বাংলা চেক
Thursday, October 2, 2008
Saturday, May 3, 2008
Sunday, April 27, 2008
Saturday, April 26, 2008
Friday, April 25, 2008
Thursday, April 24, 2008
New Face Of Bangladeshi Women
A Bangladeshi women in Dhaka showing support for Bangladesh Cricket team.
photo courtesy: Drishtipat blog
photo courtesy: Drishtipat blog
New face of Bangladeshi Women
A Bangladeshi women in Dhaka showing support for Bangladesh Cricket team.
photo courtesy: Drishtipat blog
photo courtesy: Drishtipat blog
Wednesday, April 23, 2008
FCoE: the evolutionary approach to SAN expansion
System consolidation and SAN expansion efforts driving the need for a unified fabric where multiple traffic types are all carried over a single network infrastructure.......
Since the emergence of Fibre Channel SANs in the late 1990s, enterprise IT managers have maintained two sets of networks, one for storage I/O traffic and the other for data network traffic. But system consolidation and SAN expansion efforts are driving the need for a unified fabric where multiple traffic types -- network, storage and clustering -- are all carried over a single network infrastructure.
Several options to unify and extend the reach of storage networks have emerged over the last decade, including iSCSI, FCIP, iFCP and InfiniBand. But these options turned out to be performance intensive, too disruptive or, in the case of InfiniBand, required the introduction of new infrastructure.
To facilitate convergence and overcome the problems encountered with the other attempts, a consortium of storage and data network vendors under the aegis of the INCITS T11 committee is working on a new standard called Fibre Channel over Ethernet (FCoE). FCoE is designed to enable network convergence and cost-effective SAN expansion in the enterprise data center.
The basic concept is to use 10G Ethernet to carry native Fibre Channel traffic alongside standard network traffic. However, Ethernet does not provide the performance and reliability characteristics required for carrying Fibre Channel traffic, so several enhancements are required.
Enhancements to Ethernet
The key drawbacks of Ethernet are that it is prone to high latencies and packet loss when the network gets congested -- characteristics that are highly unsuitable for storage traffic. The IEEE is working on enhancements to the Ethernet protocol -- appropriately called Enhanced Ethernet -- that would enable the venerable technology to support multiple traffic types.
Key enhancements to 10G Ethernet include the ability to:
-> Control the flow of traffic -- without packet loss -- at a more granular level through the implementation of priority flow control.
-> Allocate bandwidth dynamically and ensure QoS for multiple classes of traffic.
-> Exchange the new protocol parameters between the end nodes and the switches.
A new family of adapters called converged network adapters (CNA) leverage FCoE and Enhanced Ethernet technologies to enable convergence over the underlying 10G Enhanced Ethernet infrastructure. The FCoE technology maps Fibre Channel traffic directly onto Enhanced Ethernet frames, facilitating Fibre Channel SAN expansion in the enterprise data center without requiring physical extension of the SAN fabric to the additional servers.
Several options to unify and extend the reach of storage networks have emerged over the last decade, including iSCSI, FCIP, iFCP and InfiniBand. But these options turned out to be performance intensive, too disruptive or, in the case of InfiniBand, required the introduction of new infrastructure.
To facilitate convergence and overcome the problems encountered with the other attempts, a consortium of storage and data network vendors under the aegis of the INCITS T11 committee is working on a new standard called Fibre Channel over Ethernet (FCoE). FCoE is designed to enable network convergence and cost-effective SAN expansion in the enterprise data center.
The basic concept is to use 10G Ethernet to carry native Fibre Channel traffic alongside standard network traffic. However, Ethernet does not provide the performance and reliability characteristics required for carrying Fibre Channel traffic, so several enhancements are required.
Enhancements to Ethernet
The key drawbacks of Ethernet are that it is prone to high latencies and packet loss when the network gets congested -- characteristics that are highly unsuitable for storage traffic. The IEEE is working on enhancements to the Ethernet protocol -- appropriately called Enhanced Ethernet -- that would enable the venerable technology to support multiple traffic types.
Key enhancements to 10G Ethernet include the ability to:
-> Control the flow of traffic -- without packet loss -- at a more granular level through the implementation of priority flow control.
-> Allocate bandwidth dynamically and ensure QoS for multiple classes of traffic.
-> Exchange the new protocol parameters between the end nodes and the switches.
A new family of adapters called converged network adapters (CNA) leverage FCoE and Enhanced Ethernet technologies to enable convergence over the underlying 10G Enhanced Ethernet infrastructure. The FCoE technology maps Fibre Channel traffic directly onto Enhanced Ethernet frames, facilitating Fibre Channel SAN expansion in the enterprise data center without requiring physical extension of the SAN fabric to the additional servers.
