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LaCie 2big NAS (OS 3.0) | LaCie 5big NAS Pro User Manual 153
Rebuilding Times
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.
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% YES
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.
Caution: If one physical hard disk in a RAID 0 array fails, the data of all hard disks becomes inaccessible
because parts of the data have been written to all hard disks.
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.