[mythtv-users] NFS woes
thomaswright at cantab.net
Wed Dec 6 20:11:30 UTC 2006
I'm having real trouble with serving video files over NFS, and desperation is
now setting in. Here's the setup:
I have one diskless machine (bragi) booting over PXE, mounting its root
filesystem by NFS and then mounting the video partition also over NFS.
The disks are all in my server (thor), where I have a RAID5 array formatted as
ext3 which contains the root filesystem which bragi boots from. It also has
a single disk on the same RAID controller for storing videos which is
formatted with JFS. Both are exported from the NFS kernel server on thor.
Both shares are exported with rw,no_root_squash,async
Mount options on bragi are rw,hard,intr,rsize=32768,wsize=32768,nfsvers=3,tcp
bragi has a SysKonnect Yukon 2 network card, but I'm aware of the problem with
tcp segmentation offload so have added this line to the init scripts:
ethtool -K eth0 tso off
The two computers are connected through a gigabit switch.
The problem is that the server (thor) hangs completely - it won't even respond
to ping - at random intervals. I can also force it to crash by playing a
recording and fast-forwarding really fast (say at 30x play speed).
As soon as thor crashes, bragi runs into trouble - it carries on until it
needs disk access, then (as its entire OS is loaded from thor) it can go no
I really need thor to be stable, as all the other computers rely on it for one
thing or another so this is a major pain.
Please, can somebody help? I'm happy to provide more information or run
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