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aio_prio_delta_max(5)

Tunable Kernel Parameters
HP-UX 11i Version 3: February 2007
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NAME

aio_prio_delta_max — greatest delta (slowdown factor) allowed in POSIX async IO request priorities

VALUES

Failsafe

20

Default

20

Allowed values

The minimum value allowed is 0. The maximum value allowed is 20.

Specify a positive integer value.

DESCRIPTION

This parameter places a limit on how much the priority of a POSIX asynchronous I/O operation can be reduced to slow it down. This is the maximum priority-offset value allowed for aio_reqprio in the asynchronous-I/O control block structure aiocb.

Who Is Expected to Change This Tunable?

System administrators that run applications requiring heavy usage of POSIX AIO to file systems.

Restrictions on Changing

This tunable is dynamic (tuning will take effect immediately on the running system).

What Other Tunables Should Be Changed at the Same Time as This One?

None.

WARNINGS

All 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.

AUTHOR

aio_prio_delta_max was developed by HP.

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