LaCie 2BIG NAS User Manual page 269

RAID 1+Spare(s), RAID 5+Spare(s), and RAID 6+Spare
RAID Mode Maximum Spare Drives
RAID 1 3
RAID 5 2
RAID 6 1
In a RAID 1 configuration, the same data is written across all hard disks in the volume, protecting your data
against the loss of one disk. With RAID 5 and RAID 6, data is available from the parity blocks and protected
should one or two drives fail, respectively. A RAID+Spare volume gives you a "hot-spare" that is ready to
synchronize data immediately should a disk fail. If a hard disk in the volume fails, the data starts to synchronize
with the spare. The clear advantage for a RAID volume with a spare is that you do not have to wait for a
replacement disk.
When the failed disk is replaced, the replacement disk becomes the new hot spare.
To create a volume with a spare hard drive, you must choose Custom in the New volume wizard. Selecting
Quick setup in the New volume wizard will automatically configure a volume with LaCie SimplyRAID and single
disk protection. SimplyRAID optimizes disk space across all hard drives to maximize data storage. Therefore, it
does not include the option to add a spare drive. See
volumes with the New volume wizard.
Important info: For RAID+Spare volumes, data remains intact when a single disk fails and the spare begins
synchronizing automatically. If a second disk in the volume fails before synchronization is complete, all data
in the volume will be lost.
LaCie 2big NAS | LaCie 5big NAS Pro User Manual
New Storage Volume Wizard for instructions on creating
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