试了下ssd的速度  感觉还是不太理想  求高手指点？

刚好手上有个linode 主机做了下对比：

1ssd 的读写

Disk /dev/xvda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x00078f9c

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1        2611    20970496   83  Linux
# hdparm -t /dev/xvda

/dev/xvda:
Timing buffered disk reads: 322 MB in  3.00 seconds = 107.23 MB/sec

2.阿里云普通主机：
# hdparm -t /dev/xvda1                                    
/dev/xvda1:
Timing buffered disk reads: 220 MB in  3.07 seconds =  71.64 MB/sec

3. linode
# hdparm -t /dev/xvda
/dev/xvda:
Timing buffered disk reads: 1252 MB in  3.00 seconds = 417.18 MB/sec