[Networker] all sessions slow at some time during backup
2012-11-25 19:23:25
Ok, the transfer that is stalling is caused by the process using port 8094
5.502271 130.1.1.118 -> 130.1.1.45 TCP [TCP ZeroWindow] 8094 > 59561 [ACK]
Seq=1 Ack=56809 Win=0 Len=0 TSV=163928420 TSER=311968938
Which would be (accroding to lsof | grep TCP | grep 8094) PID 11561
# ps -ef | grep 11561
root 11561 10625 6 Nov18 ? 11:21:26 /opt/nsr/nsrmmd -n 2
strace reveals FD 7
01:11:02.593016 write(7, "\0\0\0\0XL0305 NETWORKER
3\0\0\0\0\0\0\0\0\0\0\0\
which finally boils down to the tape drive
# lsof -p 11561 | grep 7u
nsrmmd 11561 root 7u CHR 9,128 0t0 6489 /dev/nst0
I also found this.
http://www.mibus.org/2012/11/11/networker-random-stalling/
Not sure though if just killing nsrmmd is a solution..
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