My customer want to use linux as database server, maybe oracle9206+rhel3 But i'm wonder which is the most popular cluster software in linux box? I found a Linux HA project at this web site: http://www.linux-ha.org/ the product is heartbeat. I dont want to use RAC, all I want is a cluster can monitor the resource and switch to another server when the primary server is cracked. just like the sun cluster or the veritas cluster. Any help really appreciated. -- Kamus <kamusis@xxxxxxxxx> A Oracle8i & 9i Certified DBA from China -- //www.freelists.org/webpage/oracle-l