topic Asynchronous I/O in Operating System - HP-UX

Asynchronous I/O

Sid Bytheway — Thu, 08 Feb 2001 19:21:52 GMT

how do I enable asynchronous I/O on a VXFS logical volume? I have created filesystem on the volume and mounted.

Re: Asynchronous I/O

Jason VanDerMark — Thu, 08 Feb 2001 19:30:16 GMT

You can enable Async I/O by modifying the fs_async Kernel parameter. It is set to 0 (sync. I/O) by default. Change it to 1 and you should be in business. You can find this and lots of other great tuning tips in the HP-UX Kernel Tuning and Performance Guide which is available all over the net. Here is the link I found:

http://www.hp-partners.com/edaweb_public/html/technical_support/tuning.html

Hope that this helps.

Good Luck,
Jason V.

Re: Asynchronous I/O

Jitendra_1 — Thu, 08 Feb 2001 19:31:13 GMT

The kernel parameter fs_async ( a value of 1 ) will enable asynchronus I/O . But I believe its not only for one logical volume , it will affect all the logical volumes.