ram drive

[Timothy D McKernan <tdm4(at)dyrectmedia(dot)com>]

My client would like to test using a ram drive to hold some of our 
postgre files.  Does anybody have any suggestions for how to go about 
doing this?  Details are below:

http://www.3dretreat.com/reviews/rocketdrive/

This is a review that explains the benefits of a ram drive: it's a pci 
card that holds several sticks of SDRAM, but reports it as another 
filesystem to linux.  So the idea is that we could put several postgre 
tables on this card, and we will hopefully see a huge performance 
increase by being able to access these files from the ram drive instead 
of a hard drive.

Our /usr/local/pgsql/data dir is nearly 4GB in size, but our current 
ramdrive only holds 2GB of ram, so we can't put the whole data dir on 
the ramdrive.

Which files would be ideal for loading onto the ram drive?  Are there 
specific files that contain the table indices?  This ram drive is 
nascent ground for us, so all ideas are welcome.

Thanks,
Tim


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