aio_prio_delta_max.5 (2010 09)

a
aio_prio_delta_max(5) aio_prio_delta_max(5)
(Tunable Kernel Parameters)
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 parame-
ter 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://www.hp.com/go/hpux-core-docs
.
AUTHOR
aio_prio_delta_max
was developed by HP.
SEE ALSO
kctune(1M), sam(1M), gettune(2), settune(2), aio(5).
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1