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Technical Guide Book for PowerVault MD3200MD3220

Table 7. RAID Configuration Support

RAID-0 RAID-1 and 1+0 RAID-5 RAID-6

Description

Data is striped

across multiple

physical disks.

Data is “mirrored”

to another

physical disk.

Physical disks operated

independently with data

and parity blocks

distributed across all

physical disks in the

group.

Physical disks operated

independently with data

and dual parity blocks

are distributed across all

physical disks in the

group.

Min # of physical

disks in a disk

group

1 2 3 4

Max # of physical

disks in a disk

group

96 96 30 30

Usable capacity as

% of raw capacity

100% 50% 66.67% to 96.67% 50% to 93.33%

Application IOPS | MB/s IOPS IOPS | MB/s IOPS | MB/s

Advantages

Performance due

to parallel

operation of the

access

Performance as

multiple requests

can be fulfilled

simultaneously

Good for reads, small

IOPS, many concurrent

IOPS and random I/Os.

Parity utilizes small

portion of raw capacity.

Same advantages as

RAID-5 but with better

data protection. Two

hard drives can fail

without losing access to

data.

Disadvantages

No redundancy.

One physical disk

fails, data is lost

Storage costs are

doubled

Writes are particularly

demanding

Overhead on writes will

be slightly more

demanding than RAID-5

Virtual Disk Configuration

A virtual disk is a logical structure on a storage array

for data storage. A virtual disk is created by slicing a

disk group into a stripe set with a defined capacity.

Each disk group supports up to one or more virtual disks

and a maximum of 256 virtual disks per MD3200 series

of storage system. During the virtual disk creation

process, the user specifies the capacity of the virtual

disk and the virtual disk name. Additional settings

include preferred controller ownership and a virtual

disk-to-LUN mapping parameter (See Storage

Partitioning section).

Disk

Disk Group A

Virtual Disk

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 38 39 40

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