Lisa: It is based on the disk/disk groups. You just need to give /dev/(r)dsk paths to ASM and ASM will take care the rest. It is like managing a JBOD for oracle datafiles. It can also do 2way or 3way mirroring. I have experimented ASM some time back and it works as advertised. But I don't have ANY production customers using ASM. So I would excercise caution! KG ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------