StorGateTM
Storage Gateway
for VOS Continuum to HP XP
Connectivity
SCSI Model
Product Brief
The DRA StorgateTM Storage Gateway
is a drop-in solution which provides VOS Continuum hosts with seamless access to
VOS data on HP XP storage arrays.
StorGate meets all requirements for a
certified host. By using StorGate, Stratus VOS Continuum users
can store and retrieve VOS data on their existing storage arrays while
maintaining full support for their equipment.
Key Features
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Provides drop-in fully supported VOS-to-HP connectivity
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Connects directly to HP via Fibre
Channel
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Connects directly to VOS Continuum via
K450/K460 SCSI ports
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Allows VOS to see HP storage as
common VOS disk types (D706, D711, D712)
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Emulates VOS disks and disk trays - up to
12 virtual VOS disks per StorGate/RAID unit
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Accesses up to 3.2 TB logical (6.4 TB physical) on an
HP RAID from a single VOS host (using multiple StorGate units, K450s/K460s and HP host ports)
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Stores VOS data directly in VOS file format
(Note: VOS does not support data sharing between hosts)
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Can be duplexed to standard Stratus VOS
disks or can be used in pairs for duplexing
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Meets or exceeds native
VOS disk performance in most applications (using HP mirroring
with metavolumes)
Subsystem Overview
StorGate provides
a connection between a VOS Continuum BIO (K450/K460) port and
HP host
adapter port. StorGate "on-the-fly" disk emulation and
data translation capabilities allow VOS Continuum users to store and retrieve
data on a HP just as if the data were stored on standard
Stratus disks.
Each StorGate unit provides access to up to 12
virtual VOS disk volumes on the HP. Each of these virtual disks may be a VOS D706, D711, or a D712 disk type. This means that each StorGate unit allows a VOS Continuum to access up to 408 GB (physical) on a
HP storage array. Multiple StorGate units may be attached
to multiple BIO ports on a single VOS Continuum host to provide access to as
much HP storage capacity as desired, up to the maximum allowed by VOS
(3.2 TB logical, 6.4 TB physical). Multiple StorGate
units may also be used to allow multiple VOS Continuum hosts to access one or
more HP storage arrays. (Although StorGate allows
multiple VOS hosts to store data on a single HP, VOS limitations prevent
sharing that data between hosts.)
StorGate supports all VOS disk-related
commands and functions. It uses standard RAID hypers and metavolumes to store VOS
data on an HP storage array. This allows the HP to manage VOS virtual
disks as standard RAID storage volumes. Both mirrored and Raid-S volume types
are supported.
Physical Connections
A VOS Continuum host connects to StorGate
through a Continuum BIO (K450/K460) SCSI port. A HP connects
to StorGate through a Fibre Channel port on a HP Fibre Channel host adapter. (Refer
to the StorGate Technical Specifications for connection
details.)
Performance
Laboratory tests indicate that for many
applications StorGate provides throughput which equals or exceeds that of
equivalent Stratus disks. In these laboratory tests the best performance was
achieved when the virtual disks on the Target were configured as Target-specific
mirrored metavolumes. Performance in other environments may vary, and
depends upon a variety of factors. These factors include application data access
patterns, overall HP configuration, and I/O activity by other
hosts attached to the Target.
Product Support
DRA products purchased through Stratus
are supported jointly by DRA and Stratus. DRA products
purchased directly from DRA are supported through the Co-active Maintenance
Service (CMS). CMS is a total support agreement which is available "around
the clock, around the world" to participating DRA customers. Product
maintenance, product updates, documentation and training are available through
CMS support. CMS is provided free of charge for 90 days following product
installation, and may be extended by contract thereafter.
