Rebuilding Times; About Raid Modes - LaCie 2BIG User Manual

Rebuilding Times

Rebuilding a protected RAID array takes many hours, depending on the capacity of the disks and your NAS'
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 a minute. Note that data is accessible during rebuilding.

ABOUT RAID MODES

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 Mode Capacity Protection Factory Default
RAID 0 100%
RAID 1 50%
RAID 0: 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 RAID 0 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.
RAID 1: 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.
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