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Azure 磁盘性能

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Azure 磁盘性能

我正在 Azure 中南美国区域运行按需研究D14实例，使用 4 磁盘 RAID0。最近磁盘性能变得慢得无法使用，尤其是 RAID 性能，几乎比组成它的驱动器还要差。
这种行为是最近几天才出现的——以前速度超过 150MB/s。机器上没有新的负载。

我怎样才能提高绩效？

高清性能hdparm -t：

$ sudo hdparm -t /dev/sda /dev/sdb /dev/md127 /dev/sdc /dev/sdd /dev/sde /dev/sdf

/dev/sda:
 Timing buffered disk reads: 110 MB in  3.05 seconds =  36.12 MB/sec

/dev/sdb:
 Timing buffered disk reads: 1286 MB in  3.00 seconds = 428.44 MB/sec

/dev/md127:
 Timing buffered disk reads:  52 MB in  3.77 seconds =  13.80 MB/sec

/dev/sdc:
 Timing buffered disk reads:  46 MB in  3.42 seconds =  13.45 MB/sec

/dev/sdd:
 Timing buffered disk reads:  54 MB in  3.15 seconds =  17.14 MB/sec

/dev/sde:
 Timing buffered disk reads:  40 MB in  3.14 seconds =  12.75 MB/sec

/dev/sdf:
 Timing buffered disk reads:  62 MB in  3.05 seconds =  20.35 MB/sec

RAID0：

$ sudo mdadm --detail /dev/md127

/dev/md127:
        Version : 1.2
  Creation Time : Sat Oct  4 14:00:57 2014
     Raid Level : raid0
     Array Size : 1048573952 (1000.00 GiB 1073.74 GB)
   Raid Devices : 4
  Total Devices : 4
    Persistence : Superblock is persistent

    Update Time : Sat Oct  4 14:00:57 2014
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 512K

           Name : datacrunch:127  (local to host datacrunch)
           UUID : 2450cdf6:27e90d49:467e1esd:4c96b8f7
         Events : 0

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       81        1      active sync   /dev/sdf1
       2       8       49        2      active sync   /dev/sdd1
       3       8       65        3      active sync   /dev/sde1

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