SCSI command - Factbites

SCSI command - Factbites
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Topic: SCSI command

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	SCSI - Wikipedia, the free encyclopedia
		SCSI stands for "Small Computer System Interface", and is a standard interface and command set for transferring data between devices on both internal and external computer buses.
		This change divorces SCSI's various interfaces from the command set, allowing devices that support SCSI commands to use any interface (including ones not otherwise specified by T10), and also allowing the interfaces that are defined by T10 to develop on their own terms.
		SCSI is most commonly used for hard disks and tape storage devices, but also connects a wide range of other devices, including scanners, printers, CD-ROM drives, CD recorders, and DVD drives.
	en.wikipedia.org /wiki/SCSI (2377 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 (2377 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.
		A result of the "intelligence" of SCSI that allows a device 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.
	www.paralan.com /glos.html (7501 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.
		A result of the "intelligence" of SCSI that allows a device 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.
	www.paralan.com /glos.html (7501 words)

	Is native SATA same as ncq SATA : LinuxQuestions.org time based Linux archive
		NCQ (Native Command Queuing) is another name to queue a dozen jobs to the hard drive to access multiple files at once in a single head swipe.
		NCQ has nothing to do with SATA but it is a good feature for SATA to compete with SCSI.
		SCSI does this, so its not a new feature.
	www.linuxquestions.org /questions/archive/18/2004/10/1/236501 (807 words)

	Northern Sound Source - SATA VS. ATA~ Is there really a big difference?
		This technology is in use with SCSI drives for years - one of the reason why SCSI is still preferred in server-environments...
		The point simply is, the more multitasking is going on on a system, the more important NCQ is getting, as all those threads might want to access different files at the same time...
		If there are several IOs pending at the same time (like very common for streaming of multiple sounds at the same time), the SATA-controller and the disk may rearrange the order in which those are processed.
	northernsounds.com /forum/archive/index.php/t-19789.html (1330 words)

	comp.periphs.scsi FAQ part 1 of 2
		SCSI was broken up from a single document into different layers and command sets.
		SCSI devices share the bus bandwidth efficiently by allowing one device to transfer data while another is seeking or rewinding its media.
		SCSI allows process B's request to be completed ahead of process A's, which means that process B can be running sooner, so that the most expensive chip - the system CPU - tends to spend less time twiddling its thumbs.
	www.faqs.org /faqs/scsi-faq/part1 (17963 words)

	SCSI bus interface, standards and technical information
		The goal of the effort was to develop an interface that supported logical block addressing rather than head/cylinder/sector, 8-bit parallel data transfer instead of analog serial and generic commands rather than a couple of control lines.
		This includes the ability of devices to compete for the bus (arbitrate) and to free the bus (disconnect/reselect) temporarily during command execution.
		The roots of SCSI go back to 1979, when the disk drive manufacturer Shugart was looking for a new universal interface for future disk drives.
	www.scsilibrary.com (311 words)

	SCSI cards on STORAGEsearch.com
		Newer variations such as Serial Attached SCSI and Internet SCSI preserve compatibility at the SCSI driver and command set level, but offer different connection and routing methods.
		SCSI longevity has been due to the fact that it incorporates a handful of basic concepts which have been flexible enough to be expanded and adapted as new faster electronic interface technologies and devices came along.
		The performance of the SCSI connection has always enable state of the art disk I/O to be supported at hardware speeds.
	www.storagesearch.com /scsi.html (311 words)

	rfc3720-diffb.html
		SCSI data packets are matched to their corresponding SCSI commands by using tags specified in the protocol.
		SCSI targets perform residual count calculation to check how much data was actually transferred to or from the device by a command.
		The SCSI Initiator Port Name and SCSI Initiator Port Identifier are both defined to be the iSCSI Initiator Name together with (a) a label that identifies it as an initiator port name/identifier and (b) the ISID portion of the session identifier.
	www.mit.edu /afs/athena.mit.edu/reference/rfc/authors/rfc3720-diffb.html (311 words)

	SCSI - Wikipedia, the free encyclopedia
		SCSI stands for "Small Computer System Interface", and is a standard interface and command set for transferring data between devices on a computer bus.
		SCSI devices are generally backward-compatible, i.e., it is possible to connect an ultra-3 SCSI hard disk to an ultra-2 SCSI controller and use it (though with reduced speed and feature set).
		SCSI is most commonly used for hard disks and tape storage devices, but also connects a wide range of other devices, including scanners, CD-ROM drives, CD recorders, and DVD drives.
	en.wikipedia.org /wiki/SCSI (311 words)

