HP-UX 11i Release Notes (December 2000)

Process, Threads, Memory, and Kernel Parameters

Asynchronous Disk Pseudo Driver (async) Compatibility (new)

Chapter 8 163

Asynchronous Disk Pseudo Driver (async)

Compatibility (new)

The async driver is used mostly by databases for doing asynchronous I/O

to the disk.

Applications that use the async driver must be owned by the superuser,

or by a user who is a member of a group for which the privileges include

MLOCK.

To check a group’s privilege capabilities, issue this command:

/usr/bin/getprivgrp

group_name

If the output of getprivgrp does not show that the group has the MLOCK

privilege, set the group’s privilege by issuing this command as root:

/usr/bin/setprivgrp

<group_name>

MLOCK

Impact

If the application accessing async driver is not owned by superuser or by

a user who is a member of a group that has MLOCK privilege,

ASYNC_CONFIG and ASYNC_ADDSEG ioctl() will fail and errno will be

set to EPERM.

Compatibility

An application running on HP-UX 11.0 with patch PHKL_22126

installed will operate correctly when upgraded to 11i.

If the application using async driver was operating on a 11.0 system

without PHKL_22126, then the group associated with that application

must be modiﬁed to include the MLOCK privilege when migrating to

HP-UX 11i.