红帽全球峰会4.2. 调整内核
生产集群可从调优操作系统（特别是限值和内存分配）中受益。确保为集群中的所有节点设置了调整。请联系红帽支持以获取其他指导。
4.2.1. 为 OSD 保留可用内存
复制链接链接已复制到粘贴板!
要帮助防止 OSD 内存分配请求期间内存相关错误不足，请在 ceph-ansible 节点上的 group 选项。这个选项指定要保留的物理内存量。推荐的设置基于系统 RAM 量。例如：
_vars/all.yml 设置 theos_ tuning_params
对于 64GB RAM，请保留 1GB。
vm.min_free_kbytes = 1048576对于 128GB RAM，请保留 2GB。
vm.min_free_kbytes = 2097152对于 256GB RAM，请保留 3GB。
vm.min_free_kbytes = 3145728
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