	SCSI - a Whatis.com definition - see also: skuzzy
		The collection of SCSI-3 command sets is used not only for the SCSI-3 parallel interface but for additional parallel and serial protocols, including Fibre Channel, Serial Bus Protocol (used with the IEEE 1394 FireWire physical protocol), and the Serial Storage Protocol (SSP).
		SCSI allows up to 7 or 15 devices (depending on the bus width) to be connected to a single SCSI port in daisy-chain fashion.
		A single host adapter, in the form of a PC Card, can serve as a SCSI interface for a laptop, freeing up the parallel and serial ports for use with an external modem and printer while allowing other devices to be used in addition.
	searchstorage.techtarget.com /sDefinition/0,,sid5_gci212949,00.html (311 words)

	SystemCooling.com
		Command queueing is a performance enhancing technology that's been around for a long time but has been limited primarily to SCSI drives.
		With command queueing technology, the commands are reordered for faster access, so the data returned might be in the order 1,4,2,3,5.
		The newer implementation, called NCQ, or Native Command Queueing, is beginning to garner support in the industry, although at this point in time the only widely available supporting platform is based on Intel's 915 and 925 chipsets, and even then only on boards using the ICH6R Southbridge chip.
	www.systemcooling.com /maxtor_300gb-03.html (568 words)

	MAC address - Wikipedia, the free encyclopedia
		Resetting the adapter can be accomplished in script with the freely available command line utility 'devcon' from Microsoft, or from the adapters context menu in the Network Connections control panel applet.
		On broadcast networks such as Ethernet the MAC address allows each host to be uniquely identified and allows frames to be marked for specific hosts.
		Under Windows XP, the MAC address can be changed in the Ethernet adapter's Properties menu, in the Advanced tab, as "MAC Address", "Locally Administered Address", "Ethernet Address" or "Network Address".
	en.wikipedia.org /wiki/MAC_address (568 words)

	SCSI Revision Levels
		The Fibre Channel interface is completely different from parallel SCSI in that it is a serial interface, meaning command and data information is transmitted on one signal stream organized into packets.
		This is a Seagate specific term describing the basic structure of the SCSI firmware included with a Seagate disc drive and standing for Advanced SCSI Architecture, generation 2.
		For example, a comparable set of standards for a SCSI Fiber Channel interface disc drive replaces the physical and protocol layers with new documents but uses the same documents for the other 3 layers.
	www.seagate.com /support/kb/disc/scsirev.html (568 words)

	Hardware Knowledgebase - What is NCQ (Native Command Queueing) and Why do we want it? - HardwareFAQs: powered by neofaq
		The inital statement about SCSI drives having Native Command Queuing is not accurate because they have something different called Tagged Command Queuing.
		This is where NCQ comes in - NCQ can rearrange the order of instructions so instead of moving from the outer track to the inner track, both pieces of data may be read from the outer track first before tackling the inner track.
		NCQ requires both controller and hard disk support, so unfortunately NCQ will not work on most SATA drives today but most disk manufacturers will support NCQ in the very near future.
	www.neoseeker.com /Hardware/faqs/kb/15,71.html (1643 words)

	Serial ATA - Wikipedia, the free encyclopedia
		SATA drives may be plugged into Serial Attached SCSI (SAS) controllers and communicate on the same physical cable as native SAS disks.
		Features allowed for by SATA but not by PATA include hot-swapping and native command queueing.
		To ease their transition to Serial ATA, many manufacturers have produced drives which use controllers largely identical to those on their PATA drives and include a bridge chip on the logic board.
	en.wikipedia.org /wiki/SATA (1138 words)

	Geek.com Geek News - Maxtor releases beefed-up 300 GB drives
		Native Command Queueing NCQ is a limited version of the command queueing tech that has long been used in enterprise scsi drives.
		The new drives will come with sizes up to 300 GB, utilize a 16 MB buffer, support Native Command Queuing (NCQ), and rotate with a speed of 7200 RPMs.
		It allows the drive to reorder data requests from the host in whatever order is quickest based on how the data is physically arranged on the drive media.
	www.geek.com /news/geeknews/2004Aug/wbc20040817026512.htm (1562 words)

