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Disk I/O Tuning

Chapter 3: ATA Tuning in LINUX

  • -i

    - Display the identification info that was obtained from the drive at boot time, if available.  This is a feature of modern IDE drives and may not be supported by older devices.  The data returned may or may not be current, depending on activity since booting the system.  However, the current multiple sector mode count is always shown.  For a more detailed interpretation of the identification info, refer to ATA attachment Interface for Disk Drives (ANSI ASC X3T9.2 working draft, revision 4a, April 19/93).
     
  • -I

    - Request identification info directly from the drive, which is displayed in a new expanded format with considerably more detail than with the older -i flag.  There is a special "no seatbelts" variation on this option,

    -Istdin,

    which cannot be combined with any other options, and which accepts a drive identification block as standard input instead of using a /dev/hd* parameter.  The format of this block must be exactly the same as that found in the /proc/ide/*/hd*/identify "files".  This variation is designed for use with "libraries" of drive identification information and can also be used on ATAPI drives, which may give media errors with the standard mechanism.
     
  • -k

    - Get/set the keep_settings_over_reset flag for the drive.  When this flag is set, the driver will preserve the -dmu options over a soft reset, as done during the error recovery sequence.  This flag defaults to off, to prevent drive reset loops, which could be caused by combinations of -dmu settings.  The -k flag should therefore only be set after one has achieved confidence in correct system operation
     


The above text is an excerpt from:

Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle Databases

ISBN

0-9745993-4-4 

by Mike Ault
 


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