I have serios problem for up of instance of Informix Online in HPUX 11i

At running oninit -ivy generated in the bitacora of following errors:

Informix Dynamic Server Version 7.30.UC6 Softwar

Can't open /dev/async. KAIO disabled
Can't open /dev/async. KAIO disabled
Can't open /dev/async. KAIO disabled
Assert Failed: kaiothread() ERROR
Informix Dynamic Server Version 7.30.UC6
Who: Session(1, informix@crrssv01, 0, 0)
Thread(14, kaio, 0, 1)
File: kaio.c Line: 2048
stack trace for pid 25464 written to /tmp/af.e9877
Assert Failed: kaiothread() ERROR
Informix Dynamic Server Version 7.30.UC6
Who: Session(0, @, 0, 0)
Thread(12, kaio, 0, 6)
File: kaio.c Line: 2048
stack trace for pid 25469 written to /tmp/af.c9877
Assert Failed: kaiothread() ERROR

Thanks for your help.