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High latency from disk experienced on several volumes

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502
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Category:
ontap-9
Specialty:
perf
Last Updated:

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/rg0:                                                                  
    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   ....     .  
    0a.10.2          100 158.41  121.44   5.35  2337   9.95  35.11   542  27.01   9.93   835   0.00   ....     .   0.00   ....     .  
    0a.12.2          100 153.05  115.90   5.59  2158   9.88  35.00   524  27.27   9.97   803   0.00   ....     .   0.00   ....     .  
    0a.11.3          100 162.10  124.59   5.45  2262  10.05  35.10   528  27.45  10.10   809   0.00   ....     .   0.00   ....     .  
    0a.10.3          100 158.72  121.88   5.39  2298   9.82  34.82   573  27.02  10.05   838   0.00   ....     .   0.00   ....     .  
    1a.12.3          100 157.60  120.63   5.49  2274   9.85  34.90   571  27.11   9.82   875   0.00   ....     .   0.00   ....     .  
    0a.11.4          100 157.67  120.74   5.39  2328   9.96  35.29   568  26.97  10.10   857   0.00   ....     .   0.00   ....     .  
    0a.10.4          100 156.72  119.29   5.64  2180   9.96  34.65   556  27.47   9.79   825   0.00   ....     .   0.00   ....     .
    

     

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