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Azure CVO中的磁盘延迟高、IOPS低

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适用场景

  • ONTAP 9
  • CVO
  • Azure

问题描述

  • 此延迟是通过QoS统计信息中的磁盘延迟来衡量的。
Cluster::> qos statistics volume latency show -vserver vs0 -volume vol0
Workload   ID   Latency   Network   Cluster    Data    Disk     QoS    NVRAM    Cloud
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
vol0    6762  137.73ms   1.91ms   1.00us   22.93ms  112.89ms     0ms     0ms     0ms
vol0    6762  133.29ms   1.82ms     0ms   2.84ms  128.62ms     0ms     0ms     0ms
vol0    6762   78.48ms   1.96ms     0ms   7.69ms   68.83ms     0ms     0ms     0ms
vol0    6762   50.51ms  239.00us     0ms  995.00us   49.28ms     0ms     0ms     0ms
  • statut命令指示在增加磁盘利用率的同时丢弃IOPS。
disk       ut%  xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs
/data_aggr1/plex0/rg0:   
0a.00.18      100 280.18  280.18  64.00  67  0.00  ....   .  0.00  ....   .  0.00  ....   . 0.00  ....   .
0a.00.10      100 280.18  280.18  64.00  64  0.00  ....   .  0.00  ....   .  0.00  ....   . 0.00  ....   .
0a.00.19      100 280.18  280.18  64.00  71  0.00  ....   .  0.00  ....   .  0.00  ....   . 0.00  ....   .
0a.00.12      100 280.18  280.18  64.00  69  0.00  ....   .  0.00  ....   .  0.00  ....   . 0.00  ....   .
0a.00.17      100 280.18  280.18  64.00  75  0.00  ....   .  0.00  ....   .  0.00  ....   . 0.00  ....   .
0a.00.16      100 280.18  280.18  64.00  77  0.00  ....   .  0.00  ....   .  0.00  ....   . 0.00  ....   .
 
  • 磁盘IOPS从>3K减少到~200、磁盘利用率增加到100%、同时具有200_个待定IOPS和排队IOPS。
  • EMS日志显示连接错误、如下所示 
Tue Jul 16 14:47:05 +1000 [azpcvoause101c-01: pha_main000: scsi.cmd.floatTimeout:notice]: "Disk" device "0d.3L0": The page blob I/O operation timeout increased to "20" seconds: HA status "0x4": OSC Error "2": retry count "1": elapsed time "9712" milliseconds: cdb 0x88:00000000000272728820:0009. Disk 0d.3 S/N [sa82p4kn1zbcontainerotqmyqedc7iw] UID [sa82p4kn1zbcontainerotqmyqedc7iw] Target Address

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