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Dell PowerVault MD3200 Series Техническое руководство

Technical Guide Book for PowerVault MD3200MD3220

Table 7.

RAID Configuration Support

RAID-0

Data is striped

Description

across multiple

physical disks.

Min # of physical

disks in a disk

group

Max # of physical

disks in a disk

group

Usable capacity as

100%

% of raw capacity

Application

IOPS | MB/s

Performance due

to parallel

Advantages

operation of the

access

No redundancy.

Disadvantages

One physical disk

fails, data is lost

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

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).

RAID-1 and 1+0

RAID-5

Physical disks operated

independently with data

Data is "mirrored"

and parity blocks

to another

distributed across all

physical disk.

physical disks in the

group.

50%

66.67% to 96.67%

IOPS

IOPS | MB/s

Good for reads, small

Performance as

IOPS, many concurrent

multiple requests

IOPS and random I/Os.

can be fulfilled

Parity utilizes small

simultaneously

portion of raw capacity.

Storage costs are

Writes are particularly

doubled

demanding

per MD3200 series

Disk

RAID-6

Physical disks operated

independently with data

and dual parity blocks

are distributed across all

physical disks in the

group.

50% to 93.33%

IOPS | MB/s

Same advantages as

RAID-5 but with better

data protection. Two

hard drives can fail

without losing access to

data.

Overhead on writes will

be slightly more

demanding than RAID-5

Disk Group A

Disk

Virtual Disk