Auto Initialization After Power Failure - 3Ware 9550SXU-16ML User Manual

Serial ata raid controller
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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).
Table 9: Initialization Requirements for Different RAID
Configurations
Initialization Required
for Highest
Performance?

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
detected to have been shutdown uncleanly, the unit or sub-unit will change its
mode to either 'Initializing' or 'Verifying'.
3ware's auto-initialization feature determines if this is required. During driver
startup, a flag is set that indicates that the driver loaded. Upon an orderly
shutdown, the flag is rewritten, indicating that there was a clean shutdown.
During the next system power cycle the firmware queries the flag. If there was
a power failure, the flag will indicate that there was not a clean shutdown.
This means that the data on the drives may not be correct.
www.3ware.com
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
About Background Tasks
171

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