OWC Mercury Rack Pro mini-SAS, Руководство пользователя и инструкция по эксплуатации

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OWC Mercury Rack Pro SAS Chapter 1 - Introduction
1.6 RAID Modes
The OWC Mercury Rack Pro mini-SAS does not have any RAID functions built in;
however most RAID cards you will choose to use with the OWC Mercury Rack Pro
mini-SAS will. These definitions of different RAID modes are provided to help you
decide which mode is best for you to use.
1.6.1 Combine
The drives show up as one large single volume. The total size will depend on the drives
installed, you can use drives of different capacities. Combining is an array (not RAID)
that is written sequentially to, across the hard drives. By itself, it does not provide any
performance or redundancy benefits.
1.6.2 Disk Striping (RAID 0)
The drives show up as one large (single) volume. It is highly recommended to use
identical hard drives for this RAID method. However, you can utilize drives of different
capacity, but realize that the RAID size will be based on the smallest capacity total of
the drives used in the RAID set.
Used when speed is the primary objective but RAID Level 0 (also called “striping”) is
not redundant. This array splits each piece of data across the drives in segments. Since
data is written without parity data-checking, it allows for the fastest data transfer rates,
but if one drive fails, the whole array can become corrupted.
1.6.3 Disk Mirroring (RAID 1, only 2 drives installed)
The drives show up as one volume, but only 50% of the total capacity can be used. It
is highly recommended to use identical hard drives for this RAID method. However,
while you can utilize drives of different capacity, the RAID size will be based on the
smallest capacity total of the drives used in the RAID set. RAID 1 creates an exact copy
(or “mirror”) of a set of data on the second drive. This is useful when reliability and
backup are more important than capacity. When one drive fails, it can be replaced and
the data rebuilt.
Storage Capacity
Data Safety
Performance
Storage Capacity
Data Safety
Performance
Storage Capacity Data Safety Performance