07-416r1 T10 USB Queuing Transport (UQT) study group introduction. by Rob Elliott, HP 25 September 2007
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1 07-416r1 T10 USB Queuing Transport (UQT) study group introduction by Rob Elliott, HP 25 September 2007
2 USB and other external desktop interfaces USB dominates the market billion USB ports shipped as of 2007 (2.1 in 2006) Pat Gelsinger, Intel, at Intel Developer forum 19 Sep 2007 External interface Line rate Throughput USB Low Speed 1.5 MBit/sec 192 KB/sec USB Full Speed 12 MBit/sec 1.5 MB/sec USB 2.0 Hi-Speed 480 MBit/sec 60 MB/sec MBit/sec 200 MBit/sec 400 MBit/sec 12.5 MB/sec 25 MB/sec 50 MB/sec 1394b 800 MBit/sec 80 MB/sec esata 1.5 Gbit/sec 3 Gbit/sec 150 MB/sec 300 MB/sec 2 25 September r1 T10 USB Queuing Transport project proposal
3 USB storage performance USB Mass Storage Class Bulk-Only Transport is a SCSI transport protocol (not ATA) USB 2.0 mass storage performance is becoming an issue Theoretical limit around 48 MBps (bus is half duplex and host-polled) Disk drives max out around MBps with standard Microsoft Windows drivers Protocol may not scale well to USB September r1 T10 USB Queuing Transport project proposal
4 Disk and flash drive bandwidth demands Desktop-class disk drive bandwidth faster than USB WD Caviar: 54.4 to 97 MBps WD Raptor: 55.4 to 88.3 MBps Hitachi Deskstar: 46.4 to 86.9 MBps Samsung SpinPoint: 41.5 to 83 MBps Seagate Barracuda: 44.3 to 78.5 MBps (Miminum to maximum read bandwidth per benchmarks on Flash (solid state) drives still have headroom Up to 10 MBps reads, 3 MBps writes in 2004 ( Up to 29.4 MBps reads, MBps writes in 2006 ( ) 4 25 September r1 T10 USB Queuing Transport project proposal
5 USB performance vs. other interfaces June 2007 comparison on September r1 T10 USB Queuing Transport project proposal
6 Performance limitations of USB MSC Bulk-Only Some protocol limitations impair performance Polled interface No XFER_RDY like notification that drive is ready for write data Possibility: advise host how long to wait before polling cache lookup -> short wait cache miss, seeking -> long wait No queuing esata now supports NCQ (native command queuing) Data transferred in-order When adding queuing, need to let commands finish out of order Out-of-order data within a command not as important 6 25 September r1 T10 USB Queuing Transport project proposal
7 Other limitations of USB MSC Bulk-Only Only 16 LUNs SCSI architecture requires 16,384 LUNs (2-byte LUN field) No bidirectional commands 16 byte maximum CDB size Object Storage Device (OSD) command set requires bidirectional long CDBs No SCSI status values just Passed, Failed, and Phase Error no BUSY, TASK SET FULL, etc. and no Retry Delay field No SCSI autosense data REQUEST SENSE command required CA concept obsolete after SAM-2 No task attributes (SIMPLE, ORDERED, HEAD OF QUEUE) No task priority field Serial ATA 2.6 includes a Priority feature No task management functions (ABORT TASK, LOGICAL UNIT RESET, etc.) Redundant transfer length field in command block wrapper both good and bad 7 25 September r1 T10 USB Queuing Transport project proposal
8 Proposal Start a new T10 project for a new USB Queued SCSI transport protocol Support queuing and be SAM-4 compliant Compatible with USB 2.0 and forward-looking Devices and hosts must be able to implement both the current MSC and the new protocol for software compatibility Define the protocol in INCITS T10 T10 WGs open to all; T10 plenary votes for T10 members only INCITS/ANSI patent policy only requires RAND (not RAND-Z) USB Device WG members can participate Avoid reusing existing USB MSC material to avoid need for a copyright release T10 can reference USB specifications, just not quote extensively from them 8 25 September r1 T10 USB Queuing Transport project proposal
9 References USB Mass Storage Class Specification Overview, Revision 1.2, 23 June 2003 USB Mass Storage Class Control/Bulk/Interrupt Transport, Revision 1.1, 23 June 2003 (used by floppy drives only) USB Mass Storage Class Bulk-Only Transport, Revision 1.0, 31 September 1999 USB mass storage specifications are available at the USB Implementers Forum at SCSI Architecture Model 4 (SAM-4), latest working draft on T10/ proposes a SAM annex listing the choices about optional features that each SCSI transport protocol has made (see highlights some of the areas that this protocol will have to cover USB 3.0 announced at Intel Developer Forum 18 September September r1 T10 USB Queuing Transport project proposal
10 10 25 September r1 T10 USB Queuing Transport project proposal
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To: T10 Technical Committee From: Rob Elliott, HP (elliott@hp.com) and Jeff Wolford, HP (jeff.wolford@hp.com) Date: 10 Dec 2007 Subject: 07-200r3 SAT-2 WRITE LONG to WRITE UNCORRECTABLE EXT Revision history
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