1) Welcome to the Party!

2) As you are obviously new here, I have some suggestions to help us all help you:
When you post, please post your entire configuration including (but not limited to) your installation method (7.X.X?) and vicidial version with build (VERSION: 2.X-XXXx ... BUILD: #####-####).
This IS a requirement for posting along with reading the stickies (at the top of each forum) and the manager's manual (available on EFLO.net, both free and paid versions)
You should also post: Asterisk version, telephony hardware (model number is helpful here), cluster information if you have one, and whether any other software is installed in the box. If your installation method is "manual/from scratch" you must post your operating system with version (and the .iso version from which you installed your original operating system) plus a link to the installation instructions you used. If your installation is "Hosted" list the site name of the host.
If this is a "Cloud" or "Virtual" server, please note the technology involved along with the version of that techology (ie: VMware Server Version 2.0.2). If it is not, merely stating the Motherboard model # and CPU would be helpful.
Similar to This:
Vicibox X.X from .iso | Vicidial X.X.X-XXX Build XXXXXX-XXXX | Asterisk X.X.X | Single Server | No Digium/Sangoma Hardware | No Extra Software After Installation | Intel DG35EC | Core2Quad Q6600
3) As blackbird2306 pointed out, that's a temp folder and need not be altered. Each server will get one, and only recordings for calls presently in progress are stored there. As soon as the calls complete they will be moved to their home on that dialer.
4) Be sure you look into the AST_CRON_audio_3_ftp.pl option in your crontab -e. This will allow you to push ALL your recordings (from all servers in your cluster) into an FTP server that can permanently store them AND provide them to users seamlessly. The script will update the URL for the recordings in the system so all vicidial recording links can pull from the Web server of that FTP location. Properly configured it means your dialers have NO need to store recordings long-term.
Also worthy of note: each dialer stores these recordings in a single MP3 folder. Eventually that folder will be impossible to navigate (ll ans ls -l will fail) due to hundreds of thousands of files. However: the FTP transfer process will create a folder for each day and the navigation problem is solved.
Solves the "huge HD on each dialer" problem. Solves the "my dialer died and I have to replace it, but what about those recordings?" problem as well. Dialers are now disposable because they store NO data. So you back up your DB (/usr/share/astguiclient/ADMIN_backup.pl) and you mirror your FTP server and you have catastrophic failure protection.