Lacie 4big Quadra White Paper - Page 11

LaCie RAID Technology White Paper RAID 0 RAID 1 RAID 3 RAID 3+Spare RAID 5 RAID 5+Spare RAID 6 RAID 0+1 RAID 10 Concatenation JBOD RAID Selection Other Configurations Concatenation When disks are concatenated, their capacities are combined and data is written to the primary disk in the array until is it full and then to successive disks. Concatenation provides no performance advantage or added measure of data safety. It is simply a method of combining two physical disks into one volume for greater overall capacity. Concatenation allows full use of the capacity of all disks in the array and most data can survive a disk failure. Only data on the failed disk and data that is partially written on the failed disk and an operative disk is lost. LaCie Products with Concatenation Mode ✦✦ LaCie 2big network ✦✦ LaCie Ethernet Disk ✦✦ LaCie 2big quadra ✦✦ LaCie 4big quadra How Concatenation Capacity Is Calculated Storage capacity in a concatenation configuration is calculated by multiplying the number of drives by the disk capacity, or C = n*d where: C = available capacity n = number of disks d = disk capacity For example, in a concatenation array with four drives each with a capacity of 1000GB, the total capacity of the array would be 4000GB: C = (4*1000) Concatenation A B C D Disk 1 E F G H Disk 2 I J K L Disk 3 M N O P Disk 4 Page 11