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我一直在 iSCSI 启动器(centos)和 iSCSI 目标(netbsd)之间进行磁盘 i/o 性能测试。在场景中,我希望禁用所有缓冲区和缓存(如网络缓冲区、硬件缓存)。是否有任何工具或命令可以在禁用所有缓冲区和缓存的情况下检查磁盘 i/o 性能,以及如何禁用这些缓冲区和缓存?