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 Question: What types of RAID arrays is it possible for Active@
Undelete program to recover the data from?
 Answer:
Active@ UNDELETE can attempt to recover data from
following disassembled disk arrays:
- Spanned Virtual Volume
- Striped (RAID-0) Virtual Volume
- Mirrored (RAID-1) Virtual Volume
- RAID-5 Virtual Volume
Spanned Volume
A Spanned Volume composed of space located on several disk in proper
order.
RAID-0 (Striped)
This technique has striping but no redundancy of data. It offers the
best performance but no fault-tolerance.
RAID-1 (Mirrored)
This type is also known as disk mirroring and consists of at least
two drives that duplicate the storage of data. There is no striping.
Read performance is improved since either disk can be read at the
same time. Write performance is the same as for single disk storage.
RAID-1 provides the best performance and the best fault-tolerance in
a multi-user system.
RAID-5
This type includes a rotating parity array, thus addressing the
write limitation in RAID-4. Thus, all read and write operations can
be overlapped. RAID-5 stores parity information but not redundant
data (but parity information can be used to reconstruct data).
RAID-5 requires at least three and usually five disks for the array.
It's best for multi-user systems in which performance is not
critical or which do few write operations.
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