外付けHDD(GW3.5MX2-SUE/CB)を追加するにあたり、PC本体がUSB1.1のみで転送速度が遅いため、USB2.0カードを購入。
結果として約14倍転送速度が上がった。選択肢として、Cardbus<->SATAもあるが、高い。USB2.0カードならば2千円だ。
USB1.1(MB/sec) | USB2.0(MB/sec) | |
2.5inch 20GB | 0.91 | 13.18 |
3.5inch 500GB | 0.98 | 13.84 |
[root@ ~]# fdisk -l Disk /dev/sda: 500.1 GB, 500107862528 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = シリンダ数 of 16065 * 512 = 8225280 bytes デバイス Boot Start End Blocks Id System /dev/sda1 1 60801 488384001 83 Linux Disk /dev/sdb: 20.0 GB, 20003880960 bytes 64 heads, 32 sectors/track, 19077 cylinders Units = シリンダ数 of 2048 * 512 = 1048576 bytes デバイス Boot Start End Blocks Id System /dev/sdb1 1 19077 19534832 83 Linux Disk /dev/sdc: 500.1 GB, 500107862528 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = シリンダ数 of 16065 * 512 = 8225280 bytes デバイス Boot Start End Blocks Id System /dev/sdc1 1 60801 488384001 83 Linux
[root@ ~]# hdparm -ft /dev/sda1 /dev/sda1: Timing buffered disk reads: 4 MB in 4.08 seconds = 1004.81 kB/sec
[root@ ~]# hdparm -ft /dev/sdb1 /dev/sdb1: Timing buffered disk reads: 4 MB in 4.37 seconds = 937.66 kB/sec
Jan 3 21:44:51 kernel: PCI: Enabling device 0000:02:00.0 (0000 -> 0002) Jan 3 21:44:51 kernel: ACPI: PCI Interrupt 0000:02:00.0[A] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11 Jan 3 21:44:51 kernel: ohci_hcd 0000:02:00.0: OHCI Host Controller Jan 3 21:44:51 kernel: ohci_hcd 0000:02:00.0: new USB bus registered, assigned bus number 3 Jan 3 21:44:51 kernel: ohci_hcd 0000:02:00.0: irq 11, io mem 0x1e800000 Jan 3 21:44:51 kernel: hub 3-0:1.0: USB hub found Jan 3 21:44:51 kernel: hub 3-0:1.0: 3 ports detected Jan 3 21:44:51 kernel: PCI: Enabling device 0000:02:00.1 (0000 -> 0002) Jan 3 21:44:51 kernel: ACPI: PCI Interrupt 0000:02:00.1[B] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11 Jan 3 21:44:51 kernel: ohci_hcd 0000:02:00.1: OHCI Host Controller Jan 3 21:44:51 kernel: ohci_hcd 0000:02:00.1: new USB bus registered, assigned bus number 4 Jan 3 21:44:51 kernel: ohci_hcd 0000:02:00.1: irq 11, io mem 0x1e801000 Jan 3 21:44:51 kernel: hub 4-0:1.0: USB hub found Jan 3 21:44:51 kernel: hub 4-0:1.0: 2 ports detected Jan 3 21:44:54 kernel: PCI: Enabling device 0000:02:00.2 (0000 -> 0002) Jan 3 21:44:54 kernel: ACPI: PCI Interrupt 0000:02:00.2[C] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11 Jan 3 21:44:54 kernel: ehci_hcd 0000:02:00.2: EHCI Host Controller Jan 3 21:44:54 kernel: ehci_hcd 0000:02:00.2: new USB bus registered, assigned bus number 5 Jan 3 21:44:54 kernel: ehci_hcd 0000:02:00.2: irq 11, io mem 0x1e802000 Jan 3 21:44:54 kernel: ehci_hcd 0000:02:00.2: park 0 Jan 3 21:44:54 kernel: ehci_hcd 0000:02:00.2: USB 2.0 initialized, EHCI 1.00, driver 10 Dec 2004 Jan 3 21:44:54 kernel: hub 5-0:1.0: USB hub found Jan 3 21:44:54 kernel: hub 5-0:1.0: 5 ports detected
Disk /dev/sda: 20.0 GB, 20003880960 bytes 64 heads, 32 sectors/track, 19077 cylinders Units = シリンダ数 of 2048 * 512 = 1048576 bytes デバイス Boot Start End Blocks Id System /dev/sda1 1 19077 19534832 83 Linux Disk /dev/sdb: 500.1 GB, 500107862528 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = シリンダ数 of 16065 * 512 = 8225280 bytes デバイス Boot Start End Blocks Id System /dev/sdb1 1 60801 488384001 83 Linux Disk /dev/sdc: 500.1 GB, 500107862528 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = シリンダ数 of 16065 * 512 = 8225280 bytes デバイス Boot Start End Blocks Id System /dev/sdc1 1 60801 488384001 83 Linux
[root@ ~]# hdparm -ft /dev/sda1 /dev/sda1: Timing buffered disk reads: 40 MB in 3.04 seconds = 13.18 MB/sec
[root@ ~]# hdparm -ft /dev/sdb1 /dev/sdb1: Timing buffered disk reads: 42 MB in 3.03 seconds = 13.84 MB/sec
コメントはありません。 Comments/雑記/2008-01-03