TCP IP Illustrated

Nfs sun7b23 reply ok 1124 sun7b25 svr4nfs 116 read

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Unformatted text preview: 594) 167 311.149476 0.0658) 311.150004 170 0.0005) 311.154852 171 0.0048) 311.156671 172 0.0018) 169 ( ( ( ( sun.7b24 > svr4.nfs: bytes @ 73728 sun.7b23 > svr4.nfs: bytes @ 65536 sun.7b24 > svr4.nfs: bytes @ 73728 sun.7b23 > svr4.nfs: bytes @ 65536 sun.7b24 > svr4.nfs: bytes @ 73728 sun.7b23 > svr4.nfs: bytes @ 65536 sun.7b24 > svr4.nfs: bytes @ 73728 sun.7b23 > svr4.nfs: bytes @ 65536 sun.7b24 > svr4.nfs: bytes @ 73728 sun.7b23 > svr4.nfs: bytes @ 65536 sun.7b24 > svr4.nfs: bytes @ 73728 sun.7b23 > svr4.nfs: bytes @ 65536 sun.7b24 > svr4.nfs: bytes @ 73728 retransmissions continue sun.7b24 > svr4.nfs: bytes @ 73728 sun.7b23 > svr4.nfs: bytes @ 65536 server reboots 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 116 read 1024 arp who-has sun tell svr4 arp reply sun is-at 8:0:20:3:f6:42 svr4.nfs > sun.7b23: reply ok 1124 sun.7b25 > svr4.nfs: 116 read 1024 bytes @ 66560 file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/nfs_netw.htm (19 of 23) [12/09/2001 14.47.56] Chapter 29. NFS: Network File System 173 311.168926 ( 0.0123) svr4.nfs > sun.7b25: reply ok 1124 reading continues Figure 29.9 Client reading a file when an NFS server crashes and reboots. Lines 1-10 correspond to the client opening the file. The operations are similar to those shown in Figure 29.7. In line II we see the first READ of the file, with 1024 bytes of data returned in line 12. This continues (a READ of 1024 followed by a reply of OK) through line 129. In lines 130 and 131 we see two requests that time out and are retransmitted in lines 132 and 133. The first question is why are there two read requests, one starting at offset 65536 and the other starting at 73728? The client kernel has detected that the client application is performing sequential reads, and is trying to prefetch data blocks. (Most Unix kern...
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This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.

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