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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. | | | Since then, SCSI has developed as an industry-wide standard, capable of being applied to virtually any computer system (there were even SCSI implementations for the venerable Commodore 64 and Apple II home computers). |
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http://en.wikipedia.org/wiki/SCSI
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| | 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. | | | SCSI on FC-AL will be expensive and will require some changes to software as well as hardware. |
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http://www.paralan.com/glos.html
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| | comp.periphs.scsi FAQ part 1 of 2 |
| | SCSI was broken up from a single document into different layers and command sets. | | | These SCSI capabilities are very valuable in a true multi-tasking environment, especialy important in a busy file server, and useless under DOS, which cannot take advantage of them. | | | The stated goal of compatibility between manufacturers had not been achieved in SCSI in 1986 due to a proliferation of undocumented "features." Each implementation was different enough that new software drivers had to be written for each device. |
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http://www.faqs.org/faqs/scsi-faq/part1
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| | 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. | | | Also it was now possible to have more than one host adapter on a SCSI bus. |
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http://www.scsilibrary.com
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| | Encyclopedia4U - SCSI - Encyclopedia Article |
| | The original SCSI standards specified the physical characteritics of the bus(es) and the electrical signalling sequences required to achieve a given action, as well as the command set that defines the different things SCSI devices can do. | | | SCSI (pronouned "scuzzy", sometimes like "sexy"), stands for " Small Computer System Interface ", and provides a standard means for transferring data between devices on a computer bus. | | | Since then, SCSI has developed as an industry-wide standard, capable of being applied to virtually any computer system (there were even SCSI implementations for the venerable Commodore 64 home computer). |
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http://www.encyclopedia4u.com/s/scsi.html
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| | Encyclopedia4U - SCSI - Encyclopedia Article |
| | The original SCSI standards specified the physical characteritics of the bus(es) and the electrical signalling sequences required to achieve a given action, as well as the command set that defines the different things SCSI devices can do. | | | SCSI (pronouned "scuzzy", sometimes like "sexy"), stands for " Small Computer System Interface ", and provides a standard means for transferring data between devices on a computer bus. | | | Since then, SCSI has developed as an industry-wide standard, capable of being applied to virtually any computer system (there were even SCSI implementations for the venerable Commodore 64 home computer). |
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http://www.encyclopedia4u.com/s/scsi.html
(311 words)
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| | 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. | | | The SCSI card or circuitry in a host computer that allows the host to communicate with the SCSI devices is called a host adapter. |
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http://www.paralan.com/glos.html
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| | AnandTech - SCSI Drive compatiblity... |
| | You get NCQ (Native Command Queueing) on SCSI drives by default, and a 6ms seek time is not unrealistic. | | | 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. | | | SCSI's a great idea and performs exceptionally under high loads; for instance, copying files while doing something else (like a defrag), where a SATA/IDE drive will really slow down. |
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http://forums.anandtech.com/messageview.cfm?catid=27&threadid=1695476
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| | hard drive - encyclopedia article about hard drive. |
| | and SCSI SCSI stands for "Small Computer System Interface", and is a standard interface and command set for transferring data between devices on a computer bus. | | | A hard disk is generally accessed over one of a number of bus types, including ATA (IDE, EIDE), SCSI 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 (originally named SASI for Shugart (sic) Associates) or Small Computer System Interface was an early competitor with ESDI. |
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http://encyclopedia.thefreedictionary.com/hard%20drive
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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 a computer bus. | | | Since then, SCSI has developed as an industry-wide standard, capable of being applied to virtually any computer system (there were even SCSI implementations for the venerable Commodore 64 home computer). | | | Each SCSI device (including the computer's host adapter) must be configured to have a unique SCSI ID on the bus. |
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http://en.wikipedia.org/wiki/SCSI
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| | 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. | | | SCSI on FC-AL will be expensive and will require some changes to software as well as hardware. |
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http://www.paralan.com/glos.html
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| | 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. | | | Abstract The Small Computer Systems Interface (SCSI) is a popular family of protocols that enable systems to communicate with I/O devices, especially storage devices. |
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http://www.mit.edu/afs/athena.mit.edu/reference/rfc/authors/rfc3720-diffb.html
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| | 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 - Small Computer System Interface:- is a high performance parallel interface for connected mass storage devices such as disk drives to a computer. | | | In fact the legacy software established with the SCSI protocol has led to 2 other variants developing in recent years. |
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http://www.storagesearch.com/scsi.html