	Common Command Set - Computing Reference - eLook.org
		Rather than delay the SCSI standard, X3T9.2 formed an ad hoc group to define CCS.
		Common Command Set - Computing Reference - eLook.org
	www.elook.org /computing/common-command-set.htm (61 words)

	LWN: Patch: Serial Attached SCSI (SAS) support for the Linux kernel
		A SAS LLDD should implement the Execute Command SCSI RPC and at least one SCSI TMF (Task Management Function), in order for the SAS Layer to communicate with the SAS LLDD.
		Expanders are _not_ SAS devices, and thus are _not_ SCSI devices.
		For each object represented, its parent is the physical entity it attaches to in the physical world.
	lwn.net /Articles/151074 (491 words)

	Serial Attached SCSI (SAS) Pod for Bus Doctor Analyzer from Finisar
		At the Command level, the Serial Attached SCSI analyzer provides a big-picture view for testers who are troubleshooting system-level or application-level issues.
		The high-level trigger dialogs provide powerful capabilities to trigger on the Serial Attached SCSI Frame types, tasks, SCSI commands, primitives, and out-of-band (OOB) signals from a list without memorizing codes or positions.
		The Serial Attached SCSI Pod turns the Bus Doctor into a full-featured protocol analyzer, with the depth, ease-of-use, protocol decoding and statistics that are needed by software and systems testers.
	www.datatransit.com /products/busdr_pod_sas.html (377 words)

	Fujitsu Demonstrates Serial Attached SCSI and Serial ATA Interoperability at SAS Plugfest : FUJITSU United States
		Fujitsu's 2.5" small form factor serial attached SCSI drives are the next generation of the industry leading MAS series drives in a small form factor enclosure.
		Fujitsu Demonstrates Serial Attached SCSI and Serial ATA Interoperability at SAS Plugfest
		STA was established in 1995 to provide a focal point for members to communicate the benefits of SCSI to the industry.
	www.fujitsu.com /us/news/pr/fcpa_20040720-02.html (1034 words)

	Linux-Kernel Archive: Re: Promise SATA driver GPL'd
		Promise hardware supports native command queueing, a lot like many SCSI adapters.
		ATA tagged command queueing is a bunch of crap.
		For the future, I'm currently whipping the libata internals into shape so that Promise may be supported.
	www.uwsg.indiana.edu /hypermail/linux/kernel/0308.3/0841.html (246 words)

	Windows Vista Product Editions Revealed (Microsoft Milks the market)
		HDD: SATA is definitely the way forward for Vista, due, Microsoft tells us, to Native Command Queueing.
		Microsoft thinks that these features will provide SCSI-level performance.
		NCQ allows for out of order completions - that is, if Vista needs tasks 1,2,3,4 and 5 done, it can do them in the order 2,5,3,4,1 if that's a more efficient route for the hard drive head to take over the disk.
	www.freerepublic.com /focus/f-news/1482831/posts (4134 words)

	AnandTech - SCSI Drive compatiblity...
		You get NCQ (Native Command Queueing) on SCSI drives by default, and a 6ms seek time is not unrealistic.
		SCSI is geared towards high queue depths (i.e.
		I'm not sure about the Raptors, but a similar SCSI drive will still beat a Raptor 95% of the time because of the SCSI interface and the way it works.
	forums.anandtech.com /messageview.cfm?catid=27&threadid=1695476 (3136 words)

	Adaptec: Seagate and Adaptec Team to Deliver Bundled Serial Attached SCSI (SAS) Starter Kit for Achieving Simple SAS Deployments
		SAS was conceived as a best-of-breed storage solution, retaining the time-tested SCSI command set of its parallel predecessor and melding it with the most up-to-date serial technologies available.
		The result is an enterprise-class interface that is simple to integrate and blends four compelling attributes (performance, scalability, compatibility and SCSI integration) to form a cohesive, comprehensive solution.
		"We've worked together to ensure high levels of reliability and compatibility to ensure a smooth and easy transition from legacy SCSI systems to industry-standard SAS solutions."
	www.adaptec.de /worldwide/company/pressrelease.html?sess=no&language=German&pressCat=/Archive&prodkey=10252005&source=home_pr_10252005 (660 words)

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Topic: SCSI command

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