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HP-UX Reference > Hhfs_revra_per_disk(5)Tunable Kernel ParametersHP-UX 11i Version 2: December 2007 Update |
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NAMEhfs_revra_per_disk — maximum HFS file system blocks to be read in one read-ahead operation when sequentially reading backwards DESCRIPTIONThis tunable defines the maximum number of file system blocks to be read in one read-ahead operation when sequentially reading backwards. When Should the Value of This Tunable Be Raised?The value of this tunable should be increased if there is a large number of reverse sequential file I/O on file systems with small file system block size. What Are the Side Effects of Raising the Value?The system will consume more memory in the buffer cache. WARNINGSAll HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX. Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tunable values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see HP-UX Release Notes at http://docs.hp.com. |
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