iSCSI Naming

1
iSCSI Naming Discovery Team StatusIETF
December 2000

• Mark Bakke, Cisco
• Joe Czap, IBM
• Jim Hafner, IBM
• Howard Hall, Pirus
• Jack Harwood, EMC

John Hufferd, IBM Yaron Klein, Sanrad Lawrence
Lamers, San Valley Joshua Tseng, Nishan Kaladhar
Voruganti, IBM
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Naming and Addressing Requirements

• Each target or initiator has
• One name - world-wide unique identifier
• One or more addresses paths to find target or
  initiator
• An address can represent multiple targets
• iSCSI target name or TCP port can multiplex them
• A target may be represented by multiple addresses
• An initiator may use multiple addresses
• LU addressing is covered by SCSI, not iSCSI

3
Target Addressing

• IP Address TCP Port Target Name (URL-like)
• IP Address can serve multiple TCP ports
• IP Address Port can serve multiple target names
• Default canonical port registered with IANA
• Default path is blank, or something like iscsi.
• Each layer has its own address and muxing
• bigarray.ietf.org4000/my_disk_target

4
World-Wide Unique Identifier

• WWUI represents a target or initiator, not a port
• Identical regardless of path
• Used for authentication of targets and initiators
• Should not be tied to interface hardware
• Stable for long periods of time
• Hierarchical format, with naming authority
• Must specify size limit and encoding scheme

5
Discovery Requirements

• Find targets by querying a target address
• Tell me which targets you have that I should
  see
• Find targets by querying a SNS
• Targets register with or discovered by storage
  director
• Find targets and/or SNS by multicast
• Scaling requirements
• Small environments do not require SNS
• Large environments use SNS to scale
• Target redirect responses allow a target to be
  moved to a different address

6
Work Items / Next Steps

• Name Service interfaces for use by initiators and
  targets
• Name Service interaction with authentication
• Format of the WWUI
• Naming Authority and local UI
• Character set allowed in WWUI Unicode?
• Recommended UI schemes for naming authorities
• WWUI interaction with authentication and iSCSI
  login
• Secure interaction between initiators, targets,
  and name service