How to move caches directory

Hi everyone

I'm setting up a production TeamCity farm with 12 build agents, and am following the advice in this blog post on best practice for TeamCity performance.  In summary, the recommendation is to move the TeamCity Data Directory to a separate disk from the OS disk, particularly the artefacts and messages directories.  

I have managed to move the TeamCity Data Directory to a new location as recommended and documented, but am now trying to move the caches directory within the Data Directory to a location on the OS disk.  The performance blog post states (emphasis mine):

Given that, the following setup seems reasonable: use a large disk for the whole

.BuildServer

except

caches

directory and another medium size disk for

caches

and

temp

. If you really need faster access to artifacts, you can further separate

artifacts

and

messages

directories.

I can see a location set for the caches directory in the Global Settings page, but cannot find any way to change it, nor any documentation explaining how to do so.  

Is this actually a supported configuration change, and if so, how do I make it?

Many thanks in advance

Alastair