Megaraid Level5 Freaks after ShutDown

XServe G5 Dual 2.3 GHz, OS 10.4.9, 2 Gb RAM. In use since 2005. Apple PCI RAID card. Used megaraid command to configure Logical Drive 0 = 15 Gb Raid Level 5 containing boot volume, and Logical Drive 1 = 140 Gb Raid Level 5 containing seven (7) volumes of 20 Gb each for employee file storage. For about the past six months after shutdown (but NOT after just a restart), system boots and auto-logsin as Admin (which is how we want it), but desktop only shows the Boot Volume (from Logical Drive 0) and just ONE of the seven storage volumes from Logical Drive 1 (which actually appears as a folder, not as a hard drive, and it has the lock icon showing). I have to logout/login (still as Admin) to get the desktop to appear correctly (i.e., showing eight mounted drives in all). Remote administration, network AFP file access, etc, all seem OK during the freaked-out desktop display but, natch, local access (at the XServe itself) is curtailed until the logout/login routine is performed. Any ideas?