Dell POWEREDGE RADI H800 - Manual (Page 16)

Dell
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