Storage networks can be broadly classified into 3 levels and the fail over or Redundancy feature is very important aspect of IT storage business and it is implemented in every interconnecting components in the networks.
Host or Server(s) Level
Network Level
Storage sub-system(s) Level
Fail-Over:
If the data passage path of any of the component in the storage networks fails, the auto-mechanism that provides an alternate path instantly to avoid the data loss is called fail-over.
Example: If a component such as a RAID controller module or a cable fails, or an error occurs on the data path to the preferred RAID controller module, virtual disk ownership is moved to the alternate non preferred RAID controller module for processing. This failure or error is called failover.
Host or Server Level:
Hosts or servers are associated with few interconnect peripherals such as Host Bus Adapter [HBA], Ethernet adapters et al. some common fail-over feature implementations that you see is at the HBA device in the form of Fail-over driver such as MPP or MPIO [Multi Path driver].
Another stage of fail-over implementation could be to the entire host or server in the form of Clustering, Microsoft Clustering or Linux or Solaris or Unix clustering.
Network Level:
At Switches or Routers, we can provide fail-over by connecting one port or path of the servers & storage sub-systems to one switch port & another port or path connected through another switch port. thus we need at the least two switches to handle the Preferred path & Alternative path of data passage.
usually such setups are know as High Availability Fail-over setup.
Sub-system Level:
Within the SAN storage sub-systems, there are multiple components such as RAID Processors or controllers, Hard disks, Drive trays, power supplies et al.
At Hard disk level , RAID & Hot sparing is used in co-operation with RAID processors as fail-over.
At Drive tray or Enclosure level, there will be dual Service Modules that act as fail-over.
At the RAID Processor or Controller level, there will be Dual RAID processors or Controllers that provide fail-over mechanism.
Fail-over is very vast concept and there are plenty of ways to implement it at different components of the storage networks. for more information you can always buzz me on Email.
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Saturday, December 13, 2008
Friday, November 28, 2008
Terrorism is a dangerous mental disorder or disease
******The views expressed in this blog is my personal feelings **********
First thing first - Terrorism any where in any part of our beautiful world is unacceptable & i strongly condemn it.
Today, am tempted to write this blog as i felt the top priority problem the whole world facing is Terrorism.
in my personal view & with all respect to my understanding about global living style. i declare its time to say we are one globe (not individual countries).
i declare probably the first person to say "Terrorism is a global disease (like AIDS or something else), it is a mental disorder and we have the at most global challenge to eradicate it.
it is not easy to eradicate as it is mental disorder. we the global human beings should unite & create a global anti-terrorism framework.
this problem can not be solved by just having anti-terror squad or Intelligence bureau or defense force. this is the time to understand about the nature of disease and find out a near to perfect vaccine.
i think the best vaccine for this is going to be years of mental caring for each and every individual of the globe.
Solutions:
* Change the entire education system starting from the baby-sitting till the end of life of the individual.
* Education system is the best mechanism to deal with this problem. all over globe include terror & terrorism as mandatory subject of studies & then focus to establish a terrorism syllabus that can be related by each & every individual and interesting enough to learn.
important point to keep in mind is the syllabus should bring out the negativity of the terrorism & show the positive way of dealing with it.
* The need of the hour is not just being defensive about terrorism but to make sure that every individual on earth will have in his blood to fight against terrorism & also, never choose the terrorism as profession.
* Mental disorder like "Terrorism" is very dangerous & it is slowly contaminating the blood of every individual of the globe. so act fast before it engulf us.
* Along with education, we should have a global Anti-terror framework & Global intelligence bureau or Global defense force because to eradicate the mental disorder "terrorism", we should be prepared with multi-level solutions.
* Make it mandatory that every personal of this globe should compulsorily work in armed force for at least 2 years or social service for at least 3 years before taking up their individual profession or Business.
* every country on the earth should be uniformly follow all these frame work and if any country not doing it, will be punished in all means by the rest of the world.
* Idea is to make sure we have every individual on earth who has the best education for Anti-terrorism, practical exposure to actual life in terms of Armed force or Social service Job.
* Idea is to create a global sense that "we the human beings, are the only one of our kind & we the one globe on the Earth".
