HP OpenVMS Systems

HSZ Maximum Transfer Size? (HSZ Cache)

» close window

The Question is:

 
I need to find out the MAXIMUM_TRANSFER_SIZE no our HSZ controllers.
What am I supposed to do?
I need this in order to tune a database.
 
Thanks a lot,
Armand
 

The Answer is :

 
  Please contact the database vendor for assistance and suggestions
  with tuning the database configuration -- the transfer size caching
  is less a question that can be answered in isolation than a question
  of coordination of the configuration the HSZ controller and of the
  host application software I/O patterns.
 
  The HSZ documentation describes how to set up the maximum transfer
  size to be cached within the controller, and the HSZ series devices
  are capable of handling and caching rather larger kilobyte transfers.
  If you set the maximum transfer size too small, the HSZ controller
  will perform write-through operations and will not cache the data.
 
  The VTDPY utility can provide you with the average I/O size generated
  by the host application.  You will also want to evaluate the cache hit
  rate, and the queue depth.
 

  

     

     
answer written or last revised on ( 23-MAR-2001 )
     
» close window