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| | 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 ports continue to be built into many personal computers today and are supported by all major operating systems. | | | Developed at Apple Computer and still used in the Macintosh, the present set of SCSIs are parallel interfaces. |
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http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci212949,00.html
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| | 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. | | | SCSI-2 was an upgrade from the original SCSI interface. | | | This term refers to the 1 byte wide data bus on a 50-pin parallel interface that is defined in the ANSI standard SCSI-1 (X3.131-1986). |
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http://www.seagate.com/support/kb/disc/scsirev.html
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| | hard drive - encyclopedia article about hard drive. |
| | and SCSI 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 (originally named SASI for Shugart (sic) Associates) or Small Computer System Interface was an early competitor with ESDI. | | | External SCSI drives were also popular with older microcomputers such as the Apple II series and the Commodore 64, and were also used extensively in servers, a usage which is still popular today. |
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http://encyclopedia.thefreedictionary.com/hard%20drive
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| | 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. | | | Most consumer-grade routers allow for a user-specified MAC address to be given. | | | The distinction between EUI-48 and MAC-48 identifiers is purely semantic: MAC-48 is used for network hardware; EUI-48 is used to identify other sorts of devices and software. |
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http://en.wikipedia.org/wiki/MAC_address
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| | Is native SATA same as ncq SATA : LinuxQuestions.org time based Linux archive |
| | 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. | | | 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. |
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http://www.linuxquestions.org/questions/archive/18/2004/10/1/236501
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| | 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. |
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http://www.datatransit.com/products/busdr_pod_sas.html
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| | Fujitsu Demonstrates Serial Attached SCSI and Serial ATA Interoperability at SAS Plugfest : FUJITSU United States |
| | Additionally, the hard disk drive features Native Command Queuing (NCQ), an important feature that intelligently and simultaneously coordinates up to 32 instructions to be queued and reordered by the hard disk controller, contributing to a significant improvement in overall hard disk drive performance. | | | 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 |
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http://www.fujitsu.com/us/news/pr/fcpa_20040720-02.html
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| | 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. |
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http://www.systemcooling.com/maxtor_300gb-03.html
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| | 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... | | | Hopefully we soon see mainboards with either this controller integrated, or others which support this feature... |
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http://northernsounds.com/forum/archive/index.php/t-19789.html
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| | BERG SOFTWARE DESIGN: Storage Cornucopia |
| | SCSI Enclosure Services (SES) Final Draft: SCSI-3 command set for device enclosures | | | Adtron: legacy SCSI HDD emulations using IDE HDD+adapter | | | SPI-2 Final Draft: SCSI Parallel Interface-2 (Physical Layer; includes Fast-40/Ultra2 and LVD) |
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http://www.bswd.com/cornucop.htm
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| | 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. | | | "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." | | | 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. |
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http://www.adaptec.de/worldwide/company/pressrelease.html?sess=no&language=German&pressCat=/Archive&prodkey=10252005&source=home_pr_10252005
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| | 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 the main reason why there is the limitation of two drives on an ATA channel. | | | 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. |
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http://www.neoseeker.com/Hardware/faqs/kb/15,71.html
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| | 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. | | | The third email in this series shows an example of using the "expander_conf.c" program to query all expanders in the domain, showing their attributes, their phys, and their routing tables. |
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http://lwn.net/Articles/151074
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| | Windows Vista Product Editions Revealed (Microsoft Milks the market) |
| | Microsoft thinks that these features will provide SCSI-level performance. | | | HDD: SATA is definitely the way forward for Vista, due, Microsoft tells us, to Native Command Queueing. | | | 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. |
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http://www.freerepublic.com/focus/f-news/1482831/posts
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| | i9.net Tech News: Hard Drives Made for RAID Use |
| | In works better in RAID than other drives because of features like its time-limited error recovery and 32-bit CRC error checking, so it is an option when previously only SCSI drives would be considered." | | | The Caviar RE SATA 320 GB is an enterprise level drive without native command queueing and uses an SATA interface. | | | An anonymous reader writes "Hard drive giant Western Digital recently released a very interesting product, hard drives designed to work in a RAID. |
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http://www.i9.net/2005/09/hard_drives_made_for_raid_use.html
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| | 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. | | | SAS disks however may not be plugged into a SATA controller. |
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http://en.wikipedia.org/wiki/SATA
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