iSCSI
Our Product enables remote
SCSI storage access from hosts and storage systems no matter
where they reside—on Ethernet networks or Fibre Channel
SANs
How it works
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In a system supporting
iSCSI , the initiator (an entity on the client machine)
connects to an iSCSI server on providing the IP Address
of the server machine .
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The Initiator
then issues a session login request. This authenticates
initiator’s identity and the iSCSI device names(identifiers
for the devices) are enlisted on the initiator’s
end .
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If the session
login and authentication process is successful , the initiator
can then issue a connection request on providing the iSCSI
device name , to connect to a device on the server.
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Now, any user
or software application on the client machine can issue
a command to store or retrieve data on a SCSI storage
device, as if it was locally connected . The request is
processed by the operating system and is converted to
one or more SCSI commands that are then passed to our
iSCSI client software.
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The SCSI command
and data are encapsulated by representing them as a serial
string of bytes proceeded by iSCSI headers called iSCSI
PDU’s. These iSCSI PDU’s are then passed to
a TCP/IP layer that breaks it into packets suitable for
transfer over the network. The packets are sent over the
network or the Internet.
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At the receiving
end, our iSCSI Server software recombines the received
packets into the original SCSI commands and data and uses
the iSCSI headers to send the SCSI control commands and
data to the appropriate device, which performs the functions
that were requested by the original computer or application.
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If a request
for data has been sent, the data is retrieved from the
device, encapsulated and returned to the requesting computer.
The entire process is transparent to the user.
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DCM’S
iSCSI Initiative
Internet SCSI (iSCSI ) is
a standard that defines the encapsulation of SCSI packets
in TCP and then routing it using IP. It allows block-level
storage data to be transported over widely used IP networks,
enabling data access virtually from anywhere reachable through
internet, effectively eliminating the physical boundaries
of the storage network.
DCM iSCSI Software
Solution is a high performance, interoperable and versatile
storage solution. It allows access to any Storage Server from
anywhere in the world. It is an easy to integrate and cost
effective solution, which can be conveniently adapted. The
iSCSI Storage Solution can be used both in the non-embedded
and embedded applications like for iSCSI Host Bus Adapters.
Salient Features
- iSCSI Protocol Draft 20
compliant.
- Developed for LINUX Kernel 2.4.18
- OS Independent Code – can
be easily ported to any other operating system.
- Scatter-Gather I/O support - for
enhancing performance
- Higher Bandwidth – Supports
multiple connections for a single Session.
- CHAP used for authentication between
the initiator and the target.
- Naming and Discovery – Allows
identification and configuration of devices
- Multiple Session support at the
initiator and the target
- Configuration Utility - to Add /
Remove iSCSI devices.
- Protocol Analyzer – A Development
and debugging tool that shall prove handy in Interoperability
Testing.
- Portability – For Maximum
portability, the iSCSI protocol is implemented in ANSI C.
- Investment Protection – Works
on existing TCP/IP infrastructure.
- API Library – API Library
provided to use iSCSI with a third party application.
- Basic Product Layers
- iSCSI Initiator Software
- iSCSI Target Software
Product Support
DCM Technologies, with its proven skills, provides integration
and post-integration services comprising of:
- Design Documentation
- Porting & Integration
- Application Development
- Interoperability testing with other third party solutions
Benefits
- Can be used as a building block
in value added applications like Remote Storage with access
for multiple iSCSI Initiators.
- High Performance
- Supports multiple connections on a Single Session.
- Scatter Gather I/O support.
- Modular Design - easily customizable
as per needs
- Authenticated - supports CHAP at
initiator and target.
- Low cost of Implementation - Uses
existing TCP/IP infrastructure.
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