safety is more
important than speed. However RAID 1 also reduces the available disk space by 50% due to the need to write
each bit of data on each hard drive.
RAID5 (5big only): In RAID 5, data is striped across all disks (minimum of three) and a parity block for each
data block (P in the illustration below) is written on the same stripe. If one physical disk fails, the data from the
failed disk can be rebuilt onto a replacement disk. No data is lost in the case of a single disk failure, but if a
second disk fails before data can be rebuilt to a replacement drive, all data in the array will be lost.
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