ITEM: BP8269L

How to set the block size of tape drive larger

Question:

Env:
  AIX 4.2
  RISC J30
  Atape.driver 2.5.2.2
  Tape 3590-B11

Desc:
  Customer wants to increase the block size of the 
  3590 to be over 1mb.  It would not like him since
  his DMA on the scsi is set to low.  

Action:
  You can only change the DMA this way:
  smitty devices
    SCSI Adapter 
       Change / Show Characteristics of a SCSI Adapter
          (choose one of the ascsi\# devices)

  SCSI Adapter          ascsi1
  Description          Wide SCSI I/O Controller Adapter
  Status                                  Available
  Location                                00-07
  Internal bus SCSI ID                    7
  External bus SCSI ID                   [7] 
  External bus wide enabled              yes 
  Internal bus wide enabled              yes    
  Maximum synchronous data transfer rate (mHz)   10  
  Target mode bus memory length              [0x10000]
  DMA bus memory LENGTH                      [0x300000] 
  BATTERY backed adapter                     no 
  Apply change to DATABASE only              no 

Change the DMA to be 0x300000 
Change Apply change to DATABASE only = yes

You will have to reboot to make these changes take effect.
Now the customer can set the block size to 1mb

Next Action:
  Closing with customer approval



Support Line: How to set the block size of tape drive larger ITEM: BP8269L

Dated: October 1996 Category: N/A

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