在部署tidb时，对系统的配置要求比较高，在初始化系统步骤要检查配置，以及压测
tidb、tikv server系统配置检测不通过
修改配置文件/home/tidb/tidb-ansible/roles/check_system_optional/defaults/main.yml
要求比较低的测试环境配置：
# CPU tidb_min_cpu: 2 tikv_min_cpu: 2 pd_min_cpu: 2 monitor_min_cpu: 2 # Mem tidb_min_ram: 160 tikv_min_ram: 160 pd_min_ram: 800 monitor_min_ram: 800 # Disk tidb_min_disk: 500 tikv_min_disk: 500 pd_min_disk: 200 monitor_min_disk: 500
tikv benchmark压测IOPS检测不通过
修改配置/home/tidb/tidb-ansible/roles/machine_benchmark/defaults/mail.yml参考：
fio_deploy_dir: "{
{ tikv_data_dir }}/fio"
# fio randread iops
min_ssd_randread_iops: 40
# fio mixed randread and sequential write
min_ssd_mix_randread_iops: 10
min_ssd_mix_write_iops: 10
# fio mixed randread and sequential write lat
max_ssd_mix_randread_lat: 999999999
max_ssd_mix_write_lat: 999999999
# fio test file size
benchmark_size: 10G