I have an odd issue. I have a p550 running 5.3 I have it lpared with a vio server and 4 clients. On my dbserver I attached a san and 3 vdisks. I created a vg, lv and fs for eaach san vdisk.
After I mounted the last file system and repbooted the hdisk numbering changed.
I had hdisk 0,1,2,3,4...