IP Storage Working Group Internet Draft M. Krueger M. Chadalapaka R. Elliott Document: draft-ietf-ips-iSCSI-name-ext-02.txt Hewlett-Packard Corp. Expires: July 2004 January 2004 NAA naming format for iSCSI Node Names Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026 [1]. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Abstract iSCSI is a SCSI transport protocol that maps the SCSI family of protocols onto TCP/IP. This document defines an additional iSCSI node name type format to enable use of the "Network Address Authority" (NAA) world wide naming format used by ANSI T11 Fibre Channel (FC) protocols. Conventions used in this document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC-2119 [2]. Table of Contents Krueger Expires - July 2004 [Page 1] iSCSI NAA Naming Format January 2004 1. Introduction...................................................2 2. Motivation.....................................................2 3. iSCSI Name Structure...........................................3 3.1 Type "naa." - Network Address Authority....................3 4. Terminology....................................................4 4.1 IQN........................................................4 4.2 SRP........................................................4 4.3 SAS........................................................4 4.4 NAA........................................................4 4.5 InfiniBand.................................................4 Security Considerations...........................................4 References........................................................5 Author Addresses..................................................6 1. Introduction This document discusses the motivation for adding an NAA type format as an iSCSI node name format and defines this format in accordance with the iSCSI naming conventions conventions [iSCSI]. It is hoped that defining this format would enable storage devices containing both iSCSI and FC ports to use the same NAA-based SCSI device name. 2. Motivation To date, there are a number of networked transports providing port services to SCSI. These transports all incorporate some form of world-wide unique name construction format. SCSI transport protocol Name Format ----------------------------------------------- | | EUI-64| NAA |IQN | |----------------------------|-------|-----|----| | iSCSI (Internet SCSI) | X | | X | |----------------------------|-------|-----|----| | FCP (Fibre Channel) | | X | | |----------------------------|-------|-----|----| | SAS (Serial Attached SCSI) | | X | | |----------------------------|-------|-----|----| | SRP (for InfiniBand) | X | | | ----------------------------------------------- The NAA format is used by the Fibre Channel transport and the SAS protocol made a recent decision to use NAA identifier formats. This makes the NAA format the most commonly used identifier format for SCSI transports. Although one of the T11-defined NAA formats Krueger Expires - July 2004 [Page 2] iSCSI NAA Naming Format January 2004 contains a mapping of EUI-64 numbers, it requires some mathematical manipulation to extract the EUI-64 identifier out of this format, and the NAA EUI-64 mapping reserves 2 bits in the EUI-64 identifier, thereby reducing the EUI-64 namespace. If iSCSI included a naming format that allowed direct representation of an NAA-format name, it would facilitate construction of a target device name that translates easily across multiple namespaces for a storage device containing ports served by different transports. This document proposes adding an NAA type to the iSCSI naming formats in order to enable economy of worldwide-unique identifier assignment for multi-transport-enabled target devices: One NAA identifier can be assigned as the basis for the SCSI device name for a target having SAS SCSI ports, FC SCSI ports and iSCSI SCSI ports. [Note: Today, FCP-2 does not have a dependable notion of SCSI device name [SAM3]. It is however expected that FCP-3 is likely to incorporate the idea of a device name, or platform name, subject to T10Ęs decisions. If it does embrace the device name notion, the same NAA format could then form the basis for targets with SAS/FCP-3/iSCSI ports.] T10 has defined a SCSI target device name in [SPC3] that is reported in the VPD page 83 device identifier page. Addition of the ANSI T11-defined NAA format as an allowed type for iSCSI name creation would make the iSCSI device naming format more palatable across all current SCSI networked transports, allowing the creation of SCSI device names that are transport-independent. This would facilitate the creation of LU names based on this SCSI device name. The T11 NAA formatted as an ASCII-hexadecimal representation has a maximum size of 32 characters (128 bit formats) - as a result there is no issue with this name format exceeding the maximum size for iSCSI node names. 3. iSCSI Name Structure In addition to the iSCSI name types of "iqn." and "eui." type "naa." - the remainder of the string is an ANSI T10 defined Network Address Authority identifier in ASCII-encoded hexadecimal. 3.1 Type "naa." - Network Address Authority The ANSI T10 FC-FS specification defines a format for constructing globally unique identifiers [FC-FS] referred to as an Network Address Authority (NAA) format. The iSCSI name format is "naa." followed by an NAA identifier (ASCII- encoded hexadecimal digits). Krueger Expires - July 2004 [Page 3] iSCSI NAA Naming Format January 2004 Example iSCSI name with a 64-bit NAA value: Type NAA identifier (ASCII-encoded hexadecimal) +--++--------------+ | || | naa.52004567BA64678D Example iSCSI name with a 128-bit NAA value: Type NAA identifier (ASCII-encoded hexadecimal) +--++------------------------------+ | || | naa.62004567BA64678D0123456789ABCDEF The NAA iSCSI name format might be used in an implementation where the structure for generating FC NAA worldwide unique names is already in place because the device contains both Fibre Channel and iSCSI SCSI ports. 4. Terminology 4.1 IQN iSCSI qualified name, an identifier format defined by the iSCSI protocol [iSCSI]. 4.2 SRP SCSI RDMA Protocol. SRP defines a SCSI protocol mapping onto the InfiniBand (tm) Architecture and/or functionally similar cluster protocols [SRP]. 4.3 SAS Serial Attached SCSI. The Serial Attached SCSI (SAS) draft standard contains both a physical Layer that is compatible with Serial ATA and protocols for transporting SCSI commands to SAS devices and for transporting ATA commands to SATA devices [SAS]. 4.4 NAA Network Address Authority - a naming format defined by the ANSI T11 Fibre Channel protocols [FC-FS]. 4.5 InfiniBand An I/O architecture intended to replace PCI and address high performance server interconnect [IB]. Security Considerations Because this document does not define any new wire protocol, there are no additional security considerations for the iSCSI protocol. Krueger Expires - July 2004 [Page 4] iSCSI NAA Naming Format January 2004 References Normative References 1 Bradner, S., "The Internet Standards Process -- Revision 3", BCP 9, RFC 2026, October 1996. 2 Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997 [iSCSI] Satran, J., Meth, K., Sapuntzakis, C.,Chadalapaka, M., Zeidner, E., "iSCSI", Internet draft (work in progress), draft- ietf-ips-iscsi-20.txt, January 2003. Informative References [SPC3] T10/1416-D, SCSI Primary Commands - 3 (SPC-3). [SAM3] T10/1561-D, SCSI Architecture Model - 3 (SAM-3). [FC-FS] T11/02-018v1 - dpANS - Fibre Channel Framing and Signaling Interface. [IB] InfiniBand{tm} Architecture Specification, Vol. 1, Rel. 1.0.a, InfiniBand Trade Association (www.infinibandta.org). [SRP] INCITS.365:2002, SCSI RDMA Protocol (SRP). [SAS] T10/1562-D, Serial Attached SCSI (SAS). Krueger Expires - July 2004 [Page 5] iSCSI NAA Naming Format January 2004 Author Addresses Marjorie Krueger Hewlett-Packard Company 8000 Foothills Blvd. Roseville, CA 95747-5668, USA Mallikarjun Chadalapaka Hewlett-Packard Company 8000 Foothills Blvd. Roseville, CA 95747-5668, USA Rob Elliott Hewlett-Packard Company MC 150801 PO Box 692000 Houston, TX 77269-2000 USA Krueger Expires - July 2004 [Page 6]