First thing first - Terrorism any where in any part of our beautiful world is unacceptable & i strongly condemn it.
Today, am tempted to write this blog as i felt the top priority problem the whole world facing is Terrorism.
in my personal view & with all respect to my understanding about global living style. i declare its time to say we are one globe (not individual countries).
i declare probably the first person to say "Terrorism is a global disease (like AIDS or something else), it is a mental disorder and we have the at most global challenge to eradicate it.
it is not easy to eradicate as it is mental disorder. we the global human beings should unite & create a global anti-terrorism framework.
this problem can not be solved by just having anti-terror squad or Intelligence bureau or defense force. this is the time to understand about the nature of disease and find out a near to perfect vaccine.
i think the best vaccine for this is going to be years of mental caring for each and every individual of the globe.
Solutions:
* Change the entire education system starting from the baby-sitting till the end of life of the individual.
* Education system is the best mechanism to deal with this problem. all over globe include terror & terrorism as mandatory subject of studies & then focus to establish a terrorism syllabus that can be related by each & every individual and interesting enough to learn.
important point to keep in mind is the syllabus should bring out the negativity of the terrorism & show the positive way of dealing with it.
* The need of the hour is not just being defensive about terrorism but to make sure that every individual on earth will have in his blood to fight against terrorism & also, never choose the terrorism as profession.
* Mental disorder like "Terrorism" is very dangerous & it is slowly contaminating the blood of every individual of the globe. so act fast before it engulf us.
* Along with education, we should have a global Anti-terror framework & Global intelligence bureau or Global defense force because to eradicate the mental disorder "terrorism", we should be prepared with multi-level solutions.
* Make it mandatory that every personal of this globe should compulsorily work in armed force for at least 2 years or social service for at least 3 years before taking up their individual profession or Business.
* every country on the earth should be uniformly follow all these frame work and if any country not doing it, will be punished in all means by the rest of the world.
* Idea is to make sure we have every individual on earth who has the best education for Anti-terrorism, practical exposure to actual life in terms of Armed force or Social service Job.
* Idea is to create a global sense that "we the human beings, are the only one of our kind & we the one globe on the Earth".
Monday, September 22, 2008
IP based SAN Technologies:
On request by few of my blog readers, i will be posting iSCSI specific information in my upcoming posts.
Storage Neworking technologies from past few decades was dominated by the high speed serial Fibre channel [FC] & SCSI [Small Computer System Interface], the implementation use to be for limited enterprises because of high cost of implementation.
over the period of time, Technology evolved & more enterprise inter-network demands resulted in rapid innovations for implementing the storage networks to work on traditional & highly conventional TCP/IP protocol technology.
As a initial innovation result FCIP & iFCP were implemented. the TCP/IP protocol is used as Gateway protocol on Gateway devices that inter connect the two or more FC SAN sub-networks.
FCIP: Fibre Channel over TCP/IP
* A TCP/IP based tunneling protocol for connecting geographically distributed Fibre Channel SANs transparently to both FC and IP.
* Provides a mechanism to tunnel Fibre Channel over IP based networks
* Leverage IP infrastructure to interconnect and extend FC SAN.
* FCIP Gateways enable to connect to a standard Gigabit Ethernet/IP network.
* Cost effective
* The FCIP gateway can be a separate device, or its functionality can be integrated into the Fibre Channel switch.
* Can be deployed over LANs, MANs and WANs
iFCP: Internet Fibre Channel Protocol
* iFCP is TCP/IP based Session protocol for connecting two or more FC SANs, two devices from two different FC SANs.
* Fibre Channel devices (e.g., switches, disk arrays, and HBAs) connect to an iFCP gateway or switch. Each Fibre Channel session is terminated at the local gateway and converted to a TCP/IP session via iFCP.
A second gateway or switch receives the iFCP session and initiates a Fibre Channel session.
* Sessions include device-to-device, device-to-SAN, and SAN-to-SAN communications.
Pictures attached with this post will give you brief idea about FCIP, iFCP & iSCSI.
The latest & hottest TCP/IP implementation is iSCSI protocol & the entire SAN can be designed on Ethernet or TCP/IP technology using iSCSI Protocol structure.
i will be posting detailed information about iSCSI technology in the upcoming posts, watch out this space.....
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