IP Storage Protocols: iSCSI John L. Hufferd, Brocade Ahmad Zamer, Intel SNIA Legal Notice The material contained in this tutorial is copyrighted by the SNIA. Member companies and individuals may use this material in presentations and literature under the following conditions: Any slide or slides used must be reproduced without modification The SNIA must be acknowledged as source of any material used in the body of any document containing material from these presentations. This presentation is a project of the SNIA Education Committee. IP Storage Protocols: iSCSI 2 ©2008 Storage Networking Industry Association. All Rights Reserved. Abstract IP Storage Protocols: iSCSI This session will explain the various parts of iSCSI Network encapsulations of iSCSI PDUs Session Relationship to SCSI and TCP/IP Connections iSCSI flow from Initiator to Target Error Recovery, Discovery and Security It will also explain Companion Processes Boot SLP iSNS And the session will describe iSCSI Environments From the small office, to the High End Enterprise This session is appropriate for end user and developers of iSCSI technologies IP Storage Protocols: iSCSI 3 ©2008 Storage Networking Industry Association. All Rights Reserved. Terms iSCSI - Internet SCSI NAS - Network Attached Storage Supports CIFS (Common Internet File System) protocols Supports NFS (Network File System) protocols FAN – File Area Networks Utilize IP Networks and NAS protocols HBA - Host Bus Adapter TOE - TCP/IP Offload Engine FC - Fibre Channel SAN - Storage Area Network Supports Block Storage Protocols (FC and iSCSI) iSAN – A Storage Area Network made up of iSCSI connections PDU - Protocol Data Unit IP Storage Protocols: iSCSI 4 ©2008 Storage Networking Industry Association. All Rights Reserved. Agenda Introduction iSCSI Features Error handling, Boot, Discovery iSCSI usage models iSCSI Security Q & A IP Storage Protocols: iSCSI 5 ©2008 Storage Networking Industry Association. All Rights Reserved. Agenda Introduction iSCSI Features Error Handling, Boot, Discovery iSCSI usage models iSCSI Security Q & A IP Storage Protocols: iSCSI 6 ©2008 Storage Networking Industry Association. All Rights Reserved. Small Computer System Interconnect (SCSI) Legacy Printers Scanners SCSI BUS (Being replaced by Serial-SCSI for single system storage connections) Tapes ATA Disk There are 2 main hard drive interface classes available today: Desktop / Server •ATA (used mostly in desktop and laptop systems) Computer •Includes SATA which is becoming a larger presence in SCSI Disks server class systems/arrays •SCSI (used in server-class systems) • includes PSCSI, FC & SAS Note: ATA and SCSI drives with Serial attachments are called SATA and SAS IP Storage Protocols: iSCSI 7 ©2008 Storage Networking Industry Association. All Rights Reserved. Systems with SCSI over Networks Application Application Application File System File System File System Fibre Channel Storage Area Network (SAN) or With Block I/O iSCSI Both Fibre Channel and iSCSI can makeup a SAN Replaces shared bus with switched fabric IP Storage Protocols: iSCSI 8 ©2008 Storage Networking Industry Association. All Rights Reserved. iSCSI is: Internet SCSI: internet Small Computer System Interconnect iSCSI is a SCSI transport protocol for mapping of block-oriented storage data over TCP/IP networks The iSCSI protocol enables universal access to storage devices and Storage Area Networks (SANs) over standard TCP/IP networks On Ethernet LANs: Copper & Optical On ATM WANs On SONET WANs Wireless Etc. IP Storage Protocols: iSCSI 9 ©2008 Storage Networking Industry Association. All Rights Reserved. Data Encapsulation Into Network Packets Ethernet SCSI Optional IP TCP iSCSI CRC Header Cmds DATA iSCSI Protocol Data Unit (PDU): Provides ordering and control information. Contains iSCSI control info, with optional SCSI Commands &/or Data Provides Reliable data transport and delivery (TCP Windows, ACKs, ordering, etc.) Also demux within node (port numbers) Provides IP “routing” capability so that packet can find its way through the network Provides physical network capability (Cat 5, MAC, etc.) IP Storage Protocols: iSCSI 10 ©2008 Storage Networking Industry Association. All Rights Reserved.