Dell PowerEdge Expandable RAID Controller 3 Podręcznik Użytkownika Pobierz pdf (Strona 16)

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DELL PERC H700 and H800 Technical Guide 16

Table 8. RAID Level Migration

Source RAID

Level

Target RAID

Level

# of Physical

Drives

(Beginning)

# of Physical

Drives (End)

Capacity

Expansion

Possible

Description

RAID 0

RAID 1

Converting non-

redundant virtual disk

into a mirrored virtual

disk by adding one drive.

RAID 0

RAID 5

1 or more

3 or more

Yes

At least one drive needs

to be added for

distributed parity data.

RAID 0

RAID 6

1 or more

4 or more

Yes

At least two drives need

to be added for dual

distributed parity data.

RAID 1

RAID 0

2 or more

Yes

Removes redundancy

while increasing

capacity.

RAID 1

RAID 5

3 or more

Yes

Maintains redundancy

while doubling capacity.

RAID 1

RAID 6

4 or more

Yes

Two drives are required

to be added for

distributed parity data.

RAID 5

RAID 0

3 or more

Yes

Converting to a non-

redundant virtual disk

and reclaiming disk space

used for distributed

parity data.

RAID 5

RAID 6

3 or more

4 or more

Yes

At least one drive needs

to be added for dual

distributed parity data.

RAID 6

RAID 0

4 or more

Yes

Converting to a non-

redundant virtual disk

and reclaiming disk space

used for distributed

parity data.

RAID 6

RAID 5

4 or more

Yes

Removing one set of

parity data and

reclaiming disk space

used for it.

4.5 Fault-Tolerance Features

Below is a list of features that provide fault tolerance to prevent data loss:

 Non-volatile cache: extends data retention from hours to years

 Support for SMART

 Redundant path support (for PERC H800 only)

 Physical disk failure detection

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 28 29

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