[mythtv-users] Some master/slave backend advise required

[Johan Van der Kolk]

On 03 Jun 2014, at 06:16, Jean-Yves Avenard <jyavenard at gmail.com> wrote:

> On 3 June 2014 08:56, Johan Van der Kolk <johan.vanderkolk at gmail.com> wrote:
> 
> 
>> My aim was to keep all the data on the master backend, which also has the
>> 7TB ZFS Zraid2-0, (raw 12TB in 6 disks) and use that processor for the SQL
>> database, master backend comflagging and some other services. Using the
>> slave backend only to process and push the data up to master backend with
>> the ZFS storage pool. That does not seem to be a recommended option.
> 
> don't have your database running on the same ZFS array as where you
> are keeping your recordings.
> That alone is probably what is giving you most issues.
> 
The database is running on SSD, the ZFS is purely used for video and audio content.

> Use ZFS if you wish, but keep the disks separated. A SSD would be best.
> 
> use a ZFS mirror array for your SSD if you are paranoid (IMHO a single
> SSD and regular backup of the database to the RAIDZ2 array is more
> than enough)
> 
>> 
>> Infiniband looks attractive from performance perspective, but I have no idea
>> about cable pricing. I need to cover a distance of about 50 meters with lots
>> of bends.
> it's going to set you for thousands...
> 
>> 
>> From the comments I received so far, it looks like if i have to throw $$$ at
>> the problem, it is best spent on a powerful slave backend with plenty
>> processing power and local storage. I just miss the fault tolerance, unless
>> I just use plain raid mirror.
>> Just afraid to drop that system in the garden shed…although it may be the
>> safest location for a server, who would steal a server if he can take the
>> lawnmower :-)
> 
> how hot does it get in your area?
It’s Belgium, so we’re excited if it gets above 21 C ;-) And the shed does not get hot, it’s stone.
> 
> in my shed, I would regularly see temperature in excess of 50C, that's
> pretty bad for any hard drives
> 
> no way I would store a server there
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