18. #VMware Administration v6.7 -  SAN  Storage - iSCSI Operations - Part 3
Channel: Srinivas Maganti
Date: 2020-04-06

VMware offers and supports a number of different storage technologies and protocols for presenting external storage devices to VMware vSphere® hosts. In recent years, the iSCSI protocol has gained popularity as a
method for presenting block storage devices over a network to vSphere hosts. VMware has provided support for iSCSI storage since Virtual Infrastructure 3. This paper can help you understand the design considerations and deployment options for deploying vSphere infrastructures using iSCSI storage. It highlights trade-offs and factors to consider when deploying iSCSI storage to support vSphere environments. It is a complement to, not a replacement for, VMware® product documentation. 
One major difference between iSCSI and FC relates to I/O congestion. When an iSCSI path is overloaded, the TCP/IP protocol drops packets and requires them to be resent. FC communication over a dedicated path has a built-in pause mechanism when congestion occurs. When a network path carrying iSCSI storage traffic is oversubscribed, a bad situation quickly grows worse and performance further degrades as dropped packets must be resent. There can be multiple reasons for an iSCSI path being overloaded, ranging from oversubscription (too much traffic), to network switches that have a low port buffer.

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https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/whitepaper/iscsi_design_deploy-whitepaper.pdf
https://www.mavrickcloud.com/blogs/
https://github.com/maverick-cloud/
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