How could I recongnize file system using async mode?

[Lee Joon Moon]

Hello Everyone

I'm using HPUX 11.00 with vxfs.
But, I want to check to use async mode on vxfs system. I heard that vxfs uses async mode as default options. I'm sure this fuction.

If you know the method to check the options, Pleas let me know?

[Shaikh Imran]

Hi,
One way to check the aync i/o is from the kernel parameter async_io. The value of 1 indicates enable & 0 indicates disable.
You can try it with fstyp command ..
see man fstyp for details
Example:
# fstyp -v /dev/vg00/lvol1

Regards,

[Lee Joon Moon]

Thank you for your relay.

But, I'm used HPUX 11.00
I executed your advice, I got the answer.

hp:/]kmtune -q async_io
kmtune: Cannot identify parameter name async_io

Parameter "async_io" doesn't recongize by HPUX 111.00

Thank you.

[Dietmar Konermann · Accepted solution]

Folks,

there is no async_io tunable in HP-UX. There is a fs_async tunable, but that is only for HFS... not VxFS.

For VxFS you need to have a look at the mount options, e.g.:

# mount
...
/var on /dev/vg00/lvol8 delaylog,dev=40000008 on Wed Mar 10 13:40:09 2004

The different options are described in the mount_vxfs(1M) man page. "delaylog" is often used as a good compromise between speed and safety.

Best regards...
Dietmar.