磁盘性能显示疑问
磁盘分成多个区，为什么iostat显示出来的tps值各分区的总和比磁盘的高？比如：$iostat -d -k 1 10
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
sda 39.29 21.14 1.44441339807 29990031
sda1 0.00 0.00 0.00 1623 523
sda2 1.32 1.43 4.54 29834273 94827104
sda3 6.30 0.85 24.95 17816289520725244
sda5 0.85 0.46 3.40 9543503 70970116
sda6 0.00 0.00 0.00 550 236
sda7 0.00 0.00 0.00 406 0
sda8 0.00 0.00 0.00 406 0
sda9 0.00 0.00 0.00 406 0
sda10 60.68 18.35 71.43383002263 1490928140
sda1~10表示磁盘的分区，sda表示一号磁盘，sda1+sda2+...sda10不是应该=sda吗？是不是我理解概念有问题？sda不是整个磁盘的状态统计？
再比如：
iostat -N
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 1.75 1.98 21.98 591090 6555776
vg_xx-lv_root 2.87 1.95 21.98 581282 6555728
vg_xx-lv_swap 0.00 0.01 0.00 2752 0
iostat -p
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 1.75 1.98 21.98 591090 6555776
sda1 0.00 0.01 0.00 4128 48
sda2 1.75 1.96 21.98 585746 6555728
dm-0 2.87 1.95 21.98 581282 6555728
dm-1 0.00 0.01 0.00 2752 0
根据FDISK显示，其中dm-0,dm-1就是vg_xx-lv_root，vg_xx-lv_swap，他们两个合起来应该是sda2啊，为什么加起来又会比sda2多这么多？
fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000dfedc
Device Boot Start End Blocks IdSystem
/dev/sda1 * 1 64 512000 83Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 3917 30944256 8eLinux LVM
Disk /dev/mapper/vg_xx-lv_root: 28.5 GB, 28462546944 bytes
255 heads, 63 sectors/track, 3460 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/vg_xx-lv_swap: 3221 MB, 3221225472 bytes
255 heads, 63 sectors/track, 391 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
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