扩容之前有没有check集群有没有什么存在的风险，以及修复风险？
check 过，风险都是已经已知的
Node Check Result Message
---- ----- ------ -------
10.29.0.20 memory Pass memory size is 32768MB
10.29.0.20 limits Fail soft limit of 'stack' for user 'root' is not set or too low
10.29.0.20 limits Fail soft limit of 'nofile' for user 'root' is not set or too low
10.29.0.20 limits Fail hard limit of 'nofile' for user 'root' is not set or too low
10.29.0.20 thp Pass THP is disabled
10.29.0.20 service Fail service irqbalance is not running
10.29.0.20 command Pass numactl: policy: default
10.29.0.20 timezone Pass time zone is the same as the first PD machine: Asia/Shanghai
10.29.0.20 os-version Fail os vendor alinux not supported
10.29.0.20 cpu-cores Pass number of CPU cores / threads: 8
10.29.0.20 cpu-governor Warn Unable to determine current CPU frequency governor policy
10.29.0.20 selinux Pass SELinux is disabled