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Disk I/O Tuning

Chapter 3: ATA Tuning in LINUX

  • claim to support multiple mode, but lose data at some settings.  Under rare circumstances, such failures can result in massive file system corruption.
     

  • -M

    - Get/set Automatic Acoustic Management (AAM) setting.  Most modern disk drives have the ability to speed down the head movements to reduce their noise output.  The possible values are between 0 and 254.  The quietest setting is 128 (and therefore slowest) and 254 is the fastest (and loudest).  Some drives have only two levels (quiet/fast), while others may have different levels between 128 and 254.  THIS FEATURE IS EXPERIMENTAL AND NOT WELL TESTED.  USE AT YOUR OWN RISK.  The faster the head, the better the performance at a cost of a noisier drive.
     
  • -p

    - Attempt to reprogram the IDE interface chipset for the specified PIO mode, or attempt to auto-tune for the "best" PIO mode supported by the drive.  This feature is supported in the kernel for only a few "known" chipsets, and even then, the support is iffy at best.  Some IDE chipsets are unable to alter the PIO mode for a single drive, in which case this flag may cause the PIO mode for both drives to be set.  Many IDE chipsets support either fewer or more than the standard six (0 to 5) PIO modes, so the exact speed setting that is actually implemented will vary by chipset/driver sophistication.  Use with extreme caution!  This feature includes zero protection for the unwary, and an unsuccessful outcome may result in severe file system corruption!
     
  • -P

    - Set the maximum sector count for the drive's internal pre-fetch mechanism.  Not all drives support this feature.


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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