We recently discovered an issue that will only occur under very specific conditions. We felt that given the fact that there is a potential for data corruption, we would highlight this KB article here.
All of these conditions must be met to be affected:
- Systems with ESX/ESXi 4.0 installed
- The system is equipped with a RAID controller using one of these drivers:
megaraid2
megaraid_sas
aacraid - RAID controller battery backup unit is completely discharged after a shutdown (48 hours or longer)
- Local disks are attached to the affected HBA
Data corruption might occur because the RAID controller cache is not cleared while shutting down the server and will be lost when the battery backup is depleted.
Note that our team is working on a permanent solution to this issue.
Continue reading System does not clear RAID controller cache during shutdown
