Acer PCI to Ultra SCSI RAID Controllers DAC960PG - Manual (Page 49)

Error Messages
Manual No. 775012 C-3
NVRAM Error
With Firmware 4.x, if the BIOS displays a mismatch between the NVRAM
and the COD, no drives will be installed. Normally this error will not be
displayed. If it is, boot and run the on-board Mylex Disk Array
Configuration Utility (see Chapter 4) to recover from the error. For more
information, refer to the RAID EzAssist Configuration Utility User Reference
Guide, available on CD-ROM, or RAID EzAssist Configuration Utility Quick
Configuration Guide.
System Reboot or Power Down Messages
Status messages may also be available from LED indicators connected to the
DAC960PG/PJ. The Write Pending indicator is especially important when
preparing to power-down the system.
The DAC960PG/PJ is a caching controller with up to 128 MB of cache
memory, data may still be in the cache waiting to be written to the disk
drives, when the system reports that a write command was completed. It is
very important to make sure that all data is written to the disk before
rebooting or powering down the system, or you may lose data. It is always a
good idea to wait for 15 seconds before resetting or rebooting the system.
If using the 'Write Pending' LED indicator, wait three seconds after the LED
has gone off before resetting or rebooting the system (the optional cache
battery backup may also be used to prevent data loss).