[mythtv-users] help! mythbackend going off line without warning

[Mark Knecht]

Hi there,
   I've run mythbackend very happily for quite awhile now and been
pretty happy, but we haven't had much storage, only about 17 hours, so
I decided to bring some new storage online. I was building a new
MythTV frontend only box so I placed the disk in that machine and
allowed it to be mounted only my the mythbackend server using NFS. It
works fine, but it seems that possibly during mythcommflag jobs the
backend server is going offline without any warning and without any
interesting messages in the backend log file. I see only stuff like
this:

2005-07-31 19:39:22.294 adding: myth14 as a client (events: 0)
2005-07-31 19:39:22.302 adding: myth14 as a remote file transfer
2005-07-31 19:39:31.060 adding: myth14 as a client (events: 0)
2005-07-31 19:39:31.067 adding: myth14 as a remote file transfer
Session management error: Could not open network socket
2005-07-31 22:00:43.061 New DB connection, total: 1
2005-07-31 22:00:43.089 New DB connection, total: 2
2005-07-31 22:00:43.116 Using protocol version 15
2005-07-31 22:00:43.122 adding: dragonfly as a client (events: 0)
2005-07-31 22:03:08.546 adding: myth12 as a client (events: 0)
2005-07-31 22:03:08.995 adding: myth12 as a client (events: 1)
2005-07-31 22:10:38.808 adding: dragonfly as a client (events: 1)
2005-07-31 22:55:13.915 Event socket closed. No connection to the backend.
[mpeg2video @ 0xb78fe810]ac-tex damaged at 23 16
[mpeg2video @ 0xb78fe810]Warning MVs not available

2005-08-01 06:36:29.248 New DB connection, total: 1
Starting up as the master server.
2005-08-01 06:36:29.303 New DB connection, total: 2
2005-08-01 06:36:29.371 New DB connection, total: 3
2005-08-01 06:36:30.144 New DB scheduler connection
2005-08-01 06:36:30.150 mythbackend version: 0.18.1.20050510-1 www.mythtv.org
2005-08-01 06:36:30.177 Enabled verbose msgs :important
2005-08-01 06:36:32.566 Seem to be woken up by USER
2005-08-01 06:36:40.190 New DB connection, total: 4
2005-08-01 06:36:40.335 New DB connection, total: 1
2005-08-01 06:36:40.775 New DB connection, total: 2
2005-08-01 06:36:40.972 Using protocol version 15
2005-08-01 06:36:40.978 adding: dragonfly as a client (events: 0)
2005-08-01 06:36:44.267 adding: dragonfly as a client (events: 0)
2005-08-01 06:36:44.314 adding: dragonfly as a client (events: 1)
2005-08-01 06:38:22.758 unknown socket
2005-08-01 12:00:37.568 New DB connection, total: 1
2005-08-01 12:00:37.585 New DB connection, total: 2
2005-08-01 12:00:37.600 Using protocol version 15

I don't have a clue what's going on here. Every time I've tested the
/video partition from the mythbackend server it's been working fine. I
don't seem to be able to make the connection fail but then in the
middle of the day or the middle of the night, when there isn't
anything going on I'll attempt to use a frontend box and find that the
backend is no longer running.

This is Gentoo, 2.6.12-gentoo-r6 on both the server and the remote NFS
machine. The NFS mount is using tcp and 8K packets as verified by
ethereal on the mythbackend machine.

Help! :-(

Thanks,
Mark