[Gluster-users] how well will this work

[Joe Julian]

On 12/30/2012 12:31 PM, William Muriithi wrote:
>>>> For mysql, I set up my innodb store to use 4 files (I don't do 1 file
>>>> per table), each file distributes to each of the 4 replica subvolumes.
>>>> This balances the load pretty nicely.
>> It's not so much a "how glusterfs works" question as much as it is a how
>> innodb works question. By configuring the innodb_data_file_path to start
>> with a multiple of your bricks (and carefully choosing some filenames to
>> ensure they're distributed evenly), records seem to be (and I only have
>> tested this through actual use and have no idea if this is how it's
>> supposed to work) accessed evenly over the distribute set.
>>
> Hmm, have you checked on the gluster servers that these four files are
> in separate bricks?  As far as I understand, if you have not done
> anything Glusterfs scheduler (Default ALU on version 3.3), it is
> likely that is not whats happening. Or you are using a version that
> has a different scheduler.  Interesting though.  Poke around and
> update us please
Not just checked, but engineered. At the time I created a file then 
checked which dht subvolume it was on using "getfattr -n 
trusted.glusterfs.pathinfo $file" for each file, then incremented the 
filename until it was created on the subvolume I wanted.

As an aside, I'm referring to DHT (distrubute) /subvolumes/ rather than 
bricks because AFR (replicate) is under DHT meaning that replicate 
actually is the translator whose subvolumes map 1:1 to bricks in my setup.
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