What should a technician check first if a server halts after a cache battery replacement and indicates no logical disk volumes?

When a server halts after a cache battery replacement and indicates no logical disk volumes, the technician should first check the cache battery itself. This is crucial because the cache battery is responsible for maintaining the RAID cache memory during power loss. If the cache battery is improperly installed, defective, or incompatible, the RAID controller cannot access the cached data and may not be able to recognize or construct the logical disk volumes.

Furthermore, if the battery is failing or has not been sufficiently charged, it can lead to the server failing to read the metadata for the logical volumes configured on the disks. As a result, the server will halt and indicate that no logical disk volumes are available. This highlights the importance of ensuring that the new cache battery is working correctly and properly seated in its connector to allow the RAID controller to function as expected.

While aspects such as the BIOS boot order, controller cabling, and disk backplane are also important components of server operation, issues in those areas would typically not directly result from replacing the cache battery, making the cache battery the most pertinent first check in this scenario.