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Is iSCSI Reliable?

Posted on 2013-05-29
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Last Modified: 2013-06-03
I was asked if iSCSI is reliable? Compared to fiber channel or fiber channel over ethernet
What makes it reliable or unreliable? What are advantages/disadvantages to fiber channel?
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Question by:fireguy1125
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by:iammorrison
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iscsi is reliable, but requires hefty network bandwidth and for best performance, may require trunking (or bundling) of ports for optimal throughout. It is also good practice to setup CHAP authentication to protect that data as it crosses the network. Fiber channel is my preferred method, as it is fast and secure, but it is expensive. More often than not, you would require a fiber switch to connect the fabric to your hosts (unless you had a certain series of blade chassis).
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pgm554 earned 1000 total points
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Is iSCSI is reliable?yup


What are advantages/disadvantages to fiber channel?

 fibre can go longer lengths without a repeater and it does not have the overhead of tcp/ip as a protocol.

It is also faster and can be made redundant through fibre channel arbitrated loop

Fibre is more expensive to implement,while TP copper is not.

If you want hands down state of the art ,fibre.
If you want good solid performance at a price point,iscsi.
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by:fireguy1125
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thanks, what would be the overhead with tcp/ip?
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by:pgm554
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Depends.
If you use what is referred to as jumbo packets,you can get a pretty good throughput on a GIGe network,but all network devices must support the size frame you set.

http://pic.dhe.ibm.com/infocenter/iseries/v7r1m0/index.jsp?topic=%2Frzahq%2Fmtuconsiderations.htm

http://www.youtube.com/watch?v=Sylnsg4jQ0s
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