i suggest a look at digium's hardware compatibility list on thier website. i would also worry about concurrent calls & thus concurrent recordings, 48 with your actual card which i guess is acceptable load to your hardware but i am not an expert in this.
recording to disk (even scsi ones) will make your server unstable when lots of calls are being recorded, then your option is to record to RAM (or go for OrecX). then empty RAM to disk when load is low since you've got plenty of RAM. gsm conversion will lower the size of wav recordings by 10.
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