[mythtv-users] Network storage fault tolerance (was Re: Myth autoexpiring brand new shows)
Henk Schoneveld
belcampo at zonnet.nl
Wed Aug 27 07:36:34 UTC 2008
Michael T. Dean wrote:
> On 08/26/2008 06:40 PM, David Brodbeck wrote:
>
>> Michael T. Dean wrote:
>>
>>
>>> Speaking of which, does anyone know of a way to make NFS tolerant of the
>>> NFS server's going down so that it will automatically unmount/remount
>>> the filesystems?
>>>
>>>
>> Technically NFS is stateless -- if a server goes down, I/O requests on
>> that filesystem just hang until it comes back.
>>
>
> For me the hanging part works, but the "until it comes back," doesn't
> when there's a reboot of the server involved. When the server comes
> back, it continues to hang. I have to unmount (which gives errors
> because the server "isn't there"--even if it is). Then, eventually, I
> just remount, and it works (though sometimes it seems to show multiple
> connections in the nfs *tab files).
>
>
>> No need to remount.
>> This usually isn't what people want, though, because it leads to lots of
>> applications sitting around in unkillable D states.
>>
>
> I'm mounting with:
>
> rw,_netdev,rsize=8192,wsize=8192,hard,intr,actimeo=0
>
Try leaving out the rsize wsize things and watch what server/client
negotiate on optimal size. Check with less /proc/mounts. If playing from
nfs did have stuttering problems they probably are gone.
> (from http://mythtv.org/docs/mythtv-HOWTO-23.html#ss23.10 , but with
> nfsvers=3 removed as it's not required on my systems). But, after doing
> some more reading on nfs.sf.net, I switched it to use nfs4 (rather than
> 3) because it's supposed to be more reboot tolerant. Can't test while
> the backend is recording, but if it works, I'll try to remember to post
> the results.
>
> Mike
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