Your LaCie 2big NAS features a robust RAID management system that will allow you to choose and manage the RAID mode most optimized for your data.
Rebuilding a protected RAID array takes many hours, depending on the capacity of the disks and your LaCie NAS's available resources (concurrent tasks such as backups or torrent downloads will slow rebuilding). Changing to an unprotected RAID mode (ie RAID 0) takes less than five minutes. Note that data is accessible during rebuilding.
Refer to the table below for an overview of the different RAID modes, and see the descriptions for details. Note that this information is also explained in the RAID Setup Wizard on the Dashboard (see above for details).
RAID 0: RAID 0 gives users the total capacity of both hard disks as well as excellent performance. However, RAID 0 offers no protection if a hard disk fails.
RAID 1: RAID 1 provides data safety since all data is written to each hard disk at the same time. In the event of a single hard disk failure, data remains available on the other hard 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 hard disk space by 50% due to the need to write each bit of data on each hard drive.
Unprotected RAID Arrays and Swapping/Expanding Hard Disks:
Protected RAID Arrays and Swapping/Expanding Hard Disks: If your array is protected (e.g. RAID 1), you can remove a hard disk while the product is turned on without damaging the array and losing data, a process also referred to as “hot-swapping”. In most instances, LaCie recommends hot-swapping when replacing or expanding hard disks in the LaCie NAS. For example, if you swap or insert unclean hard drives (with data) from another LaCie NAS (e.g. a LaCie 2big NAS to a LaCie 5big NAS Pro), you may experience problems when first booting your current LaCie NAS.
When replacing or expanding hard drives in a protected RAID array:
Replacing a hard drive involves two main steps, installing the new hard drive and claiming the new hard disk at Dashboard > RAID (see below). Note that the new hard disk must have equal or greater capacity than the hard disk it is replacing.
The Dashboard will become unavailable while the RAID mode is changed.
RAID 1 configurations allow you to expand the capacity of your LaCie 2big NAS without losing data. Please note that RAID 1 configurations optimize storage with two hard drives of the same capactiy.
Example: A RAID 1 array with data is comprised of two 1TB hard drives. The administrator wants to upgrade both hard drives to 3TB. To begin, the adminstrator removes the 1TB hard drive from Drive Tray 2. There is no need to power off the 2big NAS since RAID 1 supports hot-swapping. Per the instructions in Disk Removal, the administrator removes the 1TB hard drive from the disk tray and screws in the new 3TB hard drive. Once the the disk tray with the new 3TB hard drive is reinserted into the 2big NAS chassis, the administrator synchroonizes the RAID 1 array. The process is repeated for the second hard disk.