Running out of disk space on MySQL partition azure

I created replication in Microsoft Azure Virtual Machine .

I'm using MySQL and working with sql workbench (windows).

yesterday I discovered that my 250 GB storage are full and replication stopped.

this log wrote,

 Timestamp, Thread, Type, Details
2015-07-29 23:26:44, 1672, Warning, Disk is full writing '.\database123-relay-bin.000164' (Errcode: 28 - No space left on device). Waiting for someone to free space...

and I created another 250 GB external storage.

I have 2 Q :

1. how can I create queries and use data within two difference storage ?

2. is it the right thing to do? to create another storage or there is a way to create flexible storage

   ?

that i found is this : http://ift.tt/1HnO64W

but it not help , need help and Guidance