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Over the past two weeks, I've written about some of the commonly overlooked aspects of building a bulletproof IP storage network and how to best use that network with NFS. This week, I'll show you the ins and outs of configuring iSCSI for performance and redundancy, as well as how it compares with NFS.
The first thing to understand is that although NFS and iSCSI are both IP storage protocols supported by many server operating systems and hypervisors, that's about as far as the similarity between the two extends. NFS is a high-performance file-sharing protocol in the same vein as SMB/CIFS, while iSCSI is a block-level storage protocol more akin to Fibre Channel in that it encapsulates raw SCSI commands. This distinction is important because it has significant bearing on how you get redundancy and performance scalability.
iSCSI vs. NFS on the network: How they differ
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