About Background Tasks
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Initialization of RAID 1 and RAID 10 Units
RAID 1 and RAID 10 units do not need to be initialized when they are created
to be fault tolerant and are immediately available for use with full
performance when created.
Initialization of RAID 1, RAID 10 will take place automatically the first time
the unit is verified.
Initialization of a RAID 1 unit results in data from one disk (the disk on the
lower channel number) being copied to the other disk. In RAID 10 units, data
from one half of the unit is copied to the other half.
After the initialization, subsequent verifies to a RAID 1 or 10 unit check for
data consistency by comparing the data from one drive (or set of drives) to the
other drive (or set of drives).
Auto Initialization After Power Failure
The 3ware controller detects and handles power failures. This mechanism is
intended to ensure that redundant units have consistent data and parity. When
a redundant unit is unexpectedly shutdown, there is a possibility some data
and parity may be inconsistent. For redundant units, if a unit or sub-unit is
Table 10: Initialization Requirements for Different RAID
Configurations
Initialization Required
for Highest
Performance?
RAID Configurations
No Single drive or hot spare
No RAID 0 or RAID 1
No RAID 1
RAID 10
No RAID 5 with 3 or 4 disks
RAID 50 with 6, 8, or 9 disks
RAID 50 with 12 disks in 3 subunits of 4
RAID 50 with 12 disks in 4 subunits of 3
RAID 50 with 16 disks in 4 subunits of 4
Yes RAID 5 with 5 or more disks
RAID 50 with 10 disks in 2 subunits of 5
RAID 50 with 12 disks in 2 subunits of 6
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