SCSI target - Factbites

SCSI target - Factbites
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Topic: SCSI target

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	SCSI pinouts, SCSI interface, parallel interface, SCSI-1, SCSI-2, SCSI-3
		Because of the definition of SCSI that a job is given by a initiator and then carried out by a target without the initiator knowing how the target is doing it and even not knowing when the job is done the roles of initiator and target may switch.
		The SCSI interface is a parallel interface, which means the data is not send one bit after another, but several bits over several lines at the same time.
		In SCSI there is also active termination, which means the termination is done by a voltage regulator and some resitors.
	www.connectworld.net /scsi.html

	Storage Interfaces Standards SCSI
		Unfortunately, today's SCSI architectures lack a reliable mechanism for detecting corruption of the data generated by the host/server and written to the target and corruption of data retrieved from the target by the host.
		Beyond the 2-TB SCSI Logical Unit (Dell)- This white paper discusses the 2-TB logical unit limitation and the changes to the SCSI protocol and x86 disk partitioning scheme that are under way.
		SCSI, the Small Computer System Interface, is a set of ANSI (American National Standards Institute) standard electronic interfaces that allow personal computers to communicate with peripheral hardware faster and more flexibly than previous interfaces.
	storage.ittoolbox.com /nav/t.asp?t=395&p=395&h1=395

	RFC 3720 - Internet Small Computer Systems Interface (iSCSI)
		Data Transfer Overview Outgoing SCSI data (initiator to target user data or command parameters) is sent as either solicited data or unsolicited data.
		The target MUST return Ready To Transfer (R2T), if any, and the status over the same TCP connection that was used to deliver the SCSI command.
		Target tags are not strictly specified by the protocol.
	www.rfc-repository.com /getrfc.php?rfc=3720

	SCSI
		Certain SCSI bus functions are assi,-ned to the initiator and certain SCSI bus functions are assigned to the target.
		SCSI devices shall detect the Bus Free Phase after SEL and BSY are both false for at least a bus settle delay.
		SCSI devices shall release all SCSI bus signals hin a bus clear delay after BSY and SEI, become continuously false fbr a bus settle delay.
	www.ba-stuttgart.de /~schulte/htme/ebuss12.htm (10096 words)

	SCSI glossary, practical definitions and terminologies for SCSI
		A result of the "intelligence" of SCSI that allows an initiator or target to disconnect from the bus while it is performing a task, such as locating some information at a specific address, and, once it has located the information, reconnect to the bus in order to complete its task.
		SCSI messages are used during the command transfer to negotiate the fast and wide transfer options for the data transfer.
		The SCSI command and data phases are reduced from a seven to a three phase process and then further combines the status phase and message phase that occur after a data transfer.
	www.paralan.com /glos.html (7501 words)

	Encyclopedia topic: Target
		Target is a commune (The smallest administrative district of several European countries) of the Allier (additional info and facts about Allier) département (additional info and facts about département) in France (A republic in western Europe; the largest country wholly in Europe)
		A conservation target, usually specific biodiversity targets (e.g., species, ecological communities, and ecological systems) that an conservation organization has chosen to concentrate on protecting.
		A SCSI (Interface consisting of a standard port between a computer and its peripherals that is used in some computers) endpoint
	www.absoluteastronomy.com /encyclopedia/t/ta/target.htm (235 words)

	IBM Redbooks IBM TotalStorage SAN - What, More Protocols?
		Internet SCSI (iSCSI) is a transport protocol that carries SCSI commands from an initiator to a target.
		SCSI data and commands are encapsulated in TCP/IP packets.
		By eliminating the need for a second network technology just for storage, iSCSI can lower the costs of deploying networked storage and increase its potential market.
	www.redbooks.ibm.com /abstracts/TIPS0560.html?Open (235 words)

	SCSI-2 Differential Fast/Wide
		Narrow SCSI devices support 8 possible SCSI ID values; therefore, up to 7 narrow SCSI devices can be connected to the internal or external SCSI busses in any combination using the remaining ID values.
		If the target expansion card is an older card, it may not be able to process commands or data from the busmaster fast enough, and when queried by the busmaster, it replies with "not ready".
		The internal SE port is capable of addressing up to seven SE SCSI devices and the differential external port is capable of addressing up to seven differential SCSI devices, providing a maximum of 14 devices per adapter.
	ohlandl.kev009.com /IBM_SCSI/SCSI-DFW.html (235 words)

