LSI 3ware SAS 9750-8i Guide de l'utilisateur télécharger pdf (Page 166)

Maintaining Units

154 3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.0

grouping of 5 or more disks in a subunit do need to be initialized for full

performance.

Initialization of RAID 1 and RAID 10 Units

RAID 1 and RAID 10 units do not need to be initialized when they are

created. They are fault tolerant and are immediately available for use with full

performance when created.

Initialization of RAID 1 or RAID 10 units 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 port 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 RAID 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).

Notes:

For RAID 5 and RAID 6 with more 5 or more drives, it is strongly required that you

initialize the unit. Initialization is critical to insuring data integrity on the unit. The

initialization can be a background or foreground initialization.

For RAID 5 with 3 or 4 drives, initialization before use is not required. However,

initialization is required before a unit can be verified. Consequently, if you attempt to

verify a RAID 5 with 3 or 4 drives that has not yet been initialized, you will see a

message that the array has not been initialized, and initialization will begin. This is

considered part of the normal operation of the unit.

Table 12: Initialization Requirements for Different RAID

Configurations

Initialization Required

for Highest

Performance?

RAID Configurations

No Single drive

No RAID 0

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

1 2 ... 161 162 163 164 165 166 167 168 169 170 171 ... 341 342

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LSI 3ware SAS 9750-8i Guide de l'utilisateur Page 166

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