The advantages of using the technology to expand SANs include:
Seamless extension of Fibre Channel SANs. Fibre Channel is the predominant storage protocol deployed in enterprise data centers. With the adoption of blade servers and server virtualization there is an increased demand for access to Fibre Channel SANs. FCoE addresses this requirement by leveraging 10G Enhanced Ethernet to carry Fibre Channel traffic and thus extends proven Fibre Channel SAN benefits to these environments.
Seamless extension of Fibre Channel SANs. Fibre Channel is the predominant storage protocol deployed in enterprise data centers. With the adoption of blade servers and server virtualization there is an increased demand for access to Fibre Channel SANs. FCoE addresses this requirement by leveraging 10G Enhanced Ethernet to carry Fibre Channel traffic and thus extends proven Fibre Channel SAN benefits to these environments.
Reduced total cost of ownership.. FCoE-enabled unified fabric reduces the overall number of NICs, cables and switch ports, which in turn lowers overall power and cooling requirements.
Increases IT efficiency.. Servers powered by CNAs are equipped to dynamically take on workloads that require SAN access without the need for hardware reconfiguration, significantly improving efficiency of operations.
Unifies management across Fibre Channel and FCoE fabric.. FCoE-enabled servers continue to leverage the Fibre Channel driver stack, multipathing schemes, etc. This enables enterprise data centers to leverage the existing Fibre Channel SAN management framework such as storage resource management tools and processes for FCoE-enabled servers as well.
Preserves reliability and performance requirements for SAN access.. FCoE avoids the latency and complexity issues of TCP. The lightweight encapsulation used in FCoE avoids processing overhead and ensures high levels of end-to-end storage networking performance.
FCoE technology provides an evolutionary approach to achieving high operational efficiencies within the network infrastructure. Besides unifying network fabrics, FCoE drives significant expansion of SAN access to a wider range of servers in the data center.
FCoE technology and solutions present numerous advantages while ensuring the reliable performance characteristics required in data center environments. As data centers transition to 10G Ethernet to meet the demands of blade servers and server virtualization environments, it is imperative for enterprise IT managers to deploy and evaluate 10G FCoE solutions. In addition to providing a competitive edge, FCoE technology paves the way for the next-generation, service-oriented data center.
FCoE technology provides an evolutionary approach to achieving high operational efficiencies within the network infrastructure. Besides unifying network fabrics, FCoE drives significant expansion of SAN access to a wider range of servers in the data center.
FCoE technology and solutions present numerous advantages while ensuring the reliable performance characteristics required in data center environments. As data centers transition to 10G Ethernet to meet the demands of blade servers and server virtualization environments, it is imperative for enterprise IT managers to deploy and evaluate 10G FCoE solutions. In addition to providing a competitive edge, FCoE technology paves the way for the next-generation, service-oriented data center.
Author::Bakthavathsalam is senior product marketing manager at Emulex.
Tuesday, April 22, 2008
Sunday, April 20, 2008
Dibosher Moddhannoo Konna
Ai maye tumi vabchooo kar kotha...??? Dibosh er olosh moddhannoo belai tumi akaki vabchoo kar kotha?????
Thursday, April 17, 2008
Tuesday, April 15, 2008
Chena Chena Lage
Chobita tula korea te, khub simple akta subject , but aktu kheyal korlei hoito bujha jabe keno tula ai chobita. amader bangladesh a oneker barir goli ta rater bela thik arokom ai dekhai. Ashole onek dur asheo amra khuje firi amader purono din gulo ke majhe majhe...atai je niom.
Megh er Kachakachi
"Akashe chorano megher kachakachi,
dekha jai tomader bari......"
Na ata kono bari noi. Ata korea University. Chobita tolar por nije dekhei obak. ar mone pore gelo "mohin er ghoraguli (Kolkatar band)" uporer oi ganta...ar tai gungun kore gaite gaite abar nijer kaje fera.
dekha jai tomader bari......"
Na ata kono bari noi. Ata korea University. Chobita tolar por nije dekhei obak. ar mone pore gelo "mohin er ghoraguli (Kolkatar band)" uporer oi ganta...ar tai gungun kore gaite gaite abar nijer kaje fera.
A Happy Couple
14th April 2008, we have visited at Seoul Grand Park... My Wife joly has enjoyed it very much.
In week days... I am too much busy with my work and it is too hard to find out time to give her company and make her happy. Thats why Only SATURDAY and SUNDAY is our own dayyyyyyyyyyy.....
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