	SCSI Glossary: Practical Definitions and Terminologies for SCSI
		A result of the "intelligence" of SCSI that allows an initiator or target to disconnect from the bus while it is performing a task, such as locating some information at a specific address, and, once it has located the information, reconnect to the bus in order to complete its task.
		SCSI messages are used during the command transfer to negotiate the fast and wide transfer options for the data transfer.
		The SCSI command and data phases are reduced from a seven to a three phase process and then further combines the status phase and message phase that occur after a data transfer.
	www.paralan.com /glos.html (235 words)

	Expanding the SCSI bus
		But in some larger SCSI configurations, where large banks of devices must be accessed, SCSI's total target/initiator devices in the narrow SCSI bus (8 devices) and wide SCSI bus (16 devices) are viewed as a limitation.
		The SCSI interface is projected by most industry analysts to maintain its hold on the mass storage market through the year 2005.
		The parallel SCSI interface has increased in speed while using the same physical transmission mediums defined when the bus was more than 10 times slower.
	www.shiloff.org /scsi (235 words)

	Maxtor Showcases Engineering Samples of Serial Attached SCSI Drives At HP World 2003
		Building on the company's accomplishments in being first to market with the previous three generations of SCSI interfaces, Maxtor engineers were able to successfully initialize the target device, execute SCSI commands, and read and write data across the interface.
		For more information on Serial Attached SCSI, please refer to the Maxtor website at: http://www.maxtor.com/en/technologies/serial_attached_scsi/index.htm About Maxtor Corporation Maxtor Corporation (http://www.maxtor.com) is one of the world's leading suppliers of information storage solutions.
		Demonstrates Serial Storage in the Box with SAS and SATA Drives in One System HP WORLD, ATLANTA, Aug. 12 /PRNewswire-FirstCall/ -- Maxtor Corporation (NYSE: MXO) announced that it will show its first engineering sample units of its Serial Attached SCSI (SAS) hard drives at HP World 2003.
	www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/08-12-2003/0001999164&EDATE= (612 words)

	SCSI Glossary: Practical Definitions and Terminologies for SCSI
		SCSI messages are used during the command transfer to negotiate the fast and wide transfer options for the data transfer.
		The SCSI command and data phases are reduced from a seven to a three phase process and then further combines the status phase and message phase that occur after a data transfer.
		Once the host adapter (initiator) has located a peripheral and negotiated a data transfer rate, the initiator sends a Write Buffer command to the target at that negotiated data transfer rate and then reads it back to determine if what it reads is what it wrote.
	www.paralan.com /glos.html (612 words)

	Проект OpenNet: MAN glm (7) Макропакеты и соглашения (FreeBSD и Linux)
		glm supports these properties which can be modified by the user: scsi-options, target-scsi-options, scsi- reset-delay, scsi-tag-age-limit, scsi-watchdog-tick, and scsi-initiator-id. target-scsi-options overrides the scsi-options property value for target.
		The glm driver exports properties indicating per target the negotiated transfer speed (target-sync-speed), whether wide bus is supported (target-wide), for that particular target (target-scsi-options), and whether tagged queuing has been enabled (target-TQ).
		The following example disables an option for one specific glm (refer to driver.conf(4) and pci(4) for more details): name="glm" parent="/pci@1f,4000" unit-address="3" target1-scsi-options=0x58 scsi-options=0x178 scsi-initiator-id=6; Note that the default initiator ID in OBP is 7 and that the change to ID 6 will occur at attach time.
	www.linux.opennet.ru /man.shtml?topic=glm&category=7&russian=4 (1220 words)

	Roxen Community: RFC 3980 T11 Network Address Authority (NAA) Naming Format for iSCSI Node Names (Standards Track)
		This document defines an NAA type iSCSI naming format so that one NAA identifier can be assigned as the basis for the SCSI device name for a SCSI target with both SAS ports and iSCSI ports.
		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 SCSI storage device containing ports served by different transports.
		The iSCSI NAA naming format might be used in an implementation when the infrastructure for generating NAA worldwide unique names is already in place because the device contains both SAS and iSCSI SCSI ports.
	community.roxen.com /developers/idocs/rfc/rfc3980.html (1063 words)

