soft / hard Determines the recovery behavior of the NFS client after an NFS request times out. If neither option is speci- fied (or if the hard option is specified), NFS requests are retried indefinitely. If the soft option is speci- fied, then the N…
Linux NFS客户端需要很小心地配置,否则在NFS服务器崩溃时,访问NFS的程序会被挂起,用ps查看,进程状态(STAT)处于D,意为(由于IO阻塞而进入)不可中断睡眠(如果是D+,+号表示程序运行于前台进程组)[1]. 为此,最新的Hadoop HA方案Quorum-Journal的作者在设计文档中对NFS共享存储保存NameNode元数据的作法如下诟病[2]: Custom hardware - the hardware requirements of a NAS device and…