HOHO,我只注實際應用和平時使用的情況總結而已。。。理論歸理論。
在SATA的VPS上生成100m.bin:
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[root@VPS01 tmp]# fdisk -l
Disk /dev/xvda: 52.4 GB, 52428800000 bytes
255 heads, 63 sectors/track, 6374 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/xvda1 * 1 13 104391 83 Linux
/dev/xvda2 14 6374 51094732+ 8e Linux LVM
[root@VPS01 tmp]#
[root@VPS01 tmp]# dd if=/dev/zero of=100M.bin bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.130357 seconds, 804 MB/s
[root@VPS01 tmp]# dd if=/dev/zero of=100M.bin bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.130666 seconds, 802 MB/s
在物理機scsi 73G萬轉硬盤生成100m.bin:
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[root@MyServer1 tmp]# fdisk -l
Disk /dev/sda: 73.5 GB, 73543163904 bytes
255 heads, 63 sectors/track, 8941 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 8941 71714160 8e Linux LVM
[root@MyServer1 tmp]# dd if=/dev/zero of=100M.bin bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.161792 seconds, 648 MB/s
[root@MyServer1 tmp]# dd if=/dev/zero of=100M.bin bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.163828 seconds, 640 MB/s |