[mythtv-users] Missing SBE locks/hangs MBE???

Michael Watson michael at thewatsonfamily.id.au
Sat Feb 9 21:54:16 UTC 2013


On 10/02/2013 2:42 AM, Michael T. Dean wrote:
> On 02/08/2013 05:12 PM, Michael Watson wrote:
>> On 9/02/2013 5:18 AM, Jonathan Larson wrote:
>>>
>>> Hello All,
>>>
>>> I’ve got 5 SBEs that stay on 24/7 normally. They all connect to a 
>>> tuner-less (except for a dummy tuner) MBE virtual machine. 
>>> Yesterday, one of the SBE’s had a hardware failure and stopped 
>>> responding. Shortly afterwards the MBE stopped responding via its 
>>> status port or mythweb. And shortly after that the other SBEs also 
>>> gave up because they couldn’t contact the MBE. Basically, a single 
>>> hardware issue on 
>
>>> 1 SBE brought down the whole system.
>>>
>>> The storage for recordings is all on the SBEs—2 disks each, defined 
>>> in the storage groups setup on the MBE. The SBE’s are also 
>>> cross-mounted via NFS, and they mount a NFS share on the MBE for 
>>> access to the post-processing user scripts. All those mounts are 
>>> controlled via autofs, which uses the following options: 
>>> -rw,noatime,nodiratime,soft,nfsvers=3
>>>
>>> I’d really appreciate any advice on how to troubleshoot this cascade 
>
>>> failure. I really want to be able to bring down a SBE without an 
>>> adverse effects to the rest of the system. I wonder if this could be 
>>> caused by the cross mounting of the storage directories via NFS, and 
>>> if so, are there any NFS mount/share options that I could use to 
>>> make them fail gracefully—maybe a shorter timeout period?
>>>
>>> Any help would be appreciated.
>>>
>>>
>> Yep, I had the same problems when I had my storage distributed on 
>> SBE's (and mounted by NFS). Your only options are to centralize your 
>> storage on the MBE (or a NAS Device), or not mount them via NFS.
>
> FWIW, I'm using the latter option--not using NFS.  I have storage on 
> the master backend, which is only visible to/usable by the master 
> backend, and storage on the remote backend, which is only visible 
> to/usable by the remote backend.  I've never had an issue.
What happens when the SBE is asleep?  You cant watch a recording that is 
stored on the SBE (obviously), but Myth does not handle it very well (or 
doesnt handle it at all), you simply cant watch the recording unless you 
manually power up the SBE.  Ideally in this scenario the MBE would wake 
the SBE, and advise the user of what is happening.
>
> I used to use NFS on a system I help a friend maintain, and it did 
> have lots of problems with NFS when the NFS server disappeared. 
> Because of that--and my desire for reliability--we reorganized the 
> system so the NFS wasn't required (and are using MythTV streaming for 
> recordings and Video Library videos).

You still need to mount Pictures and Music locations if you want to be 
able to access these from remote FE/SBE (or synchronize this data 
amongst the relevant machines somehow).

>
> Mike
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