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ディスクIO性能(11) - 性能å‘上ã«é‡è¦ãªäº‹
「ディスクI/O性能ã¯ã©ã®ã‚ˆã†ã«ã™ã‚Œã°ã‚ã’られるã®ã‹ã€ã‚’考ãˆã¦ã¿ã‚ˆã†ã€‚ ãã‚“ãªæœ¬é¡Œã‚’考ãˆã‚‹ä¸Šã§ã‚ˆã•ã’ãªè³‡æ–™ã€ŒPerformance Comparison of IDE and SCSI Disks ã€ã‚’見ã¤ã‘ãŸã€‚直接的ã«ã¯ã€IDEã¨SCSIを比較ã—ãŸç‰©ã ãŒã€ãƒ‘フォーマンスを考ãˆã‚‹ä¸Šã§ç€çœ¼ã—ãªãã¦ã¯è¡Œã‹ãªã„点を示ã—ã¦ãれる。 ã¡ã‚‡ãƒ¼é©å½“ã«ã¾ã¨ã‚る㨠ランダムアクセスをå‘上ã™ã‚‹ã«ã¯ã€Tagged Queuing ãŒé‡è¦ã§ã‚る。ディスク内部ã®ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©ãŒå¯„与ã™ã‚‹éƒ¨åˆ†ã§ã‚ã‚‹(ã¤ã¾ã‚Šã¯ãƒ‡ã‚£ã‚¹ã‚¯ã®ãƒ•ã‚¡ãƒ¼ãƒ ã®æ”¯é…é ˜åŸŸ)。SCSIã¨IDEã¨ã‚‚ã« TCQ/NCQ ã¨ã—ã¦çŸ¥ã‚‰ã‚Œã¦ãŠã‚Šã€ã‚·ãƒ¼ã‚¯æ€§èƒ½ã«å¿œã˜ã¦ã“れを深ãã™ã‚‹ã¨è‰¯ã„。但ã—ã€IDEã®ã‚·ãƒ¼ã‚¯æ€§èƒ½ãŒè‹¥å¹²åŠ£ã‚‹ã®ã§TCQ/NCQã®æœ€å¤§ã®æ·±ã•32ã§ã¯è¶³ã‚Šãªãã†ã€‚ kernelå´ã®ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©ã¯é‡è¦ã€‚例ã§ã¯FreeBSDãªã®ã§ãƒ‘ットã—ãªã„(デãƒãƒ‰ãƒ©å†…ã«ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©
伊勢雅英ã®IT見èžéŒ² SCSIユーザも注目!? 㮠シリアルATA Native Command Queuing
シリアルATAã®åˆ©ç”¨ç¯„囲拡大を目指ã—ã¦ç–定ä¸ã®æ¬¡ä¸–代仕様「シリアルATA IIã€ãŒç™ºè¡¨ã•ã‚Œã¦1年を経éŽã—ãŸãŒã€ä»Šå¹´9月ã«ã¯ã‚·ãƒªã‚¢ãƒ«ATA IIã®æ©Ÿèƒ½ã‚’強化ã™ã‚‹æ‹¡å¼µä»•æ§˜ãŒã„ãã¤ã‹è¿½åŠ ã•ã‚Œã‚‹ãªã©ã€ã‹ãªã‚Šç©æ¥µçš„ãªæ§˜åãŒã†ã‹ãŒãˆã‚‹ã€‚今回ã¯ã€ã‚·ãƒªã‚¢ãƒ«ATA製å“ã®é–‹ç™ºã«æºã‚るベンダã‹ã‚‰ã®ã‚³ãƒ¡ãƒ³ãƒˆã‚’交ãˆãªãŒã‚‰ã€ã‚·ãƒªã‚¢ãƒ«ATA IIã§æœ€ã‚‚注目ã—ãŸã„新機能「Native Command Queuingã€ã®ä»•çµ„ã¿ã‚’解説ã—ã¦ã„ã。 â—多ãã®PCã§ãƒ‘フォーマンスå‘上を期待ã§ãã‚‹Native Command Queuing シリアルATA IIã¯ã€ã‚µãƒ¼ãƒã‚„ワークステーションã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸å‘ã‘ã®æ‹¡å¼µæ©Ÿèƒ½ã‚’æä¾›ã™ã‚‹ã‚·ãƒªã‚¢ãƒ«ATA 1.0ã®è£œåŠ©ä»•æ§˜ã§ã‚る。シリアルATA IIã«è¿½åŠ ã•ã‚ŒãŸæ©Ÿèƒ½ã«ã¯ã€ãƒ‡ãƒ¼ã‚¿ã‚¢ã‚¯ã‚»ã‚¹ã®åŠ¹çŽ‡ã‚’高ã‚ã‚‹Native Command Queuingã€ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã®ç体内部(温度ã€å†·å´ãƒ•ã‚¡ãƒ³ã®å›ž
Native Command Queuing - Wikipedia
NCQ allows the drive itself to determine the optimal order in which to retrieve outstanding requests. This may, as here, allow the drive to fulfill all requests in fewer rotations and thus less time. In computing, Native Command Queuing (NCQ) is an extension of the Serial ATA protocol allowing hard disk drives to internally optimize the order in which received read and write commands are executed.
Tagged Command Queuing - Wikipedia
Tagged Command Queuing (TCQ) is a technology built into certain ATA and SCSI[1] hard drives. It allows the operating system to send multiple read and write requests to a hard drive. ATA TCQ is not identical in function to the more efficient Native Command Queuing (NCQ) used by SATA drives.[2] SCSI TCQ does not suffer from the same limitations as ATA TCQ. Without TCQ, an operating system was limite
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