BUD

A BUD is non-volatile memory in which the firmware of an ETERNUS DX is registered. A BUD is used as an area to back up cache data in the system memory if a power failure occurs.

If the system memory capacity for each controller is 512GB or less, the BUD (BUD1) for small cache capacities is installed.

If the system memory capacity for each controller exceeds 512GB, the BUD (BUD2) for large cache capacities is installed.

The number of BUDs installed for each controller is two.

If the BUD fails, the failed BUD can be replaced while the system is running.