Toshiba Magnia 560S - Manual (Page 128)

Configuring Arrays and Logical Drives 110
MegaRAID BIOS Configuration Utility
5. Add physical drives to the current array as desired.
Try to use drives of the same capacity in a specific array. If you use drives with
different capacities in an array, all the drives in the array are treated as though they
have the capacity of the smallest drive in the array.
The number of physical drives in a specific array determines the RAID levels that
can be implemented with the array.
RAID 0 requires one or more physical drives per array.
RAID 1 requires 2 physical drives per array.
RAID 5 requires at least three physical drives per array.
6. Press <Enter> when you are finished creating the current array.
To continue defining arrays, repeat steps 3 - 5. To begin logical drive configuration,
go to step 5.
7. Press <F10> to configure logical drives.
The logical drive configuration screen displays the logical drive that is currently
being configured, as well as any existing logical drives. The column headings are:
LD - The logical drive number
RAID - The RAID level
Size - The logical drive size
#Stripes - The number of stripes (physical drives) in the associated physical array
StrpSz -The stripe size
DriveState - The state of the logical drive
8. Highlight RAID and press <Enter> to set the RAID level for the logical drive.
A list of the available RAID levels for the current logical drive appears.
Select a RAID level and press <Enter> to confirm.
9. See Chapter 3, RAID Levels for your board for an explanation of the RAID levels.
10. Highlight Span and press <Enter> to set the spanning mode for the current logical
drive. The choices are:
- CanSpan -Array spanning is enabled for the current logical drive. The logical
drive can occupy space in more than one array.
- NoSpan - Array spanning is disabled for the current logical drive. The logical
drive can occupy space in only one array.
For two arrays to be spannable, they must have the same stripe width (they must
contain the same number of physical drives) and must be consecutively numbered.
For example, assuming Array 2 contains four disk drives, it can be spanned only
with Array 1 and/or Array 3, and only if Arrays 1 and 3 also contain four disk drives.
If the two criteria for spanning are met, MegaRAID automatically allows spanning.
If the criteria are not met, the Span setting makes no difference for the current
logical drive.
11. Configure a RAID 10 or RAID 50 logical drive.
- Configure RAID 10 by spanning two contiguous RAID 1 logical drives. The
RAID 1 logical drives must have the same stripe size.
- Configure RAID 50 by spanning two contiguous RAID 5 logical drives. The
RAID 5 logical drives must have the same stripe size.