Archive: Linux

Using the NMI Watchdog to detect hangs

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NMI watchdog is available for x86 and x86-64 architectures.In order to use the NMI watchdog, kernel must be  support APIC.For  SMP kernel,APIC support has complied in automatically. For Red Hat APIC is always  compiled and  NMI watchdog  is enabled  by  kernel parameter kernel.nmi_watchdog=1.(I/O APIC).Nmi_watchdog=2 parameter (Locall  APIC) uses for  such as create high precision performance profiling. […]

Linux NFS Behind Firewall


Configure  NFS Behind  Firewall NFS service needs  rpcbind,which  dynamically assigns  ports for RPC services. Remote Procedure Call (RPC) is a protocol which one process can used to communicate other server without having to understand  network details. So, running  NFS behind  firwall  is completely related  to RPC services firewall rules.To allow a client to acces  NFS […]