Escon (EA): Mainframe interface
Ficon (EF): Enhanced ESCON mainframe interface
Fibre(FA/DA): Open System host interface or Fibre Disk Adapter
GigE (RE): Multi-mode SRDF connection
iSCSI (SE): Multi-mode host connection
Open Systems hosts use Fixed Block Architecture (FBA)
– Each block is a fixed size of 512 bytes
– Volume size referred to by the number of Cylinders
– Each Cylinder has 15 tracks
– Each track has 64 blocks on DMX-2 32 KB size
– Each track has 128 blocks on DMX-3 64KB size
Mainframes use Count Key Data (CKD) 57KB size
– Count field indicates the data record’s physical location (cylinder and head)
record number, key length, and data length
– Key field is optional and contains information used by the application
– Data field is the area which contains the user data
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