Package: nfs-common Version: 1:1.1.2-6lenny2 After 5 minutes of inactivity of an nfs share, the status of the TCP connection between the client port (779 in the transcript below) and the NFS server port (2049) switches from "ESTABLISHED" to "TIME_WAIT" which is totally normal. Then, according to the default timeout value for the TIME_WAIT state, the connection remains in this state for one minute (60 seconds, which is twice the value of the MSL). If during this minute, another attempt to access the same NFS share is performed, an Input/output error is generated. After a minute the connection occurs normally with the same client port number (779 in the transcript below). Below is a transcript:
########BEGINNING OF TRANSCRIPT ############### # netstat -na | grep 10.0.0.1 ; date Fri Jul 30 10:22:18 CEST 2010 # mount -t nfs 10.0.0.1:/export/test on /share/test type nfs (rw,intr,rsize=8192,wsize=8192,addr=10.0.0.1) # netstat -na | grep 10.0.0.1 # date; time ls /share/test/ ; date Fri Jul 30 10:22:55 CEST 2010 testfile real 0m0.003s user 0m0.000s sys 0m0.000s Fri Jul 30 10:22:55 CEST 2010 # netstat -na | grep 10.0.0.1 ; date tcp 0 0 10.0.0.2:779 10.0.0.1:2049 ESTABLISHED Fri Jul 30 10:23:58 CEST 2010 # netstat -na | grep 10.0.0.1 ; date tcp 0 0 10.0.0.2:779 10.0.0.1:2049 TIME_WAIT Fri Jul 30 10:28:08 CEST 2010 # date; time ls /share/test/ ; date Fri Jul 30 10:28:16 CEST 2010 ls: cannot access /share/test/: Input/output error real 0m0.186s user 0m0.000s sys 0m0.056s Fri Jul 30 10:28:16 CEST 2010 # netstat -na | grep 10.0.0.1 ; date tcp 0 0 10.0.0.2:779 10.0.0.1:2049 TIME_WAIT Fri Jul 30 10:28:23 CEST 2010 # netstat -na | grep 10.0.0.1 ; date Fri Jul 30 10:29:15 CEST 2010 # date; time ls /share/test/ ; date Fri Jul 30 10:29:19 CEST 2010 testfile real 0m0.003s user 0m0.000s sys 0m0.000s Fri Jul 30 10:29:19 CEST 2010 # netstat -na | grep 10.0.0.1 ; date tcp 0 0 10.0.0.2:779 10.0.0.1:2049 ESTABLISHED Fri Jul 30 10:29:22 CEST 2010 # ############END OF TRANSCRIPT ############### I am using Debian Lenny 2.6.26-2-amd64 #1 SMP Sun Jun 20 20:16:30 UTC 2010 x86_64 GNU/Linux. It should be noted that on other system/version (Last updates of Redhat 5.5, Ubuntu 10.04, Debian Squeeze/Sid), the behavior is slightly different: When the connection is reinstated during the "TIME_WAIT minute", another port number (the client port number minus one) is used and the NFS share can be accessed without error. Sincerely, Jean-Francois C. Weber Linux System Engineer Phone: +33 1 70 44 04 17 jeanfrancois.we...@sfr.com 6 rue Nieuport 78140 Velizy-Villacoublay, France www.sfrbusinessteam.fr -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/768d454025d7514c865396a778cde4b4aa294bc...@excv004.encara.local.ads
