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大容量硬盘可能存在4k分区对齐的问题，对于传统MBR分区，可以使用 fdisk -lu 命令查看
[root@localhost ~]# fdisk -lu /dev/sda
Disk /dev/sda: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 63 102398309 51199123+ fd ext3
/dev/sda2 102398310 106494884 2048287+ fd ext3
/dev/sda3 106494885 2136644999 1015075057+ fd ext3
/dev/sda4 2136645000 3907024064 885189532+ fd ext3
start开始的扇区能不被8整除，就表示没有4k对齐了。
[root@localhost ~]# fdisk -lu /dev/sda
Disk /dev/sda: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 102398309 51199123+ fd ext3
/dev/sda2 102398310 106494884 2048287+ fd ext3
/dev/sda3 106494885 2136644999 1015075057+ fd ext3
/dev/sda4 2136645000 3907024064 885189532+ fd ext3
start开始的扇区能被8整除，就表示4k对齐了。
早期的Linux下分区命令fdisk或者parted 由于版本较低，不支持4k分区对齐，请使用较新的Linux发行版，比如Linpus Lite 2.1等，
都不存在这个问题。
对于GPT分区，可以使用parted /dev/sda unit s print来查看。
[root@localhost ~]# parted /dev/sda unit s print
Model: ATA WDC WD20EARX-00P (scsi)
Disk /dev/sda: 3907029167s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 63s 102398309s 102398247s primary ext3 boot
2 102398310s 106494884s 4096575s primary linux-swap
3 106494885s 2136644999s 2030150115s primary ext3
4 2136645000s 3907024064s 1770379065s primary ext3
start开始的扇区能不被8整除，就表示没有4k对齐了。
[root@localhost ~]# parted /dev/sda unit s print
Model: ATA WDC WD20EARX-00P (scsi)
Disk /dev/sda: 3907029167s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 2048s 102398309s 102398247s primary ext3 boot
2 102398310s 106494884s 4096575s primary linux-swap
3 106494885s 2136644999s 2030150115s primary ext3
4 2136645000s 3907024064s 1770379065s primary ext3
start开始的扇区能被8整除，就表示4k对齐了。
