tailieunhanh - UNIX System administration PHẦN 7

mà không có mạng con. Vì vậy, nếu bạn đang cài đặt các máy chủ trên một mạng lớp B với định tuyến mạng con , nhập 179,140. 3. cho dù bạn đang sử dụng subnet định tuyến 4. địa chỉ máy chủ lưu trữ của bạn (254,200 trong example7 - lưu ý rằng nếu bạn đang sử dụng định tuyến mạng con, | UNIX System Administration 2. If you got that list use rpcinfo to check if the mountd server is running. For the above example type etc rpcinfo -u yellow 100005 1 If mountd is running you should get program 100005 version 1 ready and waiting 3. If these two rpcinfo commands fail try this Log into the server. Is it running properly Ensure etc portmap etc mountd and etc nfsd are running. If it s running check the Internet connections. Check the Ethernet connections of server and host. Remember you don t need biod or any NFS server daemons running to be an NFS client. Process blocking in client programs This could be because . the server is down. Restart it. . the nfsd daemon is malfunctioning. Kill it and run nfsd again. . two or more processes are deadlocked. Kill one of them. System hangs part way through boot You probably forgot the background bg option on one of your NFS mounts and the server is down. Slow remote file access If no biod daemons are running on the client start some. Here s how to start four etc biod 4 Check your Ethernet connection. Typing netstat - i will show you if packets are being dropped. Typing netstat -c shows you how much retransmission is occurring retransmission is high bad interface bad connection. If you suspect a bad Ethernet board type netstat -s to see if any UDP packets have been dropped this may occur because of bad checksums in turn causing NFS operations to time out . Many bad transmissions badxid indicates the timeout in the mount operation is too small. Increasing the timeout may not only fix this but improve performance. How a typical network starts Do not attempt to learn about individual daemons from this it is merely a list of things to expect. As we have said see How UNIX starts rc calls rc . local. This runs ifconfig to configure the Ethernet interface. The ln0 device is the first Lance Ethernet interface lo0 is a software loopback device for testing and so forth. The primary network interface should be first. .

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