[mythtv-users] recording drive bottle neck suggestions..

John Drescher drescherjm at gmail.com
Mon Aug 31 22:44:15 UTC 2009


On Mon, Aug 31, 2009 at 6:39 PM, John Drescher<drescherjm at gmail.com> wrote:
> On Mon, Aug 31, 2009 at 6:35 PM,
> sonofzev at iinet.net.au<sonofzev at iinet.net.au> wrote:
>>
>>
>> On Tue Sep  1  8:00 , John Drescher  sent:
>>
>>>On Mon, Aug 31, 2009 at 5:49 PM,
>>>sonofzev at iinet.net.ausonofzev@iinet.net.au> wrote:
>>>>
>>>>
>>>> On Tue Sep  1  4:50 , Yeechang Lee  sent:
>>>>
>>>>>sonofzev at iinet.net.au sonofzev at iinet.net.au> says:
>>>>>> On Sunday night I ended up having a bottle neck as it was the first
>>>>>> time I ever had 5 recordings going at one (1 HD 4 SD)...
>>>>>
>>>>>Here's how I answered a similar question a few months back:
>>>>>
>>>>>http://www.gossamer-threads.com/lists/mythtv/users/369400#369400>
>>>>>(read the whole thread)
>>>>>
>>>>>--
>>>> Thanks to everyone who has responded to this.. I think I know what to do. but to
>>>> answer a couple of questions
>>>> 1. DVB-T tuners (1x dvico fusion lite.. 1 x dual express.. 3 tuners on 2 cards)
>>>> 2. DB is on OS drive while recording is elsewhere....
>>>>
>>>> BTW .. commflagging was definitely occuring as looking at the schedule there were
>>>> numerous shows starting and finishing .....
>>>>
>>>> My strategy will be
>>>>
>>>> Immediately
>>>> 1. schedule all jobs to after 1am ... there is very little recording happening
>>>> then... (i assume this includes commflagging when a window for jobs is set?)
>>>>
>>>> When I get a chance to migrate cases..
>>>>
>>>> 2.  add another 1 recording drive .. to start (I have a spare 200GB IDE )
>>>>
>>>> 3. load test -- see what the limits are..
>>>>
>>>> depending on load test I may add another drive for recording or add another drive
>>>> to the RAID for general storage...
>>>>
>>>> thanks again everyone. it's probably a few weeks before I get time to do this...
>>>> but will post my results
>>>>
>>>
>>>One linux software RAID optimization you can do is discussed in this
>>>thread (look at the second post):
>>>
>>>http://forums.gentoo.org/viewtopic-t-673067-highlight-raid5.html
>>>
>>
>>
>> Thanks mate.. I'll try this one as part of my first stage.... you just reminded
>> me to check if you've posted any updates to your overlay.. will do that tonight..
>> or maybe remotely from work.. cheers
>>
>>
> No mythtv updates in since July since I have been following JYA's patches.
>
> John
>

Actually. Please do not sync my overlay until I fix it . Apparently I
did a incorrect merge with another overlay and things are all messed
up. I will fix that asap.


-- 
John M. Drescher


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