VMFS Datastores can be stored onlocal stroage ,FC SAN or iSCSI SAN.You can store VM's on NFS NAS but that doesnt use VMFS.
PSA :Pluggable Storage Architecture is a special layer of VMkernal making maltipathing flexible and allows
3rd party mutipathing plugins (MPP).PSA takes effect when VMkernal sendsa SCSI command to access data on block device.
MPP:Multi pathing Plugins ( Like EMC Power path)
NMP:Native multipathing plugin is the VMware NMP(Native mutipathing plugin).NMP manages subplugins SATP and PSP
SATP:Storage Array Type Plugins knows how to comminicate with stroage arrays
PSP:Path selection Plugins takes the path to get to the stroage arrays
ALUA:
Notes :
MPP and NMP can coexist and can be used on a LUN or per array basis.
MPP or NMP job is to discover physical Stroage Devices and determine the "Claim rules" to export the logical device.Claimrule are found in /etc/vmware/esx.conf.Path failover is delegated to SATP.Path Load Balancing is delegated to PSP.
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