ATTO Technology Diamond Storage Array S-Class - Manual (Page 60)

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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
6.0 Configuring Drives
The Diamond Storage Array can be configured as a JBOD, RAID Level 0, RAID Level 1, RAID Level
10 or RAID Level 5 array. Its default is JBOD. RAID is a storage configuration which uses multiple disk
drives to increase capacity, performance and/or reliability.
You may configure your Diamond Storage Array
in several different ways depending on your needs
although the Diamond makes some choices for
your. The following elements must be considered
when you are configuring your Diamond.
• RAID level
• Interleave
• Hot Spares option
Using the ExpressNAV browser-based interface is
the easiest way to set up your Diamond. You may
also use the Command Line Interface commands.
CAUTION CAUTION
Changing these parameters causes all
previous drive data on the Diamond
Storage Array to be erased. Make sure you
back up all information before setting up a
different configuration.
JBOD (Just a Bunch of Disks)
JBOD (Just a Bunch of Disks) configuration, the
default for the Diamond Storage Array, allows
many individual disk drives to be available for
normal storage operations. A JBOD configuration
allows you to access each disk drive in the array
independently. Any action you can do to a normal
disk drive can be performed on any disk in the
JBOD.
RAID Level 0
RAID Level 0 (striping) is based on the fact that
increased disk performance can be achieved by
simultaneously accessing data across multiple
disk drives in an array. This arrangement
increases data transfer rates while reducing
average access time by overlapping drive seeks.
RAID Level 0 groups provide data that is striped
across several drives. RAID Level 0 is pure
striping, without redundancy, meaning there is no
data protection. If one disk fails, all data within
that stripe set is lost.
RAID Level 0 is used by applications requiring
high performance for non-critical data.
The QuickRAID0 command, accessed through
the CLI, allows a simple, fast, out-of-the-box
setup of the array into evenly-sized RAID Level 0
stripe groups.
RAID Level 1
RAID Level 1 (mirroring) ensures the security of
data by writing the exact same data
simultaneously to two or more different drives.
This application is for users with critical data
which cannot be lost or corrupted due to the
failure of a single drive.
With RAID Level 1, the host will see what it
believes to be a single physical disk of a specific
size: it does not know or care about the mirrored
pair. The RAID controller manages where data is
written and read, allowing one disk to fail without
the host knowing it has failed. The array will send
notification of the failure over the serial or
Ethernet port and the fault LED will be
illuminated. Service personnel can then replace
the failed drive and initiate a rebuild.
RAID Level 1 is used in applications containing
mission critical data. The QuickRAID1
command, accessed through the Command Line
Interface, allows a simple, fast, out-of-the-box
setup of the array into RAID Level 1 mirrored
groups.
RAID Level 10
RAID Level 10 (mirroring with striping)
increases data transfer rates while ensuring
security by writing the exact same data
simultaneously to two or more different drives.