Intel SRCS14L - RAID Controller User Manual page 26

Intel® Integrated RAID Controller SRCS14L
This is the simplest method. The user just creates a new host drive from available physical disk
drives that are connected to the RAID controller (the assumption here is that there were disk drives
that were already connected but unused or there were new disk drives inserted into open slots in a
hot plug drive enclosure already connected to the RAID controller)
Creating new capacity to existing RAID array components (Expand Array Drive):
Using this method you are allowed to do one of the following:
•
Convert unused free space on the existing logical drives of the RAID array drive into a
separate host drive, or
•
Add additional physical disk drives to the existing RAID array drive
4.3.7.2 RAID Level Migration
RAID level migration is accomplished using the Expand Array Drive feature. To expand a RAID 0
drive to a RAID 4 or 5, requires that you add at least one additional drive to the array. Migrating
from RAID 4 or 5 to RAID 0 frees one disk. The RAID controller allows the following RAID level
migrations of a given array drive:
RAID 0
RAID 0
distributed over all disk
RAID 5
RAID 4
RAID 4
RAID 5
Basic migration process: RAID 0 < --> RAID 4 < -- > RAID 5
To initiate a migration the RAID array must be have a status of ready.
4.3.7.3 Data Strip Size Configurable per RAID Array
The strip size for each RAID array can be configured at the time of creation of the RAID array.
This is a one-time configuration and cannot be changed or migrated once the array has been
created. For RAID 0, 4, 5, and 10 arrays the following Strip Sizes are possible:
•
16KB
•
32KB
•
64KB
•
128KB
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RAID 4: add new disk, parity is calculated and written to new disk
RAID 5: add new disk, parity calculated and written to new disk, then parity is
RAID 0: parity written to one disk, parity disk freed and removed
RAID 0: parity disk freed and removed
RAID 5: parity distributed over all disk
RAID 4: parity written to one disk
Technical Product Specification