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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
1
2
No
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
2 or more
Yes
Removes redundancy
while increasing
capacity.
RAID 1
RAID 5
2
3 or more
Yes
Maintains redundancy
while doubling capacity.
RAID 1
RAID 6
2
4 or more
Yes
Two drives are required
to be added for
distributed parity data.
RAID 5
RAID 0
3 or more
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
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
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