2-18 Setting Up The DAU
Scheduled Stop Procedure
Perform the following procedure to be absolutely sure that cache data has been
completely written to disk before you power off the DAU.
1. Power off the host system.
The host writes cache data to the disk array unit.
2. Press and hold the CACHE FLUSH pushbutton (scheduled stop switch)
located on the SVP Service Processor until the CFL LED flashes or is
continuously lit (for at least two seconds). See Figure 1-12 for the location
of the CACHE FLUSH pushbutton and the CFL LED.
3. Release the CACHE FLUSH pushbutton when the CFL LED starts to flash
or is continuously lit. The CFL LED continually flashes as data is being
transferred from the cache to the disk.
4. Before turning off the disk array unit, make sure that the CFL LED is
continuously lit. Once the CFL LED is continually lit, the cache flush
operation has completed.
5. Power off the DAU.
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