IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

CORRECT CONCURRENT DRIVE SPIN-UP on POWER-UP SETTINGS

     Record number:       H164360
     Device:              D/T8640
     Model:               M
     Hit count:           UHC00000
     Success count:       USC0000
     Publication code:    PC50
     Tip key:             027
     Date created:        O98/06/03
     Date last altered:   A98/06/03
     Owning B.U.:         USA

Abstract: 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.

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