How to Enable Asynchronous I/O Disk HP-UX 11.11

a) From the SAM Kernel configuration menu, choose Drivers and set 
the Pending State for asyncdisk to In. 

b) From the Actions Menu rebuild the Kernel 

c) At the Unix Prompt , execute the following statements as 'root'
# insf

you must have in your /dev

crw-rw-rw- 1 bin bin 101 0x000000 Jan 23 12:41 /dev/async
crw-rw-rw- 1 bin bin 101 0x000000 Jan 23 12:41 /dev/asyncdsk

if u don't have try:

#insf -e 

...simple not??

Another way is doing manually... not dificult... supose you are doing it for oracle:

1. cd /stand/build

2. /usr/lbin/sysadm/system_prep -s system

3. vi /stand/build/system - add the following 2 lines: asyncdsk & asyncdsk_included

4. mk_kernel -s /stand/build/system

5. cp /stand/system /stand/system.prev

6. cp /stand/build/system /stand

7. kmupdate /stand/build/vmunix_test

8. cd /

9. shutdown -r -y now

10. after the system is reboot..

11. Use sam to change the value of the parameter max_async_port from 50 -> 1024 (static, you need reboot)

12. check that the driver is installed: lsdev | grep 101

101 -1 asyncdsk pseudo


13. mknod /dev/async c 101 0x000000

14. chown oracle:dba /dev/async (the special are created with crw-rw-rw- so you don't need perform that... it's your choice...)

15. chmod 660 /dev/async

16. vi /etc/privgroup - add 1 line: 
dba MLOCK

17. run the command: setprivgrp -f /etc/privgroup

18. run the command: getprivgrp, and make sure that you can the following
output:

global prvileges: CHOWN
dba: MLOCK


19. make sure that the oracle team add the following parameter to the oracle
init files:

disk_asynch_io=true

Finaly you do rigth doing a little tests like...

*It's your driver reali loaded???
# kmadmin -k | grep async
asyncdsk_included
asyncdsk


*Are your privgroups directives correctly established a boot???

# grep /etc/privgroup /sbin/init.d/*
/sbin/init.d/set_prvgrp: if [ -f /etc/privgroup ]; then
/sbin/init.d/set_prvgrp: /usr/sbin/setprivgrp -f /etc/privgroup
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sangeethakumar

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