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由于聚合可用空间较低而导致的性能影响

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适用于

ONTAP 9

问题

  • 用户或应用程序遇到性能问题,ONTAP 显示的延迟高于正常
  • 要检查聚合中的可用空间量,请运行 aggr show-space cluster shell 命令。聚合可用空间低,已用空间超过 90%

示例

cluster::> aggr show-space -aggregate <aggr_name> 
...
         Physical Used Percentage: 91%  

 

  • 从 CDOT 控制器或具有更高 cp 读数的 7-mode 控制器的节点 shell 上的 statit 可以看到详细说明 cp-read 和 write 操作的聚合磁盘统计信息

示例

::> set advanced
::*> node run -node node_1 statit -b
/* wait 60s */
::*> node run -node node_1 statit -e
...
disk        ut%  xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs
/aggr1/plex0/rg0:
9d.01.0       36  99.01   0.00   ....    .  47.50  62.96   179  51.51  57.25   81 
9d.02.0       34 100.39   0.00   ....    .  48.92  61.20   162  51.48  57.25   68 
1c.03.0       56 206.74   99.04   3.22  2035  40.75  40.53   315  66.95  14.92   338 
9d.00.0       73 206.66  100.15   3.22  2993  40.26  40.76  1004  66.25  14.80   640 
9d.01.1       73 208.33  101.16   3.31  2918  40.38  40.48  1021  66.79  14.91   643 

  • 可能存在 EMS 日志条目: 
    [wafl.vol.full:notice]: Insufficient space on volume Cluster1_vol@vserver:0cc56ede-1c58-11e6-XXXX-00a09893e1f7 to perform operation. 8.00KB was requested but only 1.00KB was available.
  • 长一致性点(CP):由于完整的聚合,系统报告了多个长 CP,表明它正在努力将数据写入磁盘
   [CLUSTER1-01: wafl_exempt05: wafl.cp.toolong:error]: Aggregate local_tier_2 experienced a long CP.

 

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