User guide

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RAID 5 (Stripe set with striped parity)
Number of drives: at least 3
Unit capacity: size of one member times number of members minus one.
Spares: yes
Fault tolerance: can withstand the loss of one drive without losing data.
RAID 5 works by striping entire I/O blocks across all members of the set, with
each member taking turns carrying parity data computed by the Port Multiplier.
In the event of failure, the missing information can be calculated using the parity
information.
CLONE (Mirror set)
Number of drives: at least 2
Unit capacity: size of one member.
Spares: yes
Fault tolerance: can withstand the loss of any number of drives without losing
data as long as at least one complete member remains online. CLONE mode
works the same way as RAID 1, by maintaining a complete copy of the entire
set of data on each drive.
LARGE (Spanned set)
Number of drives: at least 2
Unit capacity: 100% of all drives together regardless of differences in size
Spares: no
Fault tolerance: cannot withstand the loss of any drives without losing data.
However, some data may be recovered as long as the drive(s) carrying the file
system data (boot record, directory, etc.) remain online. LARGE mode is neither
a RAID nor is it a JBOD. It works by declaring the sum of all available space of
the member drives as a single unit, without striping the data. As each member is
filled, new data is stored on the next.
Notes about Spare Drives
To create an array with one or more spares, set or modify the RAID mode while
the spares are not inserted in the RAID array. When EZ mode is enabled
(SW1:2 OFF), individual drives connected when an array is present are
considered spare. Spare drives must be equal to or larger in size than the
smallest member. When any type of array is defined, individual units will be
considered spare.
If EZ mode is disabled (SW1:2 ON), all individual drives not configured as array
members will be offered to the host adapter as separate units. The Secure NAS
unit does not the Port Multiplier's switching protocol, so this feature is not
supported.
RAID 0 and LARGE arrays are not fault-tolerant and spare drives will not be
useful. When a spare drive is present and a fault-tolerant RAID (1, 10, 3, 5, or
CLONE) is defined, EZ mode will automatically rebuild any available spares into
the array to replace a failed member. During this process, the spare drive's Error
LED will flicker along with the RAID Error LED until rebuilding is complete.