[Koha] Koha indexing - files

We are currently setting up a server and have a question about the location of the zebra indexes. Is /var/lib/koha/instancename/biblios/ the only place zebra keeps the index files it writes to during the indexing process? We are considering mounting the index files to a separate high-performance disk array in hopes of improving performance during the indexing process -- has anyone experimented with something like this? Thanks! -- Chad Roseburg Automation Dept. North Central Regional Library