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High disk utilization is due to improper RG configuration

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • Performance

Issue

  • High latency is seen in volumes located on SATA or SAS disk aggregate which are highly utilized (100%)
  • Use statit to identify if high disk utilization or latency in the aggregate containing the volume
disk             ut%  xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs
/data_aggr1/plex0/rg1:                                                                  
0a.11.1           10  23.42    0.00   ....     .  11.21  61.56   133  12.21  57.15    50   0.00   ....     .   0.00   ....     .  
0a.10.1           11  23.80    0.00   ....     .  11.66  59.25   147  12.14  57.37    55   0.00   ....     .   0.00   ....     .  
1a.12.1          100 158.69  120.29   5.43  2299  10.26  34.39   553  28.15   9.93   839   0.00   ....     .   0.00   ....     .  
0a.11.2          100 156.09  118.85   5.39  2253   9.96  34.97   553  27.28  10.05   794   0.00   ....     .   0.00   ....     .

Note: rg1 only consists of two data disks so that these two disks would be become hot disks and bottleneck.

 

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