High disk utilization is due to improper RG configuration
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.