H164360:  CORRECT CONCURRENT DRIVE SPIN-UP ON POWER-UP SETTINGS


 TEXT:

 When more than 6 drives are configured for Concurrent
 spin-up on power-up, the RAID drives may appear DDD
 then / or the System may shut down after the System has
 first powered up.

 The maximum number of ServeRAID or ServeRAID II attached
 hard drives supported for spin-up on power-up is 6. The
 default setting on these Adapters / Controllers is 6 but
 results in a maximum of 2 drives per SCSI channel spinning
 up at power up of the System.

 The following procedure will identify the number of drives
 configured for spin-up on power-up by the Adapter/Controller:

 1. Boot to the "IBM ServeRAID and ServeRAID II Configuration
    Diskette"

 2. Choose Option 7 "Advanced Features"

 3. Choose Option 8 "Display/Change Adapter Parameters"

 4. Choose Option 3 "Change Adapter Host/SCSI ID"

 5. look at "Concurrent Drives(0-15)" This should be set to 6 or
    less.  The default is 6.

 DETAILS:

 Configuring a ServeRAID or ServeRAID II Adapter / Controller to
 spin-up more than 6 drives on power-up of the System can result
 in some drives not completing spin-up (resulting in those drives
 in a DDD state) and / or the System power supply to shut off
 (resulting in the System powering off). This is caused by the
 combined power requirement of the System AND spin-up on power-up
 of MORE than 6 hard drives, which exceeds the power available
 from the System power supply.

Date: August 10, 1998