	Manual page for dsa(7D)
		The DSA controller is target 0 on the SCSI bus but should be set up to appear as target 7 in the emulation mappings.
		Note that although the DSA controller is physically connected to SCSI devices, the interface to composite drives is that of a direct access disk "dadk." There is no way to send SCSI commands to composite drives on a DSA controller.
		If the DSA controller is used for Solaris x86 CD installation, the CD must be mapped at the proper target, which cannot be 0.
	www.cs.utk.edu /~cs460.is&r/cgi-bin/group4/collection/dsa.7d.html (391 words)

	qla2300.conf
		# # - For target devices, if no Persistent Name Binding entries are # specified, the default SCSI target IDs assigned will be the loop # ID of the devices, if failover is disabled else will start at 0.
		Absence of # this entry for any given device name or SCSI ID does not direct # the driver to perform any type of device masking, unless the # "Persistent Binding Only Option" is set.
		In other # words, this entry changes the target ID of the specified device # to the number specified in the entry.
	www.vicengle.org /configs/qla2300.conf (925 words)

	Rancho.com - SCSI Converters, SCSI Expanders, SCSI Extenders, SCSI Switch, SAS Expander, Fibre Channel, Gigabit Ethernet
		This SAS expander provides functionality for connecting targets and initiators with up to 12 phys integrated for SAS initiator, SAS target, SAS expander, or Serial ATA (SATA) target devices.
		Rancho's RTSASR-12X is a 12-port, 3 Gigabit Serial Attached SCSI (SAS) expander.
		By incorporating dual SAS expanders, this unit is capable of supporting up to 4 x 3.5" dual port SAS drives or 4 x 3.5" SATA drives with total redundancy.
	www.rancho.com (480 words)

	Re: SANE and UMAX scanner on MESH
		* Should I be worried that the kernel says "mesh: target 6 aborted" when booting, and doesn't list the scanner in /proc/scsi/scsi?
		Here's > what is reported during the scsi init at boot time (from dmesg): > > scsi0 : MESH > scsi : 1 host.
		Can Linux not detect a scanner > on PPC, or perhaps, is there a problem with generic SCSI on MESH?
	lists.debian.org /debian-powerpc/1999/debian-powerpc-199910/msg00070.html (480 words)

	88580.031023&ELEMENT_SET=DECL
		The sequence of messages occurs when a SCSI host 14 acts as an initiator 50, and an FCP device 34 acts as a target 52, for an initial login procedure between the initiator and the target.
		4 is a diagram illustrating a sequence of messages occurring between initiator 50 and target 52, according to a preferred embodiment of the present invention.
		illustrating a sequence of messages occurring between initiator 50 and target 52, according to a preferred embodiment of the present invention.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/88580.031023&ELEMENT_SET=DECL (4219 words)

	Linux sg3_utils package
		The SCSI generic (sg) interface still represents a cleaner interface than the primary device names since the drivers behind primary device names have their own policies, may interfere with error processing and in some cases run their own state machines.
		The sg_map utility shows the mapping between scsi generic (sg) devices and the corresponding primary device node.
		Unix dd command variant, uses SG_IO ioctl to send SCSI commands to do reads and writes when instructed.
	sg.torque.net /sg/u_index.html (4219 words)

	sane-mustek.5
		For Mustek scanners, it is typically necessary to configure the low- level SCSI driver to disable synchronous transfers (sync negotiation), tagged command queuing, and target disconnects.
		For SCSI scanners, the special device name must be a generic SCSI device or a symlink to such a device.
		Mustek SCSI scanners are typically delivered with an ISA SCSI adapter.
	sane.alioth.debian.org /man/sane-mustek.5.html (4219 words)

	#103981-18: SunOS 5.5.1: glm driver patch
		4028993 glm: support 22802/8751D differential Symbios scsi cards 4030554 glm: a scsi pkt to an un-inited/probed target will panic glm.
		1254828 glm: hangs after connected cmd timeout 4010563 glm: fixes required for quark/tazmo from 2.6 (from 103981-01) 1238356 glm does not respond properly to target initiated synchronous negotiation.
		1238356 glm does not respond properly to target initiated synchronous negotiation.
	sunsolve.sun.com /search/document.do?assetkey=1-21-103981-18-1 (707 words)

