benefits of host bus adapter
DESCRIPTION
In this PDF we describe the feature of Host Bus Adapter. We describe the benefits of HBA. Sun SG-XPCIE2FC-QF4 PCI is one of these types of bus adapter. It is presented by http://www.shopricom.com/SGXPCIE2FCQF4TRANSCRIPT
Benefits of Host
Bus Adaptar
Buffer is a memory storage to
temporarily hold data. To
transfer data from different
devices this memory portion is
used
What is host bus
adapter
Host bus adapter is a circuit
board or integrated circuit
adapter it provides I/O
processing between physically
connected devices. It uses a microprocessor for storage and
retrieving of data. It has
associated disk subsystem it
sometimes called disk channel.
Benefits of HBA
data buffer
1) Need for data buffering.
2) Credit of buffer.
3) Calculate the credit
requirement.
4) Fibre channel architecture. 5) Hardware context cache.
6) Performance benefits.
Need for data
buffering
Application like remote
backup wide campus SAN
movement of high
bandwidth data over
extended distance. Key enabler to improve the
high distance is the buffer
of HBA. System with
heavy loaded PCI bus also
benefitted from buffer HBA.
Credit Buffer
In the Fibre channel data
is organized in a frame.
Size depends on 512 bytes
to 2 KB. Using buffer
credit mechanism it can transfer maximum amount
of data. It deliver
significantly high
performance in the lower
CPU overhead.
Calculate the
credit
requirement
Fibre channel
architecture
HBA with large data buffer
maintains high throughput
over long distance. Other
performance is impacted
due to it’s limited number of frames buffers. In long
distance like 10 km it
provides more than twice
performance than HBA
without large buffer.
Hardware
context cache
When HBA initiates I/O
command it stores
information to uniquely
identifying command. This
information is called context information it
must be correctly match
to the I/O command. When
data returned from I/O
command to the HBA it must also be matched
with context info.
Performance
Benefit
HBA dramaticaly limit the
performance in the
switched febric SAN.
Under the I/O febric load it
maintains the high throughput. In the switch
febric environment it’s
hardware context switch
provides more than twice
performance.
Advantage of
Host Bus
Adaptar HBA provides
performance advantage
using the feature of
hardware context and
large data buffer. In the higher bandwidth
performance hardware
context cache maintains
high performance. It has
the ability to increase link data rate. Example of this
type of bus is Sun SG-
XPCIE2FC-QF4 PCI
Express Host Bus
Adapters
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