User's Manual

USC and USC - LCE 53

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RAID 60

— Combines the straight block level striping of RAID 0 with the

distributed double parity of RAID 6. Your system must have at least eight

physical disk to use RAID 60. Because RAID 60 is based on RAID 6,

two physical disk from each of the RAID 6 sets could fail without loss

of data. Failures while a single physical disk is rebuilding in one RAID 6

set do not lead to data loss. RAID 60 has improved fault tolerance

because more than half the number of total physical disk must fail for data

loss to occur.

NOTE: The virtual disk size is automatically calculated and displayed in the Size field.

You cannot change the virtual disk size. The disk size may be displayed inaccurately

after you complete RAID configuration for a SAS 6/iR controller.

If you are using the Express Wizard, proceed to "Express Wizard Only -

Assign a Hot Spare."

If you are using the Advanced Wizard, click Next and proceed to "Advanced

Wizard Only - Select Physical Disks."

Express Wizard Only - Assign a Hot Spare

A hot spare is an unused backup physical disk that can be used to rebuild data

from a redundant virtual disk. A hot spare can be used only with a redundant

RAID level. Hot spares also have requirements for physical disk size. The hot

spare must be as big as or bigger than the smallest physical disk included in

the virtual disk. If the RAID level and physical disk availability do not meet

these requirements, a hot spare will not be assigned.

To assign a hot spare to the virtual disk:

Select the

Assign a Hot Spare Disk

check box or leave the check box clear.

Click

to continue with "Express Wizard Only - Review Summary."

Express Wizard Only - Review Summary

Review the virtual disk attributes you selected before creating a virtual disk.

CAUTION: Clicking the Finish button deletes all existing virtual disks except for

any foreign configurations that you specified should be kept. All data residing on

the deleted virtual disks will be lost.

Click Finish to create a virtual disk with the displayed attributes.

LC1_3.book Page 53 Monday, December 7, 2009 3:14 PM