	Raid bug spray
		Learn about StraightLine products iSCSI Bridge, RAID, Target Engine, and Target Board.
		Pro-Tape Systems is proud to partner with NitroAV in offering the latest in Firewire 800 drives and accessories, 23GB DVD Equipment and Firewire and SCSI RAIDS optimized for the most demanding digital video and audio use yet amazingly affordable.
		SCSI, Fibre, USB/Firewire host with SCSI, Fibre, IDE or SATA disk drives.
	www.celts.dk /raid--raid-bug-spray (707 words)

	AMIDiag - Industry Standard PC Diagnostics
		A process when a SCSI target can send unsolicited sense information to an initiator using the SCSI SEND command.
		Data transfer (usually at a low rate and independent of any external timing constraints) performed by a SCSI device involving the interlocking of a signal to the initiator (REQ) and a signal to the target (ACK) such that each step of the data transfer protocol must occur before the next step can begin.
		Clustering is a popular strategy for implementing parallel processing applications because it enables companies to leverage the investment already made in PCs and workstations.
	www.amidiag.com /support/glossary.cfm (707 words)

	AMCC: Sales and Support
		The target driver (fcaw) will respond by single-threading all subsequent I/O, which has a negative impact on performance (when Solaris overloads the target with commands, the target will reject subsequent SCSI commands because its internal queues will register as full.
		Drivers for the SBus adapters (fcaw) will only attach to an adapter with FCode which specifying the device-type property as SCSI, and the name property as fcaw.
		This variable should be set to a value less than, or equal to the maximum queue depth of each LUN connected to each instance of the sd driver (consult your array vendor and ask them "what is the queue depth of this product"?).
	www.amcc.com /webdev/Stage/Sales/faq_SBus_to_Fibre.cfm (707 words)

	Rancho.com - SCSI Converters, SCSI Expanders, SCSI Extenders, SCSI Switch, SAS Expander, Fibre Channel, Gigabit Ethernet
		RTLVD-HVDCD - Dual Port Compact PCI Multimode SCSI Converter Blade, featuring 2 independent channels, LVD/SE to HVD SCSI buses.
		Up to 40 Mbytes/second with target or initiator on either side
		Multimode Low Voltage Differential (LVD) to High Voltage Differential (HVD) SCSI Converters
	www.rancho.com (707 words)

	iSCSI: All you need to know about iSCSI
		iSCSI Target: The iSCSI target is the storage device itself or an appliance that controls and serves volumes or virtual volumes.
		NFS and CIFS were designed to transfer complete files (as in NAS), while iSCSI was designed to transfer data between servers and storage systems at the block level (as in SAN), similar to how servers read and write to internal disk drives.
		The ease of use of iSCSI and the vast support from different OSâs enable the easy transfer of complete volumes from one host to the other as needed, without investing in additional infrastructure or complicated management schemes.
	www.sanrad.com /iscsi.asp?IP-SAN=231 (1034 words)

	SCSI Glossary: Practical Definitions and Terminologies for SCSI
		Typically a SCSI peripheral device is the target but a host adapter may, in some cases, be a target.
		Uses only a 110 ohm resistor from the regulator to the signal line which is a much closer match to the SCSI cable impedance.
		In SCSI systems, this electrical circuitry is called a terminator.
	www.paralan.com /glos.html (1034 words)

	What is SCSI?
		This is done by means of the SCSI or target ID. Each device has a unique target ID. You can select the ID to which a device must respond using a set of jumpers, or a dip switch, or something similar.
		But if you have external terminators, or when the device supplying the terminator power to the SCSI bus line is switched off you are in trouble.
		There is much debate going on if and when you should switch from simple resistor (passive) terminators to active terminators.
	www.freebsd.org /doc/en_US.ISO8859-1/articles/storage-devices/scsi.html (1034 words)

	Broadmining: LUN
		The term originated in the SCSI protocol as a way of differentiating individual disk drives within a common SCSI target device like a disk array.
		For example, "c1t2d3s4" would refer to controller 1, target 2, disk 3, slice 4.
		In computer storage, a logical unit number or LUN is an address for an individual disk drive and by extension, the disk device itself.
	www.lowide.com /LUN (1034 words)

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In the News (Fri 25 Dec 09)