4.1 Basic RAID Questions. Shuttle SN27P2, SN27P2 V2

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4.1 Basic RAID Questions. Shuttle SN27P2, SN27P2 V2 | Manualzz

4. NVRAID FREQUENTLY ASKED QUESTIONS

4.1 Basic RAID Questions w What is RAID?

RAID stands for R edundant A rray of I ndependent D isks, and refers to the grouping of 2 or more disk drives that the system views as a single drive. Different groupings have difference advantages that include better performance and data fault tolerance.

See “About NVIDIA RAID” on page 1 for detailed descriptions of the different types of RAID arrays.

w

What type of RAID array is right for me?

In general, for better throughput of non-critical data, use RAID 0; for fault tolerance, use RAID1, and for better throughput as well as fault tolerance use RAID 0+1.

See “About NVIDIA RAID” on page 1 for detailed descriptions of the different types of RAID arrays.

w What i s the difference between a bootable and a nonbootable RAID array?

A system with a non-bootable RAID array includes a separate hard disk that contains the OS and is not part of the RAID array.

See “Non-Bootable RAID Array” on page 10 for more information.

In a bootable RAID array, the OS is installed on the RAID array disks.

See “Bootable RAID Array” on page 10 for more information.

w I just configured a RAID 1 array— why is the array size onehalf the total cumulative size of the drives?

RAID 1 uses one-half the total disk space for data redundancy.

See “RAID 1” on page 4 for more information on RAID1 arrays.

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50 w What is the optimal hard drive configuration for RAID 1

(mirror)?

In a mirrored array, a mirror is created using the maximum drive size of the smaller of the two drives. Ideal configuration is achieved using drives of identical size.

w How do I configure a multiple array system?

Two different arrays can be configured and active at the same time. For example, a mirrored array with two hard drives, as well as a striped array using three hard drives can exist at the same time. You need to configure each array separately in the RAID

BIOS as well as initialize the arrays in Windows as described in

“Setting Up Your RAID Configuration” on page 10.

w Why is the cumulative size of a RAID 0 (Stripe) or RAID 0+1

(Stripe-Mirror) not equal to the sum of the drives?

The drive size is controlled by stripe blocks. If you have mismatched drive sizes, the size of the array is approximately the size of the smaller drive multiplied by two. This is done because there must be corresponding data locations between the drives in the array. Any space beyond the corresponding points is not usable.

w Why can I not get into Windows after adding a non-bootable array?

Possible cause would be adding the boot drive to the array and then clearing the array.

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