We have an Intel based server with dual 3.0 gigahertz (GHz) processors and plenty of RAM (2 GB+). When the Oracle Instance is brought up, it takes 14 times longer with Veritas Volume Manager.
The EMC Array is not seeing any performance hits, nor is the SAN. I suspect that Veritas Volume Manager is adding overhead to the disks when accessed.The disks are mirrored at the EMC array level and concatenated at the Veritas Volume Manger level. The server is patched to the latest Volume Manager level, as is the OS. The HBAs are set to automap the LUNs for the EMC array.
You may need more time to start the volume manager, read the volume information off the disks, etc., but I don't believe it should be anywhere near this much time difference.
Again, open a support call with the Veritas team.
This was first published in March 2005