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Architecture and Components 2-17
Hitachi Universal Storage Platform V/VM User and Reference Guide
Hard Disk Drive Intermix
All hard disk drives (HDDs) in one array group (parity group) must be of the
same capacity and type. Different HDD types can be attached to the same BED
pair. All HDDs under a single BED pair must operate at the same data transfer
rate (200 or 400 MB/sec), so certain restrictions apply. For example, when an
array group consisting of HDDs with 200 MB/sec transfer rate is intermingled
with an array group consisting of HDDs with 400 MB/sec transfer rate, both
array groups operate at 200 MB/sec.
Device Emulation Intermix
Figure 2-9 illustrates an intermix of device emulation types. The Universal
Storage Platform V supports an intermix of all device emulations on the same
BED pair, with the restriction that the devices in each array group have the
same type of track geometry or format.
The Virtual LVI/LUN function enables different logical volume types to coexist.
When Virtual LVI/LUN is not being used, an array group can be configured with
only one device type (for example, 3390-3 or 3390-9, not 3390-3 and 3390-
9). When Virtual LVI/LUN is being used, you can intermix 3390 device types,
and you can intermix OPEN-x device types, but you cannot intermix 3390 and
OPEN device types.
Note: For the latest information on supported LU types and intermix
requirements, please contact your Hitachi Data Systems account team.
4th
BED
Pair
2nd
BED
Pair
3rd
BED
Pair
1st
BED
Pair
OPEN-3
3390-9
OPEN-V
A
rray Frame
A
rray Frame
3390-9
3390-3
OPEN-V
A
rray Frame
A
rray Frame
USP V
Controller Frame
Figure 2-9 Sample Device Emulation Intermix