DOC0003192. Rev 03
41 / 79
06 July, 2009
Section 4: Disks
4.1 Management
JBOD:
JBOD is a way to use the maximum capacity of both disks. In JBOD your
BOSSNAS122
is
configured as follows: the first disk formatted will be the primary disk; the second
disk formatted will be the secondary disk. The secondary disk is located within the
primary disk. JBOD offers no redundancy and, if any one disk fails, the data on that
disk will be lost. The capacity in this array is the total of both disks
RAID 0:
RAID 0 (striped disks) distributes data across both disks in a way which gives
improved speed and full capacity. Raid 0 offers no redundancy and, if any one disk
fails, the entire array cannot be used and all data on both disks will be lost. The total
capacity is 2x the smallest disk in the array
RAID 1:
RAID 1 (mirrored disks); copies exactly the data on disk one to disk two. In this
array, if one disk fails data is not lost. Replacing the failing disk with a disk of the
same capacity (or larger), invokes an automatic rebuild from the remaining disk (hot
swap). The total capacity of the array is the capacity of the smallest disk in the array
RAID 1 Hot Swap
There is no need to switch off your
BOSSNAS122
device when replacing a failing disk
1.
Press the HDD release button of the failing disk and remove the HDD
assembly
2.
Replace the failing disk with a new disk of same capacity or larger (new disk
must be initialized)
3.
The new disk will automatically rebuild (copying all data from the remaining
good disk to the new HDD)
4.
The progress of the rebuild can be seen via the GUI under System, Devices
5.
BOSSNAS122
device can be used as normal, while rebuild is in progress
RAID Linear:
RAID Linear is a simple grouping of both disks to create a larger virtual drive.
In RAID Linear, the data is allocated sequentially from one disk to the next (when
the first disk is full, data will then be allocated to the second disk). This grouping
provides no performance benefit. RAID Linear also offers no redundancy and, if any
one disk fails, the entire array cannot be used. The capacity in this array is the total
of both disks.