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Conference vmsdev::vmstuning

Title:VMSTUNING
Notice:Welcome to VMSTUNING
Moderator:EVMS::HALLYB
Created:Sat Feb 15 1986
Last Modified:Wed May 14 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1539
Total number of notes:7984

1531.0. "Window Turns Excessive on System Disk" by CHEFS::LONG_J () Fri Feb 21 1997 06:24

    
        I am running VMS 6.2 on a three node cluster.
    
        I am looking at the performance and have a few disks with high window
        turns, some of which can be set using the maxfile size / 65000 to
        determine what the setting should be.
    
        However, the system disk is registering as having high window turns
        when it is running images that are installed.  The maxfile size /
        65000 does not produce a number greater than 7 but the window turns are
        hitting 60 and above.
    
        Is there any danger in me setting the window turns to 60 on this
        occassion or is there something esle I can do to rectify this.
        
        The systems are running DFG and the system disk is not overly
        fragmented.  I have searched the disk using DFG for files with
    	greater than 7 extents and there aren't any.
    
        Any further info on this would be appreciated.
    
    
    
        Regards
        Jackie Long
    	FM Newbury
    
    
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1531.1no problemsCSC32::BUCKLEYski fast,take chances,die youngThu Feb 27 1997 08:407
there is no danger in raising the number of windows on the disk to 60, it just
uses more memory for the disk window buffer. It may be an indication that you
have fragmented files that cannot be defraged (setfilenomove.com) or that you
need to convert indexed files on the disk...

Raising the window buffer "hides" the fact that there may be underlying problems
on the disk.