John L. Hufferd, Brocade Ahmad Zamer, Intel

47 Pages·2008·1.71 MB·English

IP Storage Protocols: iSCSI
John L. Hufferd, Brocade
Ahmad Zamer, Intel
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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
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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
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Agenda
Introduction
iSCSI Features
Error handling, Boot, Discovery
iSCSI usage models
iSCSI Security
Q & A
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Agenda
Introduction
iSCSI Features
Error Handling, Boot, Discovery
iSCSI usage models
iSCSI Security
Q & A
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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
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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
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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.
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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.)
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